
Avisynth Frequently Asked Questions
===================================

**Remark**: a more recent version can be found
`here <faq_sections.rst>`_ and at
`<http://avisynth.nl/index.php/Main_Page>`__

The faq is divided into four sections: a general section, one related to
frameserving, one related to filters and plugins, and one related to
importing VirtualDub filters. Recently, the old stuff "related to
AviSynth v2.06 and older versions" is removed. Thus, if you have
problems, make sure that you install a more recent version of AviSynth.


.. toctree::
    :maxdepth: 3

.. contents:: Table of contents



S1: About Avisynth
------------------

Q1.1: What is AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~

A: AviSynth (AVI SYNTHesizer) is a frameserver. An excellent discription
is given on `Lukes homepage <http://neuron2.net/LVG/avisynth.html>`__:

"AviSynth is a very useful utility created by Ben Rudiak-Gould. It
provides many options for joining and filtering videos. What makes
AviSynth unique is the fact that it is not a stand-alone program that
produces output files. Instead, AviSynth acts as the "middle man"
between your videos and video applications.

Basically, AviSynth works like this: First, you create a simple text
document with special commands, called a script. These commands make
references to one or more videos and the filters you wish to run on
them. Then, you run a video application, such as VirtualDub, and open
the script file. This is when AviSynth takes action.  It opens the
videos you referenced in the script, runs the specified filters, and
feeds the output to video application. The application, however, is not
aware that AviSynth is working in the background.  Instead, the
application thinks that it is directly opening a filtered AVI file that
resides on your hard drive.

There are five main reasons why you would want to use AviSynth:

#. Join Videos: AviSynth lets you join together any number of videos,
   including segmented AVIs. You can even selectively join certain
   portions of a video or dub soundtracks.
#. Filter Videos: Many video processing filters are built in to
   AviSynth. For example, filters for resizing, cropping, and sharpening
   your videos.
#. Break the 2 GB Barrier: AviSynth feeds a video to a program rather
   than letting the program directly open the video itself. Because of
   this, you can usually use AviSynth to open files larger than 2 GB in
   programs that don't natively support files of that size.
#. Open Unsupported Formats: AviSynth can open almost any type of video,
   including MPEGs and certain Quicktime MOVs. However, when AviSynth
   feeds video to a program, it looks just like a standard AVI to that
   program. This allows you to open certain video formats in programs
   that normally wouldn't support them.
#. Save Disk Space: AviSynth generates the video that it feeds to a
   program on the fly. Therefore, no temporary or intermediate videos
   are created. Because of this, you save disk space."

Q1.2: Who is developing AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

| A: AviSynth (up to v1.0b) is developed by Ben Rudiak-Gould, see
  `<http://math.berkeley.edu/~benrg/avisynth.html>`__. 
| Ben stopped developing and Edwin van Eggelen continued, see
  `<http://www.videotools.net/uk/download.php>`__.
| His latest release is version v1.0b6 which can be found on Edwins
  homepage given above.

Some versions appeared on the AviSynth forum, for example `v1.0b7a by
Divine <http://forum.doom9.org/showthread.php?s=&threadid=18243>`__ and
`v1.0b7d by
Dividee <http://forum.doom9.org/showthread.php?s=&threadid=18243>`__.

In the beginning of July 2002 there was a `second revision
(v2.0x) <http://sourceforge.net/projects/avisynth2/>`__ of the
sourceforge project.  (In the `first sourceforge
project <http://sourceforge.net/projects/avisynth/>`__ didn't happen
much.)

The most recent version is v2.5x series, weekly builds v2.5.0-2.5.5 by
leading developer Klaus Post were
`here <http://cultact-server.novi.dk/kpo/avisynth/avs_cvs.html>`__.

The main developer of AviSynth v2.5.6-2.5.7 is Ian Brabham (IanB). Many
other people contributed to AviSynth. For partial list see (play)
`Authors.avs <../../Examples/Authors.avs>`__ file. Official
`memberlist <http://sourceforge.net/project/memberlist.php?group_id=57023>`__
at sourceforge project:

| Alex\_e\_Basta aka alex\_e\_basta (doc writer)
| David Pierre aka bidoche (developer)
| Frank Skare aka dolemite1 (developer)
| Vincent TORRI aka doursse (developer)
| Alexander Balakhnin aka fizick (doc writer)
| Ian Brabham aka ianb1957 (developer, admin)
| Jonathan Ernst aka jernst (doc writer)
| kostarum (translator)
| Cedric PAILLOT aka macpaille (doc writer)
| Donald Graft aka neuron2 (project manager)
| Richard Berg aka richardberg (project manager)
| Klaus Post aka sh0dan (developer, admin)
| Andrew Dunstan aka squid\_80 (developer)
| Tonny S Petersen aka tsp42 (developer)
| Ernst Peche aka warpenterprises (doc writer)
| Wilbert Dijkhof aka wilbertd (project manager, doc writer).

AviSynth is free open source program distributed under GNU General
Public License as published by the Free Software Foundation.

Q1.3: Where can I download the latest versions of AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: See `Q1.2 <#q1-2-who-is-developing-avisynth>`__. It is also contained in the DVD2SVCD package
and on the download page of Doom (these might be not be the newest
versions of AviSynth).

Latest versions of AviSynth can now be downloaded at `sourceforge
page. <http://sourceforge.net/project/showfiles.php?group_id=57023>`__

Q1.4: What are the main bugs in these versions?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: The latest versions:

| v1.0b5: `Dissolve <corefilters/dissolve.rst>`__ doesn't work, BicubicResize doesn't work properly.
| v1.0b6: ?
| v1.0b7a/v1.0b7d: `Dissolve <corefilters/dissolve.rst>`__ doesn't work.
| v2.01: ?
| v2.02: `Layer <corefilters/layer.rst>`__ and `MergeChroma <corefilters/merge.rst>`__ don't work.
| v2.05: `Loop <corefilters/loop.rst>`__ doesn't work when loading a clip without sound.
| v2.07/v2.50: `SegmentedAviSource <corefilters/segmentedsource.rst>`__ doesn't load the avi's if the last empty segment isn't deleted.

| v2.50 beta
| v2.51 beta
| v2.52

| v2.58: `Known Issues 2.58 <http://avisynth.nl/index.php/Known_Issues_v2.58>`__.
| v2.6: `Known Issues 2.6 <http://avisynth.nl/index.php/Known_Issues>`__.

other bugs can be found in the documentation on the project page, see `Q1.5 <#q1-5-where-can-i-find-documentation-about-avisynth>`__.

Q1.5: Where can I find documentation about AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Documentation about the filters of AviSynth can be found on this
site `<http://avisynth.nl/index.php/Main_Page>`__, and also
on the `filters <corefilters.rst>`__ page. For a tutorial on avisynth
scripting, have a look at `this page <syntax.rst>`__. **You should read
these documents before posting to the forum** (but it's OK to post if
you have trouble understanding them).

Q1.6: How do I install/uninstall AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: In v2.05 or older versions: move avisynth.dll to your
system/system32 directory and run install.reg. Starting from v2.06
AviSynth comes with an auto installer. **Also make sure you have no
other versions of AviSynth floating around on your harddisc, because
there is a change that one of those versions will be registered. Remove
them if necessary.** For uninstalling AviSynth go to "program",
"AviSynth 2" and select "Uninstall AviSynth".

Q1.7: Is there any difference between v1.0x, v2.0x or v2.5x?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: The versions v1.0x and v2.0x are compatible (the main difference is
that v2.0x doesn't contain IPCSource, while it contains other filters
which are not present in v1.0x).  The main difference with v2.5x is that
the internal structure of AviSynth has changed (YV12 and multichannel
support) with the consequence that **external plugins compiled for v1.0x
or v2.0x will not work for v2.5x and vice versa**.

Q1.8: Are plugins compiled for v2.5x compatible with v1.0x/v2.0x and vice versa?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: As explained in `Q1.7 <#q1-7-is-there-any-difference-between-v1-0x-v2-0x-or-v2-5x>`__ that is not the case.  However it
is possible to use a v1.0x/v2.0x plugin in v2.5x, see `Q1.15 <#q1-15-how-do-i-use-a-plugin-compiled-for-v2-0x-in-v2-5x>`__.

Q1.9: Which encoding programs support YV12?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: There are several options for encoding to DivX/XviD:

#. There is a modified version (called VirtualdubMod) which has YV12
   support:  This modification (by pulco-citron, Suiryc and Belgador)
   has OGM and AVS-preview support.  It can be downloaded from
   `here <http://sourceforge.net/projects/virtualdubmod>`__.  In order
   to use the YV12 support (without doing any color conversions) you
   have to load your AVI in VirtualdubMod and select "**fast
   recompress**\ ".
#. VirtualDub support YV12 starting from v1.5.6.  In order to use the
   YV12 support (without doing any color conversions) you have to load
   your AVI in VirtualDub and select "**fast recompress**\ ".
#. For easy (and fast) YV12 support, you can also try out the new
   commandline compressor: AVS2AVI, see also `Q1.21 <#q1-21-i-got-the-message-loadplugin-unable-to-load-xxx-is-not-an-avisynth-1-0-avisynth-2-5-plugin>`__.


Q1.10: How do I use v2.5x if the encoding programs can't handle YV12 (like Virtualdub, TMPGEnc or CCE SP)?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Using Virtualdub you have to add
"`ConvertToYUY2 <corefilters/convert.rst>`__\ " to your script or you
have to install a YV12 decompressor like DivX5 or one of the recent XviD
builds of Koepi (`XviD-04112002-1 or
newer <http://roeder.goe.net/~koepi/xvid.shtml>`__).  Enabling "fast
recompress" implies that there will be a YV12 --> YUY2 --> YV12
conversion.  (DivX3/4 also supports YV12, except that PIV users could
experience `crashes <http://www.divx-digest.com/software/divxcodec4.html>`__ when
encoding to DivX4 in YV12.)

Using TMPGEnc you have to add the line
`ConvertToRGB24 <corefilters/convert.rst>`__ to your script, and for CCE
SP you need to add the line `ConvertToYUY2 <corefilters/convert.rst>`__
to your script, since Windows has no internal YV12 compressor.  You can
also install DivX5 one of the recent XviD builds of Koepi
(`XviD-04112002-1 or newer <http://roeder.goe.net/~koepi/xvid.shtml>`__)
which will decompress the YV12-AVI for you when loading the avi in
TMPGEnc or CCE SP.

Q1.11: How do I use with AviSynth v2.5 with Gordian Knot?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- If you are using GKnot 0.26 you have to rename mpeg2dec3.dll (the one
  for AviSynth v2.5) to mpeg2dec.dll, and virtualdubmod.exe to
  virtualdub.exe (keeping copies of the original exe and dll somewhere).

- If you are using GKnot 0.27 you can follow the same procedure as
  above, or you can enter mpeg2dec3.dll as an alternative mpeg2dec.dll in
  the options menu and rename virtualdubmod.exe to virtualdub.exe.

- But you can also try the new GKnot 0.28.

| If you are using VirtualdubMod 1.4.13.1 older and experience problems,
  download the latest
  `prerelease <http://sourceforge.net/project/showfiles.php?group_id=65889&release_id=130443>`__.

Q1.12: What are the main advantages and processing/encoding in YV12?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: There are two advantages:

- speed increase:

  It depends entirely on the external plugins whether they will have YV12
  support or not.  If they have then speed increases like 25-35 percent are
  expected.  Of course there will only be a large speed increase if both your
  source and target are in YV12, for example in DVD to DivX/Xvid conversions.

- no color conversions:

  It depends entirely on the external plugins whether they will have YV12
  support or not.  If they have then speed increases like 25-35 percent are
  expected.  Of course there will only be a large speed increase if both your
  source and target are in YV12, for example in DVD to DivX/Xvid conversions.


Q1.13: Is there a command line utility for encoding to DivX/XviD using AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: As explained in `Q1.9 <#q1-9-which-encoding-programs-support-yv12>`__ there is a command line utility
called `AVS2AVI <http://forum.doom9.org/showthread.php?s=&threadid=36768>`__
(and AVS2AVI GUI) for encoding to DivX/XviD using AviSynth.

Q1.14: Where can I find VCF2AVS?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: VCF2AVS is a nice litte tool to convert vcf to avs files. You can
edit your captures in vdub (basically cutting, cropping and resizing),
then edit the resulting avs. Be carefull since there are two versions
floating around:

-  VCF2AVS by Darksoul71 which can be found
   `here <http://forum.doom9.org/showthread.php?s=&threadid=41927>`__.

-  VCF2AVS by BB (more basic) which can be found
   `here <http://forum.doom9.org/showthread.php?s=&threadid=30587>`__.

Try them both and look which one fullfills your needs :)

Q1.15: How do I use a plugin compiled for v2.0x in v2.5x?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: In `WarpSharp-package for AviSynth v2.5x <#JapanesePlugin>`__ you
will find a plugin called "LoadPluginEx.dll". **When using an older
version of LoadPluginEx.dll, don't move this plugin to your plugin dir. 
But move it to a separate dir, otherwise VirtualdubMod and WMP6.4 will
crash on exist.**  This will enable you using v2.0x plugins in v2.5x. 
An example script (using the v2.0x plugin Dust by Steady):
::

    LoadPlugin("C:\Program Files\avisynth2_temp\plugins\LoadPluginEx.dll")
    LoadPlugin("C:\Program Files\avisynth2_temp\plugins\dustv5.dll")

    AviSource("D:\clip.avi").ConvertToYUY2
    PixieDust(5)


Q1.16: How do I switch between differents AviSynth versions without re-install?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A:

-  You can use AvisynthSwitcher available
   `here <http://www.lalternative.org>`__.  Versions 2.08 and 2.50 are
   provided, but you can easily add a new one under
   AvisynthSwitcher\\versions\\Avisynth 2.x.x.
-  Some other ways are described
   `here <http://forum.doom9.org/showthread.php?s=&threadid=45181>`__.


Q1.17: How do I make an AVS-file?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: See `Q1.19 <#q1-19-how-do-i-know-which-version-number-of-avisynth-i-have>`__ (using the text editor you prefer).

Q1.18: Where do I save my AVS-file?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Anywhere on your harddrive.

Q1.19: How do I know which version number of AviSynth I have?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Open a text-editor, for example notepad. Add the following line

  `Version <corefilters/version.rst>`__

and save the file with the extension "avs".  Save for example as
version.avs (make sure that the extension is "avs" and not "txt").  Open
the file in an application which can read AVI-files, for example WMP
6.4. The version number will be displayed.

Q1.20: Does AviSynth have a GUI (graphical user interface)?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Several nice tools are available:

- VirtualdubMod, see also `Q1.9 <#q1-9-which-encoding-programs-support-yv12>`__.  Regarding to AviSynth the
  following utilities are added:

  - 'Open via AVISynth' command. This allows you to open any AviSynth
    compatible video file by automatically generating a suitable script by a
    selectable template.

  - AVS Editor (Hotkey Ctrl+E): Just open your AVS and under tools select
    "script editor". Change something and press F5 to preview the video.

- `AvisynthEditor, an advanced AviSynth script editor featuring syntax highlighting,
  auto-complete code and per versions plugin definitions files. Here is a
  `screenshot <http://web.archive.org/web/20100617104422/http://www.lalternative.org/img/AvisynthEditor.gif>`__.  It
  can be found `here <http://web.archive.org/web/20100810100731/http://www.lalternative.org/>`__.  Discussion can be
  found on `Doom9.org
  forum <http://forum.doom9.org/showthread.php?s=&threadid=49487>`__.

- `AVSGenie <http://www.yeomanfamily.demon.co.uk/avsgenie/avsgenie.rst>`__:
  AVSGenie allows the user to select a filter from a drop down list or
  from a popup menu. An editable page of parameters will then be brought
  into view, with a guide to the filter and it's parameters. A video
  preview window opens, showing "source" and "target" views.  The source
  window, in simple cases, shows output of the first line of the script,
  generally an opened video file. The target window shows the output of
  the whole script. In this way, effects of filters can easily be seen.
  The line which represents the source window can be changed.  Discussion
  can be found
  `here <http://forum.doom9.org/showthread.php?s=&threadid=54090>`__.

- `SwiftAVS (by Snollygoster) <http://www.swiftavs.net>`__: Another nice
  gui, formerly known as AviSynthesizer.
  [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=48326>`__\ ]

Q1.21: I got the message "LoadPlugin: unable to load "xxx" is not an AviSynth 1.0/AviSynth 2.5 plugin"?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: You are using a plugin which is not compatiable with that version
of AviSynth.  Have a look at `Q1.8 <#q1-8-are-plugins-compiled-for-v2-5x-compatible-with-v1-0x-v2-0x-and-vice-versa>`__.

Q1.22: How do I know which colorspace I'm using at a given place in my script?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: To see which colorspace you are using at a given place in your
script, add:

  `Info <corefilters/info.rst>`__

... and AviSynth will give you much information about colorspace
amongst other things!

Q1.23: I installed AviSynth v2.5 and DivX5 (or one of the latest Xvid builds of Koepi), all I got is a black screen when opening my avs in Virtualdub/!VirtualdubMod/CCE/TMPGEnc?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Ok, apperently your video is not decompressed by DivX5 (or XviD).  Go
to your windows-dir and rename a file called MSYUV.DLL, or add the
following to your registry file:
::

    REGEDIT4

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32]
    "VIDC.YV12"="divx.dll"

Replace "divx.dll" by "xvid.dll" for XviD.

Q1.24: My computer seems to crash at random during a second pass in any encoder?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A : AviSynth (especially v2.5x) is highly optimized. As a consequence
it is possible that your computer seems to crash at random during a
second pass. Try running the
[`Prime95 <http://www.mersenne.org/freesoft.rst>`__\ ] stress test for
an hour, to check if your system is stable. If this test fails (or your
computer locks up) make sure that your computer is not overclocked and
lower your bus speed of your processor in steps of (say) five MHz till
the crashes are gone.

Q1.25:VirtualdubMod, WMP6.4, CCE and other programs crash every time on exit (when previewing an avs file)?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: This problem arises if you got an older version of LoadPluginEx.dll
(or WarpSharp.dll) of the WarpSharp package in your plugin dir. The
solution is to move it outside the plugin directory and load it
manually. I hope that the maker of this plugin also noticed this ...

Q1.26: Are there any lossless YV12 codecs, which I can use for capturing for example?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: There are several of them:

#. `VBLE codec (by MarcFD) <http://forum.doom9.org/showthread.php?s=&threadid=38389&pagenumber=5>`__:
   an huffyuv based encoder
#. `LocoCodec (by TheRealMoh) <http://forum.doom9.org/showthread.php?s=&threadid=50363>`__
#. `MJPEG codec <http://forum.doom9.org/showthread.php?s=&threadid=48504>`__:
   Leaves a small logo in the right upper side of the clip.


S2: AviSynth and frameserving
-----------------------------

Q2.1: What is frameserving and what is it good for?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: An excellent discription is found on `Lukes
homepage <http://neuron2.net/LVG/frameserving.html>`__:

"Frameserving is a process by which you directly transfer video data
from one program on your computer to another. No intermediate or
temporary files are created. The program that opens the source file(s)
and outputs the video data is called the frameserver. The program that
receives the data could be any type of video application.

There are two main reasons that you would want to frameserve a video:

#. Save Disk Space:

   Depending the on the frameserving application, you can usually edit/process
   your video as it is being frameserved. Because frameserving produces no
   intermediate files, you can use a frameserver to alter your videos without
   requiring any additional disk space. For example, if you wanted to join two
   video files, resize them, and feed them to another video application,
   frameserving would allow you to do this without creating a large intermediate
   file.

#. Increased Compatibility:

   To the video application that's receiving the frameserved video, the input
   looks like a relatively small, uncompressed video file. However, the source
   file that the frameserver is transferring could actually be, for example, a
   highly compressed MPEG-1 video. If your video application doesn't support
   MPEG-1 files, it's not a problem because the application is just receiving
   standard uncompressed video from the frameserver. This feature of
   frameserving enables you to open certain types of files in an application
   that wouldn't normally support them.


Furthermore, because the video application is being fed the source
video one frame at a time, it doesn't know anything about the file size
of the source video. Therefore, if your application has 2 GB or 4 GB
limit on input file size, it won't have any effect on your frameserved
video. You could feed 100 GB of video via a frameserver to an
application limited to 2 GB and it wouldn't cause a problem."

Q2.2: How do I use AviSynth as a frameserver?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Write a script using a text editor. Load your clip (see
`Q2.8 <#q2-8-how-do-i-load-my-clip-into-avisynth-video>`__) in AviSynth, do the necessary filtering and load the
AVS-file in encoder/application X (must be an encoder or application
which can read AVI-files, see `Q2.3 <#q2-3-how-do-i-frameserve-my-avs-file-to-encoder-application-x>`__ and `Q2.4 <#q2-4-problems-when-encoder-x-reads-avs-files>`__).

Q2.3: How do I frameserve my AVS-file to encoder/application X?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A:

- Frameserving to TMPGEnc, CCE SP, VirtualDub or WMP6.4:

  Just open your AVS-file in TMPGEnc, CCE SP, VirtualDub or WMP6.4 (or whatever
  encoder/application you use) and have a look at `Q2.4 <#q2-4-problems-when-encoder-x-reads-avs-files>`__.


- Frameserving to VFAPI:

  For VFAPI you need to install the `ReadAVS <http://www.vcdhelp.com/forum/userguides/87270.php>`__ plugin. Just copy ReadAVS.dll to
  the VFAPI reader directory and open the reg-file ReadAVS.reg in notepad and
  change the corresponding path. Save it, and doubleclick on it to merge it
  with your registry-file.

- Frameserving to Premiere or Ulead:

  - For frameserving to Premiere there exists an import plugin
    "IM-Avisynth.prm". The original version can be downloaded from `Bens
    site <http://math.berkeley.edu/~benrg/avisynth-premiere.html>`__. A
    much improved version can be downloaded from the [`Video Editors Kit
    sourceforge
    page <http://sourceforge.net/projects/videoeditorskit/>`__\ ]. This
    works for Premiere 5.x,6.x and Pro at present. To install the import
    plugin move the IM-Avisynth.prm file into your Premiere "Plug-ins"
    directory.
  - You can also download a program called [`makeAVIS (included in the
    ffvfw codec
    package <http://cultact-server.novi.dk/kpo/avisynth/avs_cvs.html>`__\ ]
    (this is an AVI Wrapper),
    [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=49964>`__\ ].
    Note that this program is included in the installation of AviSynth
    v2.52. For Ulead you must use this program.

- Frameserving to Windows Media 9 Encoder:

  Download Nic's Windows Media 9 Encoder and make sure you also
  installed the Windows Media 9 codec. Both can be found
  `here <http://nic.dnsalias.com/WM9Enc.html>`__.

.. _Problems when Encoder X reads AVS-files:

Q2.4: Problems when Encoder X reads AVS-files?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A:

*Why can't I open my AVS-file in TMPGEnc (this happens in old versions
of TMPGEnc)?*

-  Install VFAPI plugin for TMPGEnc
-  Disable the direct show filters within TMPGEnc and turn off the
   VirtualDub proxy before frameserving.

-  Add "`ConvertToRGB24 <corefilters/convert.rst>`__\ ()" at the end of
   your AVS-file
-  Install
   `Huffyuv <http://avisynth.nl/index.php/Huffyuv>`__/`DivX5 <http://avisynth.nl/index.php/DivX>`__
   codec so that it can do the decompression for you when loading an AVI
   in TMPGEnc.
-  Install the
   `ReadAVS <http://www.dvdrhelp.com/forum/userguides/87270.php>`__
   plugin for TMPGEnc

*CCE SP crashes when reading an AVS-file, what to do?*

-  If you're using Win2k then run CCE in WinNT4-SP5 compatibility mode.
-  If you're frameserving with AviSynth v1.0x/v2.0x put
   "`ResampleAudio <corefilters/resampleaudio.rst>`__\ (44100)" in your
   script, even if you don't have any audio in your AVS-file.
-  If you're frameserving with AviSynth v2.5x the ResampleAudio trick
   doesn't work anymore because it doesn't add a silent audio stream to
   your video clip.  Instead make a script (called "addaudio.avsi") as
   described `here <http://avisynth.nl/index.php/AddAudio>`__,
   and put it in your plugin dir.

*Encoders/players (like CCE SP v2.62/v2.64) will not read AVS-files ?*

Many "new" programs do NOT use the Windows functions to read the
AVI-files. If they do NOT use those standard Windows functions the
AviSynth-script files will not work. Known programs that do NOT use
those routines are CCE SP v2.62, Windows Media Encoder vx.x. Furthermore
people report problems with Windows Media Player 7.

-  Use CCE SP v2.50 and WMP6.4 (under "Program Files" and "Windows Media
   Player" you will find a file called "mplayer2.exe", this is WMP6.4).
   In case that you want to use Windows Media Encoder you can use the
   AVI Wrapper "makeAVIS" instead, see\ `Q2.3 <#q2-3-how-do-i-frameserve-my-avs-file-to-encoder-application-x>`__. For Windows
   Media Encoder 9 have a look at `Q2.3 <#q2-3-how-do-i-frameserve-my-avs-file-to-encoder-application-x>`__.
-  If you still want to use CCE SP v2.62 you can try the following:
   Frameserve to CCE SP v2.62 with VFAPI. Create an AVS script and then
   make a fake AVI with VFAPI (VFAPI accepts AVS-files, see
   `Q2.3 <#q2-3-how-do-i-frameserve-my-avs-file-to-encoder-application-x>`__, and can be downloaded from Dooms site).
-  Cinemacraft says that their CCE SP v2.66 can accept AviSynth
   scripts.  So if you have this version you sould be safe.

*Wrong YUY2 Codec causes colorspace errors on AviSynth scripts feeding
TMPGEnc?*

Some time ago I suddenly found that feeding TMPGEnc with an AviSynth
script resulted in what looked like a colorspace conversion error; as if
the video had been badly dithered down from 24 bit to 8 bit! (..)

If you have such problems add
"`ConvertToRGB24 <corefilters/convert.rst>`__\ " as the last line of
your script or have a look at the thread (and the suggested solutions)
`colorspace conversion
errors <http://forum.doom9.org/showthread.php?s=&threadid=27932>`__.

Q2.5: How do I frameserve from Premiere/Ulead/Vegas to AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: You can try the AviSynth compatible frameserver (import) for
[`PluginPace frameserver (by Satish Kumar) <http://www.debugmode.com/pluginpac/frameserver.php>`__\ ]:
For frameserving from SonicFoundry Vegas (and earlier Vegas Video/VideoFactory? versions),
Adobe Premiere or Ulead MediaStudio Pro to AviSynth.
[`discussion <http://forum.doom9.org/showthread.php?s=&threadid=51242>`__\ ].

Q2.6: When frameserving I got the following message: "Script error, there is no function named "xxx (the name of some filter)""?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: You probably installed/registered a version of AviSynth which
doesn't contain the filter.  Make sure that there are no other versions
floating around on your hard disc (there's a possibility that a version
will be registered while it is not in your system directory).  Check
whether the correct version is registered, see also `Q1.19 <#q1-19-how-do-i-know-which-version-number-of-avisynth-i-have>`__.

Q2.7: I get an unrecognized exception error trying to load an avs file with VirtualDub, using dvd2avi v1.77.3?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: .d2v created with dvd2avi v1.77.3 is NOT compatible with
mpeg2dec.dll! Use v1.76 instead. If you still want to use v1.77.3, make
sure that you have AviSynth v2.5 installed and mpeg2dec3.dll v1.07 (or a
more recent version).

Q2.8: How do I load my clip into AviSynth (video)?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Make a script containing the lines (replace the filename and the
path of the filename):

1. AVI-files (with uncompressed WAV, or CBR/VBR MP3-audio (starting from v2.04)):

::

    AviSource("d:\filename.avi")

    or disabling the audio:

    AviSource("d:\filename.avi", false)

2. AVI-files that AVISource doesn't support (for example "DV type I AVI-files"):

::

    DirectShowSource("d:\filename.avi")
    DirectShowSource("d:\\filename.mpg")


3. Have a look at the `Mpeg decoder plugins for AviSynth v1.0x/v2.0x <#MpegDecoders>`__
   and the `Mpeg decoder plugins for AviSynth v2.5x <#MpegDecoders2>`__:

   Using AviSynth v2.0x/AviSynth v2.5x and MPEGdecoder.dll:

::

    LoadPlugin("d:\MPEGdecoder.dll")
    mpegsource("d:\filename.mpg")

4. MPEG2-files (extension m2p or m2v):

   Have a look at the `Mpeg decoder plugins for AviSynth v1.0x/v2.0x <#MpegDecoders>`__
   and the `Mpeg decoder plugins for AviSynth v2.5x <#MpegDecoders2>`__. Some examples:

- Using AviSynth v2.0x and mpeg2dec.dll:

  Make a DVD2AVI project file and save it (filename.d2v) and load this clip into AviSynth:

::

    LoadPlugin("d:\mpeg2dec.dll")
    mpeg2source("d:\filename.d2v")

- Using AviSynth v2.5x and MPEGdecoder.dll:

::

    LoadPlugin("d:\MPEGdecoder.dll")
    mpegsource("d:\filename.m2p")

    or (only the video stream)

    LoadPlugin("d:\MPEGdecoder.dll")
    mpegsource("d:\filename.m2v", -2, "raw")

5. VOB-files:

   Have a look at the `Mpeg decoder plugins for AviSynth v1.0x/v2.0x <#MpegDecoders>`__
   and the `Mpeg decoder plugins for AviSynth v2.5x <#MpegDecoders2>`__. Some examples:

- Using AviSynth v2.0x and mpeg2dec.dll:

  Make a DVD2AVI project file and save it (filename.d2v) and load this clip into AviSynth:

::

    LoadPlugin("d:\mpeg2dec.dll")
    mpeg2source("d:\filename.d2v")

- Using AviSynth v2.5x and MPEGdecoder.dll:

::

    LoadPlugin("d:\MPEGdecoder.dll")
    mpegsource("d:\filename1.vob+d:\filename2.vob")

6. ATSC transport streams (extension ``*.trp`` or ``*.ts``):

-  Using AviSynth v2.0x:

   Download mpeg2dec2 and a special version of `dvd2avi <http://www.trbarry.com/DVD2AVIT3.zip>`__.  Don't forget to
   specify the video and audio pid's in the DVD2AVI.ini file:

::

    LoadPlugin("d:\mpeg2dec2.dll")
    mpeg2source("d:\filename.d2v")

-  Using AviSynth v2.0x/v2.5x:

   Download mpeg2dec3 or mpegdecoder and a special version of `dvd2avi <http://www.trbarry.com/DVD2AVIT3.zip>`__:

::

    LoadPlugin("d:\mpeg2dec3.dll")
    mpeg2source("d:\filename.d2v")

    or if you want to used mpegdecoder:

    LoadPlugin("d:\mpegdecoder.dll")
    mpegsource("d:\filename.d2v")

If both methods fail you can try `HDTV2MPEG2 <http://www.avsforum.com/avs-vb/attachment.php?s=&postid=1408610>`__ (produces non dvd compliant
mpeg2 files) to create a temporary mpeg2 file and import that in AviSynth
with dvd2avi. For demuxing AAC audio: use [`TSDemux <http://www.avsforum.com/avs-vb/showthread.php?s=&threadid=222055>`__]. The Moonlight
`Xmuxer <http://www.moonlight.co.il/download/?dl=xmuxer>`__ package has also a bunch of DirectShow filters that deal with
muxing and demuxing MPEG-1/2 TS and PVA files.

7. PVA transport streams:

   You are out of luck here.  AFAIK the only options are PVAStrumento and
   `Xmuxer <http://www.moonlight.co.il/download/?dl=xmuxer>`__.

8. d2v-files (DVD2AVI frameserver files):

::

    LoadPlugin("d:\mpeg2dec.dll")
    mpeg2source("d:\filename.d2v")

9. vdr-files (VirtualDubs frameserver files):

::

    AVISource("d:\filename.vdr")

10. ASF-files (the framerate has to be specified, right click on the file in windows explorer):

::

    DirectShowSource("d:\filename.asf", fps=15)

11. tpr-files (TMPGEnc project files):

    First note that the plugin GreedyHMA is proving to be a better IVTC
    solution (not to mention *MUCH* easier) than TMPGEnc. So if you want
    to use TMPGEnc for this get the GreedyHMA plugin (this plugin works in
    YUV-space).

    If you still want to import a tpr-file into an AVS-file, there are two
    possibilities:

- The TMPGEnc plugin is contained in the VFAPI Plugin zip file (ends
  with -vfp.zip) which can be download from Dooms site. (This method
  doesn't always work, some encoders like CCE SP can't read them.)

::

    LoadVFAPIplugin("d:\TMPGenc.vfp","TMPGsource")
    TMPGsource("d:\filename.tpr")
    FlipVertical

- Import the tpr-file in VFAPI, create a fake avi and then load it into
  AviSynth (note that VFAPI works in RGB-space). See also
  `<http://forum.doom9.org/showthread.php?s=&threadid=10007>`__.

12. aup-files (AviUtl projects)

    I don't know if it is possible to load it directly into AviSynth.
    Import the aup-file in VFAPI, create a fake avi and then load it into
    AviSynth (note that VFAPI works in RGB). See also
    `<http://forum.doom9.org/showthread.php?s=&threadid=10007>`__.

13. QuickTime-files (see `<http://forum.doom9.org/showthread.php?s=&threadid=23139>`__):

    Use DirectShowSource:

::

    DirectShowSource("d:\filename.mov")

    or if that doesn't work download a plugin (can be found in Dooms download section):

    LoadVFAPIPlugin("C:\QTReader\QTReader.vfp", "QTReader")
    QTReader("C:\quicktime.mov")

14. AVS-files:

    Just import it at the beginning of your script:

::

    Import("d:\filename.avs")

In v2.05 or more recent version you can use the autoplugin loading. 
Just move your AVS-file in the plugindir containing the other (external)
plugins, and rename (since v.2.08, v2.5) the extension to 'avsi'.  See
also `Q5.2 <#q5.2>`__.


Q2.9: How do I load my clip into AviSynth (audio)?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: This can be done in several ways:

1. Using AviSource (with uncompressed WAV, CBR/VBR MP2-audio (starting
   from v2.04) or CBR/VBR MP3-audio (starting from v2.04)):

::

    AviSource("d:\filename.avi")

    Starting from v2.05 you can extract audio from a AVI-file in this way:

    WavSource("d:\filename.avi")

2. Use the audio decoder plugin MPASource, see `Q3.4 <#q3-4-where-can-i-download-external-filters-for-avisynth-v1-0x-v2-0x>`__ and
   `Q3.5 <#q3-5-where-can-i-download-external-filters-for-avisynth-v2-5x>`__ for importing mp1/mp2/mp3 audio.
3. See `DirectShowSource <corefilters/directshowsource.rst>`__ for
   downmixing AC3 audio.
4. Put a WAV-header on your
   `mp2 <http://www.geocities.wilbertdijkhof/mpa2wav.zip>`__ or mp3
   (with Besweet) audio file and use WavSource to import the audio.  You
   also need ACM codecs for
   `mp2 <http://www.geocities.wilbertdijkhof/qmpeg_mp2.zip>`__, and for
   mp3 (Radium codec, see doom's download section).  Use WavSource to
   load the WAV:

::

    WavSource("d:\filename.wav")

Up to v2.07 the audio must be mono or stereo.  Starting from v2.5 you
can also import uncompressed multichannel audio.

Q2.10: Can I import an audio file other than a WAV-file?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Yes:

-  Uncompressed audio files (that is uncompressed WAV-files) can be
   loaded in all versions up to v2.03.
-  Starting from v2.04 compressed WAV-files can be loaded (currently
   only MP2/MP3-files with a WAV-header).
-  Starting from v2.5 you can also load uncompressed multichannel audio.
-  Using the MPASource and AC3filter plugins you can import mp1/mp2/mp3
   and AC3 audio.

| See also `Q2.9 <#q2-9-how-do-i-load-my-clip-into-avisynth-audio>`__.
|  

Q2.11: How do I join video and audio?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Make an avs-file containing the lines (change the filenames and paths):
::

    video = AviSource("d:\filename1.avi")
    audio = WavSource("d:\filename2.wav")
    AudioDub(video, audio)

Q2.12:  I get an unrecognized exception in the line where I use DirectShowSource?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Have you got VobSub installed? Have a look at this
`thread <http://forum.doom9.org/showthread.php?s=&threadid=34350>`__.
Upgrade to VobSub v2.20 or higher. If someone has an explanation, please
post it in the thread.

S3: Filters and colorspaces
---------------------------

Q3.1: What is RGB/YUV-colorspace?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: These are two different ways to represent colors: YUV colorspace and
RGB colorspace.  In YUV colorspace there is one component that represent
lightness (luma) and two other components that represent color
(chroma).  As long as the luma is conveyed with full detail, detail in
the chroma components can be reduced by subsampling (filtering, or
averaging) which can be done in several ways (thus there are multiple
formats for storing a picture in YUV colorspace).  In RGB colorspace
there are three components, one for the amount of Red, one for the
amount of Green and one for the amount of Blue.  Also in the colorspace
there are multiple formats for storing a picture which differ in the
amount of samples are used for one of the three colors.

Information can be found here: `YUV
Formats <http://www.fourcc.org/fccyuv.rst>`__, `RGB
Formats <http://www.fourcc.org/fccrgb.rst>`__, `MSDN YUV
Formats <http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/YUVFormats.asp>`__
and `Chroma subsampling by Charles
Poyton <http://www.inforamp.net/~poynton/PDFs/Chroma_subsampling_notation.pdf>`__.

As of AviSynth v1.0x/v2.0x, RGB24, RGB32, and YUY2 are supported.  In
AviSynth v2.5x there is also support for YV12.

Q3.2: In which colorspaces do AviSynth and the internal filters work?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: AviSynth works in RGB and YUV using the RGB32, RGB24, YUY2 and YV12
formats.  Most of the internal filters work in any of these formats,
too. Which color format a filter requires, can be found
[`here <quick_ref.rst>`__].

Q3.3: How do I load a plugin in to AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Starting from v2.05 you can use its auto-plugin loading feature. The
path of the plugin directory is set during install. But if you want to
change it for some reason, change or add the following lines:
::

    REGEDIT4

    [HKEY_LOCAL_MACHINE\SOFTWARE\Avisynth]
    "PluginDir"="c:\\program files\\avisynth 2.5\\plugins"

Change the path above if necessary and make sure you created the
plugin-dir as well. Save it as install\_autoplugin.reg, and merge it to
your registry file by right-clicking on it in your explorer. Finally
move all your plugins/script-functions into the plugin directory. If you
want to load plugins manually, use "LoadPlugin". An example script:
::

    LoadPlugin("d:\mpeg2dec.dll")
    mpeg2source("d:\filename.d2v")

Q3.4: Where can I download external filters for AviSynth v1.0x/v2.0x?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Most of them can be found in the AviSynth section at Doom9. But below
you will find links to most of them. If you know of a plugin which is
missing, please feel free to add it to the list using the "Edit this
document" link to the left. Most of these plugins work in YUY2. If you
can't find the plugin (the attachments are still disabled), you can
download the plugins at
[`WarpEnterprises <http://www.avisynth.nl/users/warpenterprises/>`__]
homepage.

| **Deinterlacing & Pulldown Removal:**
| *All PAL, NTSC, and SECAM video is interlaced, which means that only
  every other line is broadcast at each refresh interval.  Deinterlacing
  filters let you take care of any problems caused by this. IVTC (inverse
  telecine, aka pulldown removal) filters undo the telecine process, which
  comes from differences between the timing of your video and its original
  source.*

#. `Decomb Filter package (by Donald
   Graft) <http://neuron2.net/mine.html>`__: This package of plugin
   functions for AviSynth provides the means for removing combing
   artifacts from telecined progressive streams, interlaced streams, and
   mixtures thereof. Functions can be combined to implement inverse
   telecine for both NTSC and PAL streams. *[YUY2]*
#. `ViewFields/UnViewFields (by Simon
   Walters) <http://www.geocities.com/siwalters_uk/fnews.html>`__:
   ViewFields and UnViewFields are a complementary pair of filters to
   display and identify top and bottom fields from an interlaced source.
   *[YUY2]*
#. `GreedyHMA plugin (by Tom
   Barry) <http://www.trbarry.com/GreedyHMA.zip>`__: DScaler's Greedy/HM
   algorithm code to perform pulldown matching, filtering, and video
   deinterlacing. *[YUY2]*
#. `Motion compensated deinterlace filter "TomsMoComp" (by Tom
   Barry) <http://forum.doom9.org/showthread.php?s=&threadid=28778>`__:
   This filter uses motion compensation and adaptive processing to
   deinterlace video source (not for NTSC film). *[YUY2]*
#. `SmoothDeinterlacer (by Gunnar Thalin, ported to AviSynth by
   Xesdeeni) <http://home.bip.net/gunnart/video/AVSPorts/SmoothDeinterlacer/>`__:
   A port of the VirtualDub [Smooth Deinterlacer] filter. *[YUY2, RGB]*
#. IVTC plugin v2.2 (by "Wizard\_FL", Dooms download section): This
   plugin reverses the telecine process. *[YUY2]*
#. `"IT" (by
   thejam79) <http://members.tripod.co.jp/thejam79/IT_0051.zip>`__:
   Inverse telecine plugin. `Translation of
   README <http://avisynth.nl/index.php/IT>`__
#. `"AntiComb" (by
   ?) <http://www.geocities.co.jp/SiliconValley-Sunnyvale/3109/acomb05.zip>`__:
   This filter remove combing (interlace artifacts). `Translation of
   README <https://web.archive.org/web/20050317011825/http://www.avisynth.org/index.php?page=AntiComb>`__
#. See also Auto24FPS and AutoDeint in the
   `MiscPlugins <#MiscellaneousPlugins>`__ section below.

| **Spatio-Temporal Smoothers:**
| *These filters use color similarities and differences both within and
  between frames to reduce noise and improve compressed size.  They can
  greatly improve noisy video, but some care should be taken with them to
  avoid blurred movement and loss of detail.*

#. `PeachSmoother (by Lindsey
   Dubb) <http://students.washington.edu/ldubb/computer/PeachSmoother.zip>`__:
   An adaptive smoother optimized for TV broadcasts:
   `documentation <http://students.washington.edu/ldubb/computer/Read_Me_Peach_Smoother.rst>`__;
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=36575>`__.
   The Peach works by looking for good pixels and gathering orange smoke
   from them. When it has gathered enough orange smoke, it sprinkles
   that onto the bad pixels, making them better. Works only on computers
   with SSE instructions (Athlons, Pentium 3 or 4, recent Celerons, or
   later). *[YUY2]*
#. `"MAM" (by Marc
   FD) <http://ziquash.chez.tiscali.fr/%20Motion%20Adaptive%20Mixer>`__:
   This filter uses movement detection to adapt the denoising method
   used, in still areas it uses temporal filtering and in moving areas
   it uses spatial filtering with any spatial and temporal filter you
   want.  It is no longer developed but it can temporarily be downloaded
   from this
   `site <http://forum.doom9.org/showthread.php?s=&postid=193412>`__.
   *[YUY2]*
#. `NoMoSmooth (by
   SansGrip) <http://www.jungleweb.net/~sansgrip/avisynth/>`__: A motion
   adaptive spatio-temporal smoother:
   `documentation <http://www.jungleweb.net/~sansgrip/avisynth/NoMoSmooth-readme.html>`__;
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=37471>`__.
   *[YUY2]*
#. `Dust (by
   Steady) <http://forum.doom9.org/showthread.php?s=&threadid=42749>`__:
   A noise remover. *[YUY2, RGB]*
#. `SpatioTemporal Median Filter "STMedianFilter" (by Tom
   Barry) <http://www.trbarry.com/STMedianFilter.zip>`__: STMedianFilter
   is a (slightly motion compensated) spatial/temporal median filter.
   Bug: strange color changes (clip becomes purple) *[YUY2]*
#. `Convolution3D (by Vlad59) <http://hellninjacommando.com/con3d/>`__:
   Convolution3D is a spatio-temporal smoother, it applies a 3D
   convolution filter to all pixels of consecutive frames. *[YUY2]*

| **Spatial Smoothers:**
| *These use color similarities and differences within a frame to
  improve the picture and reduce compressed size. They can smooth out
  noise very well, but overly aggressive settings for them can cause a
  loss of detail.*

#. `Masked Smoother "msmooth" (by Donald
   Graft) <http://forum.doom9.org/showthread.php?s=&threadid=31679>`__:
   The filter is effective at removing mosquito noise as well as
   effectively smoothing flat areas in (especially) anime. (currently in
   the repair shop) *[RGB]*
#. `Smoother HiQ(uality) plugin (by Klaus
   Post) <http://cultact-server.novi.dk/kpo/avisynth/smooth_hiq_as.html>`__:
   This filter performs (spatial) smoothing on video material to
   eliminate noise and MPEG artifacts. *[YUY2]*
#. `msoften (by Marc
   FD) <http://forum.doom9.org/showthread.php?s=&threadid=44308>`__:
   This Filter is a spatial denoiser like 2dcleaner.  Some discussion
   can be found
   `here <http://forum.doom9.org/showthread.php?s=&threadid=36148>`__.
   *[YUY2]*
#. `General convolution plugin (by Richard
   Berg) <http://forum.doom9.org/showthread.php?s=&threadid=28318>`__: A
   spatial smoother
   (`description <http://forum.doom9.org/showthread.php?s=&threadid=25908>`__).
   This plugin will be a built-in function starting from AviSynth v2.01.
   *[YUY2, RGB]*
#. `Wavelet Noise Reduction (by
   thejam) <http://forum.doom9.org/showthread.php?s=&threadid=31754>`__:
   It can remove single-frequency noise in three different frequency
   bands, independently for X- and Y-direction and for the Y, Cr and Cb
   colorplane
   (`documentation <http://forum.doom9.org/showthread.php?s=&threadid=31754&pagenumber=2>`__).
   Note that it only works for PC's with SSE instructructions. *[YUY2]*
#. `2D Cleaner Noise Reduction filter
   "\_2DClenYUY2" <http://members.tripod.co.jp/kiraru2002/>`__ *[YUY2]*
#. Also see KenKunNR in the `Misc Plugins <#MiscellaneousPlugins>`__
   section, below.

| **Temporal Smoothers:**
| *These filters use color similarities and differences between frames
  to improve the picture and reduce compressed size.  They can get rid of
  most noise in stationary areas without losing detail, but overly strong
  settings can cause moving areas to be blurred.*

#. `TemporalSoften2 plugin (by
   Dividee) <http://forum.doom9.org/showthread.php?s=&threadid=22096>`__:
   This plugin is better than the built-in TemporalSoften up to v2.02;
   it removes noise from a video clip by selectively blending pixels. 
   It is built into v2.03 and all subsequent versions (it replaces the
   old function and it is called the same: TemporalSoften). *[YUY2]*
#. `TemporalSmoother plugin (by
   Dividee) <http://users.win.be/dividee/avisynth.html>`__: This filter
   is an adaptive noise reducer, working along the time axis. *[YUY2]*
#. `TemporalCleaner (by Jim Casaburi; ported to AviSynth by
   Vlad59) <http://forum.doom9.org/showthread.php?s=&threadid=37620>`__:
   A simple but very fast temporal denoiser, aimed to improve
   compressibility. *[YUY2]*
#. `Grape Smoother (by Lindsey
   Dubb) <http://students.washington.edu/ldubb/computer/GrapeSmoother.zip>`__:
   `documentation <http://students.washington.edu/ldubb/computer/Read_Me_Grape_Smoother.rst>`__;
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=37196>`__; 
   When colors change just a little, the filter decides that it is
   probably noise, and only slightly changes the color from the previous
   frame. As the change in color increases, the filter becomes more and
   more convinced that the change is due to motion rather than noise,
   and the new color gets more and more weight. *[YUY2]*
#. `Chroma Noise Reducer (by Marc
   FD) <http://forum.doom9.org/showthread.php?s=&threadid=44308>`__:
   Reduces the noise on the chroma (UV) and preserves the luma (Y),
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=29529>`__.
   *[YUY2]*
#. `Dynamical Noise Reduction 2 filter
   "DNR2" <http://members.tripod.co.jp/kiraru2002/>`__ *[YUY2, RGB]*
#. Also see KenKunNRT in the `Misc Plugins <#MiscellaneousPlugins>`__
   section, below.

| **Sharpen/Soften Plugins:**
| *These are closely related to the Spatial Smoothers, above.  They
  attempt to improve image quality by sharpening or softening edges.*

#. `Smart sharpening filter "MSharpen" (by Donald
   Graft) <http://neuron2.net/mine.html>`__: This filter is very
   effective at sharpening important edges without amplifying noise.
   *[YUY2, RGB]*
#. `Sharpen/Blur filter "Focus2" (by Marc
   FD) <http://forum.doom9.org/showthread.php?s=&threadid=44308>`__:
   Sharpen2 and Blur2 are MMX optimisations of the built in Sharpen and
   Blur functions.  Starting from v2.50 it will replace the Sharpen and
   Blur functions. *[YUY2, RGB]*
#. `Unfilter plugin (by Tom
   Barry) <http://www.trbarry.com/UnFilter.zip>`__: This filter
   softens/sharpens a clip:
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=28197>`__. 
   It implements horizontal and vertical filters designed to (slightly)
   reverse previous efforts at softening or edge enhancment that are
   common (but ugly) in DVD mastering. *[YUY2]*
#. See also WarpSharp, Xsharpen, and Unsharp Mask in the `Misc
   Plugins <#MiscellaneousPlugins>`__ section, below.

**Resizers:**

#. `Lanczos resize filter (Implemented by
   Nic) <http://nic.dnsalias.com/lanczos3.zip>`__: Starting from v2.06
   AviSynth will have faster a built-in lanczos3 resizer. *[YUY2, RGB]*
#. `SimpleResize plugin (by Tom
   Barry) <http://www.trbarry.com/SimpleResize.zip>`__: Very simple and
   fast two tap linear interpolation.  It is unfiltered which means it
   will not soften much. *[YUY2]*

**Subtitles:**

#. `VobSub plugin (by Gabest) <http://vobsub.edensrising.com/>`__: A
   plugin for importing your subtitles. *[YUY2, RGB]*

**MPEG Decoder (source) Plugins:**

#. `"MPEG2DEC" (by
   dividee): <http://users.win.be/dividee/avisynth.html>`__ Mpeg2dec is
   a plugin which enables AviSynth to import MPEG2 files.
#. `"MPEG2DEC2" (by Tom
   Barry) <http://www.trbarry.com/MPEG2DEC2.zip>`__: A MPEG2DEC.DLL
   substitute.  It is the same MPEG2DEC.DLL with SSE2 optimization.
   Faster with Pentium IV CPU.
#. `"MPEG2DEC3" (by Marc
   FD) <http://forum.doom9.org/showthread.php?s=&threadid=44308>`__: A
   MPEG2DEC.DLL modification with deblocking and deringing,
   `discussion <http://forum.doom9.org/attachment.php?s=&postid=185758>`__.
#. `"MpegDecoder" (by Nic) <http://nic.dnsalias.com/MPEGDecoder.zip>`__:
   A MPEG2DEC.DLL substitute.  Can also read MPEG-2 Transport Streams
   (VOB) and works very quickly.

**MPA Decoder (source) Plugins:**

#. `MPASource (by
   Warpenterprises): A
   mp1/mp2/mp3 audio decoder plugin,
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=41435>`__.

| **Broadcast Video Plugins:**
| *These are meant to take care of various problems which show up when
  over the air video is captured.  Some help with luma/chroma separation,
  others reduce interference problems or compensate for overscan.*

#. `AntiBlink (by
   Kurosu) <http://forum.doom9.org/showthread.php?s=&threadid=33319>`__:
   Tries to diminish shimmering (rainbow effects) in areas with sharp
   changes in luminance (for instance, letters). *[YUY2]*
#. `Guava Comb (by Lindsey
   Dubb) <http://students.washington.edu/ldubb/computer/GuavaComb.zip>`__:
   This is a comb filter, meant to get rid of rainbows, dot crawl, and
   shimmering in stationary parts of an image.
   `documentation <http://students.washington.edu/ldubb/computer/Read_Me_Guava_Comb.rst>`__;
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=37456>`__\ *[YUY2]*
#. `Ghostbuster (by
   SansGrip) <http://forum.doom9.org/showthread.php?s=&threadid=35339>`__:
   This filter removes "ghosts" from a clip.  A ghost in this context is
   a faint copy of the picture offset horizontally.  It works by either
   subtracting or adding the image from itself at the specified offset. 
   This filter is based on Krzysztof Wojdon's
   `Exorcist <http://www.republika.pl/vander74/virtualdub/exorcist.zip>`__
   VirtualDub filter. *[YUY2]*
#. `BorderControl plugin (by Simon
   Walters) <http://www.geocities.com/siwalters_uk/bdrcntrl.html>`__:
   After capturing video you might want to crop your video to get rid of
   rubbish.  BorderControl enables you to smear added borders instead of
   adding solid borders preventing artefacts between picture and border.
   *[YUY2]*
#. `AutoCrop plugin (by
   CropsyX) <http://www.videofringe.com/autocrop/>`__: Automatically
   crops black borders from a clip.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=37204>`__\ *[YUY2]*

**Misc Plugins:**

#. `ImageSequence plugin (by
   Bzzz2) <http://forum.doom9.org/showthread.php?s=&threadid=26855>`__:
   A plugin that lets you open image sequences.
#. `Robust duplicate frame detector "Dub" (by Donald
   Graft) <http://neuron2.net/mine.html>`__: This filter reduces the
   size of anime movies by "removing" duplicated frames. *[YUY2]*
#. `Tweak plugin (by Donald
   Graft) <http://shelob.mordor.net/dgraft/mine.html>`__: Adjusts hue,
   saturation, brightness, and contrast.  This is a built in function
   starting with AviSynth v2.01. *[YUY2]*
#. `WarpSharp, Xsharpen, UnsharpMask, KenKunNR, KenKunNRT, UVTimingH,
   UVTimingV, LoadAviUtlInputPlugin, LoadAviUtlFilterPlugin,
   ConvertYUY2ToAviUtlYC, ConvertAviUtlYCToYUY2, EraseGhost,
   SearchGhost, EraseGhostV, SearchGhostV, Auto24FPS, AutoDeint,
   FrameCache, AVIEncodeVideo, LoadPlugin (by
   ???) <http://forum.doom9.org/showthread.php?s=&threadid=34076>`__:
   Ported VirtualDub filters and AviUtl filters. Last version can be
   found
   `here <http://www.geocities.co.jp/SiliconValley-PaloAlto/2382/>`__.
   *[YUY2]*
#. `AviSynth monitor "avsmon" (by
   johann.Langhofer) <http://forum.doom9.org/showthread.php?s=&threadid=32125&pagenumber=4>`__:
   This plugin enables you to preview the video during the conversion
   and to determine the exact audio delay.\ *[YUY2, RGB ?]*
#. `MergeLuma/MergeChroma plugin (by Klaus
   Post) <http://cultact-server.novi.dk/kpo/avisynth/merge_as.html>`__:
   This plugin is a built in function starting with AviSynth v2.01.
   *[YUY2]*
#. `Call (by
   Nic) <http://forum.doom9.org/showthread.php?s=&threadid=46506>`__: A
   plugin which enables you to call and pass parameters to a external
   commandline program like Besweet.
#. `Blockbuster (by
   SansGrip) <http://www.jungleweb.net/~sansgrip/avisynth/>`__: With
   this filter one can use several methods to reduce or eliminate DCT
   blocks: adding noise (Gaussian distributed), sharpening, or
   blurring.  Some discussion can be found
   `here <http://forum.doom9.org/showthread.php?s=&threadid=37135>`__.
   *[YUY2, RGB ?]*
#. `ChromaShift (by Simon
   Walters) <http://www.geocities.com/siwalters_uk/chromashift.html>`__:
   ChromaShift shifts the chrominance information to the right by two
   pixels to compensate for incorrect Y/UV registration. *[YUY2]*
#. `TurnLeft and TurnRight (by
   Warpenterprises) <http://forum.doom9.org/showthread.php?s=&threadid=44853>`__:
   Rotates your clip -90 or 90 degrees.  This plugin will is a built in
   function starting with AviSynth v2.51.\ *[RGB]*
#. `Chr.dll (by
   WarpEnterprises) <http://forum.doom9.org/showthread.php?s=&threadid=47972&pagenumber=2>`__:
   Let's you add ASCII CHaRacters and starting time.
#. `Spray (by
   WarpEnterprises) <http://forum.doom9.org/showthread.php?s=&threadid=49557>`__:
   It takes pixels from "nearby" and sprays them around, so you can
   spray pixel from outside the logo area randomly inside. *[RGB32]*
#. `Zoom "Pan/Zoom/Rotate" (by
   WarpEnterprises) <http://forum.doom9.org/showthread.php?s=&postid=283982>`__:
   A plugin for Pan/Zoom/Rotate your clip. *[RGB32]*
#. `MJPEGcorrect
   plugin <http://inmatrix.hoyty.com/mirror/mjpegcorrect.zip>`__: Luma
   (brightness) in MJPEG decoders is often decoded incorrectly to the
   YUV luma-range.  This is a special purpose plugin written to fix this
   issue with MJPEG videos,
   `description <http://www.inmatrix.com/articles/ivtcsynth1.shtml>`__.
   *[YUY2]*
#. Many VirtualDub filters, see section `S4: Importing filters from
   VirtualDub <#s4>`__. *[RGB32]*

Q3.5: Where can I download external filters for AviSynth v2.5x?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Most of them can be found in the AviSynth section at Doom9. But below
you will find links to most of them. If you know of a plugin which is
missing, please feel free to add it to the list using the "Edit this
document" link to the left. Most of these plugins work in YUY2. If you
can't find the plugin (the attachments are still disable), you can
download the plugins at
[`WarpEnterprises <http://www.avisynth.nl/users/warpenterprises/>`__\ ]
homepage.

| **Deinterlacing & Pulldown Removal:**
| *All PAL, NTSC, and SECAM video is interlaced, which means that only
  every other line is broadcast at each refresh interval.  Deinterlacing
  filters let you take care of any problems caused by this. IVTC (inverse
  telecine, aka pulldown removal) filters undo the telecine process, which
  comes from differences between the timing of your video and its original
  source.*

#. `rePal (by
   Bach) <http://forum.doom9.org/showthread.php?s=&threadid=48401>`__: A
   usefull plugin for doing a 30->25 IVTC conversion. It must be used in
   conjunction with a (smart)bob. It can be used when your source is PAL
   telecined material. *[YV12, YUY2]*
#. `Unblend (by
   Bach) <http://forum.doom9.org/showthread.php?s=&threadid=55019>`__: A
   plugin based on Warpenterprise's deblend algorithm and Neuron2's
   decimate code. It's for messed up NTSC->PAL conversions.\ *[YV12]*
#. `Decomb Filter package (by Donald
   Graft) <http://neuron2.net/mine.html>`__: This package of plugin
   functions for AviSynth provides the means for removing combing
   artifacts from telecined progressive streams, interlaced streams, and
   mixtures thereof. Functions can be combined to implement inverse
   telecine for both NTSC and PAL streams.
   `discussion <http://neuron2.net/ipw-web/bulletin/bb/viewtopic.php?t=56>`__\ *[YV12,
   YUY2]*
#. `Area based deinterlacer (by Donald
   Graft) <http://forum.doom9.org/showthread.php?s=&threadid=46161>`__:
   Port of the Virtuldub filter. *[RGB32]*
#. `DGBob (by Donald Graft) <http://neuron2.net/mine.html>`__: This
   filter splits each field of the source into its own frame and then
   adaptively creates the missing lines either by interpolating the
   current field or by using the previous field's data.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=55598>`__\ *[YV12,
   YUY2, RGB]*
#. `KernelDeint (by Donald Graft) <http://neuron2.net/mine.html>`__:
   This filter deinterlaces using a kernel approach. It gives greatly
   improved vertical resolution in deinterlaced areas compared to simple
   field discarding.
   [`discussion <http://neuron2.net/ipw-web/bulletin/bb/viewtopic.php?t=57>`__\ ].
   *[YV12, YUY2, RGB]*
#. `MultiDecimate (by Donald Graft) <http://neuron2.net/mine.html>`__:
   Removes N out of every M frames, taking the frames most similar to
   their predecessors.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=51901&perpage=20&pagenumber=2>`__\ *[YUY2]*
#. `Smoothdeinterlacer (recompiled by Donald
   Graft) <http://forum.doom9.org/showthread.php?s=&threadid=46161&pagenumber=2>`__:
   A port of the VirtualDub Smooth Deinterlacer filter. *[YUY2, RGB32]*
#. `Interpolation Bob (by
   kevina20723) <http://forum.doom9.org/showthread.php?s=&threadid=62142>`__:
   This filter works identically to the AviSynth built-in Bob filter
   except that it uses linear interpolation instead of bicubic resizing
   (C-plugin). *[YV12, YUY2]*
#. `SmartDecimate (by
   kevina20723) <http://forum.doom9.org/showthread.php?s=&threadid=60031>`__:
   It should be very good at handling irregular telecines, and will also
   handle hybrid clips fairly well without any excessive jerkiness or
   blurring (C-plugin).
   [`discussion <http://neuron2.net/ipw-web/bulletin/bb/viewtopic.php?t=61&start=50>`__\ ].
   *[YV12, YUY2]*
#. `TPRIVTC (by
   Kurosu) <http://forum.doom9.org/showthread.php?s=&threadid=44854>`__:
   It uses the IVTC information from Tsunami MPEG Encoder Project
   Files.\ *[YV12, YUY2]*
#. `Progressive Frame Restorer "PFR" (by Simon
   Walters) <http://www.geocities.com/siwalters_uk/pfravs.html>`__:
   Recover original progressive film frames that have undergone the
   telecine to NTSC 30fps to PAL 25fps process whilst trying to maintain
   correct temporal field order.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=49815>`__\ ].
   *[YV12, YUY2]*
#. `"IT" (by thejam79, recompiled by Donald
   Graft) <http://forum.doom9.org/showthread.php?s=&threadid=44872>`__:
   Inverse telecine plugin. `Translation of
   README <http://avisynth.nl/index.php/IT>`__.\ *[YUY2]*
#. `GreedyHMA (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   DScaler's Greedy/HM algorithm code to perform pulldown matching,
   filtering, and video deinterlacing.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=45995>`__\ *[YUY2]*
#. `Motion compensated deinterlace filter "TomsMoComp" (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__: This
   filter uses motion compensation and adaptive processing to
   deinterlace video source (not for NTSC film).
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=37915>`__\ *[YV12,
   YUY2]*
#. `UnComb IVTC (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   Filter for matching up even and odd fields of properly telecined NTSC
   or PAL film source video.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=52333>`__\ *[YV12]*
#. See also Auto24FPS and AutoDeint in the
   `MiscPlugins <#MiscellaneousPlugins2>`__ section below.

| **Spatio-Temporal Smoothers:**
| *These filters use color similarities and differences both within and
  between frames to reduce noise and improve compressed size.  They can
  greatly improve noisy video, but some care should be taken with them to
  avoid blurred movement and loss of detail.*

#. `PeachSmoother (by Lindsey
   Dubb) <http://forum.doom9.org/showthread.php?s=&threadid=58674>`__:
   An adaptive smoother optimized for TV broadcasts:
   [`documentation <http://students.washington.edu/ldubb/computer/Read_Me_Peach_Smoother.rst>`__\ ],
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=36575>`__\ ].
   The Peach works by looking for good pixels and gathering orange smoke
   from them. When it has gathered enough orange smoke, it sprinkles
   that onto the bad pixels, making them better. Works only on computers
   with SSE instructions (Athlons, Pentium 3 or 4, recent Celerons, or
   later). *[YUY2]*
#. `FluxSmooth (by
   SansGrip) <http://www.jungleweb.net/~sansgrip/avisynth/>`__:
   spatio-temporal smoother,
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=38296>`__\ *.
   [YV12]*
#. `MipSmooth filter (by
   Sh0dan) <http://forum.doom9.org/showthread.php?s=&threadid=63153>`__:
   It takes the source frame, and creates three new versions, each half
   the size of the previous. They are scaled back to original size. They
   are compared to the original, and if the difference is below the
   threshold, the information is used to form the final pixel. *[YV12]*
#. `SpatioTemporal Median Filter "STMedianFilter" (by Tom
   Barry) <http://www.trbarry.com/STMedianFilter.zip>`__: STMedianFilter
   is a (slightly motion compensated) spatial/temporal median
   filter.\ *[YV12, YUY2]*
#. `Convolution3DYV12 (by
   Vlad59) <http://forum.doom9.org/showthread.php?s=&threadid=49806>`__:
   Convolution3D is a spatio-temporal smoother, it applies a 3D
   convolution filter to all pixels of consecutive frames.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=38281>`__\ *[YV12]*

| **Spatial Smoothers:**
| *These use color similarities and differences within a frame to
  improve the picture and reduce compressed size. They can smooth out
  noise very well, but overly aggressive settings for them can cause a
  loss of detail.*

#. `Masked Smoother "MSmooth" (by Donald
   Graft) <http://neuron2.net/mine.html>`__: This filter is effective at
   removing mosquito noise as well as effectively smoothing flat areas
   in anime.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=43976>`__\ *[YV12,
   RGB32]*
#. `SmoothUV (by
   Kurosu) <http://kurosu.inforezo.org/avs/Smooth/index.html>`__: This
   filter can be used to reduce rainbows, as done by SmartSmoothIQ.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=60631>`__\ ].
   *[YV12]*
#. `VagueDenoiser (by
   Lefungus) <http://forum.doom9.org/showthread.php?s=&threadid=56871>`__:
   A simple denoiser that uses wavelets. *[YV12]*
#. `Deen (by Marc FD) <http://ziquash.chez.tiscali.fr/>`__: Several
   denoisers.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=41643>`__\ ]
   This filter can cause memory leaks, so use at your own risk. *[YV12]*
#. `eDeen (by Marc FD) <http://ziquash.chez.tiscali.fr/>`__: Spatial
   monster. This filter can cause memory leaks, so use at your own
   risk.\ *[YV12]*
#. `SmoothHiQ (recompiled by
   Richard) <http://forum.doom9.org/showthread.php?s=&threadid=45277>`__:
   *[YUY2]*
#. `2D Cleaner Noise Reduction filter
   "\_2DClenYUY2" <http://members.tripod.co.jp/kiraru2002/>`__ *[YUY2]*
#. Also see KenKunNR in the `Misc Plugins <#MiscellaneousPlugins2>`__
   section, below.

| **Temporal Smoothers:**
| *These filters use color similarities and differences between frames
  to improve the picture and reduce compressed size.  They can get rid of
  most noise in stationary areas without losing detail, but overly strong
  settings can cause moving areas to be blurred.*

#. `TemporalCleaner (by Jim Casaburi; ported to AviSynth by
   Vlad59) <http://forum.doom9.org/showthread.php?s=&threadid=37620&perpage=20&pagenumber=3>`__:
   A simple but very fast temporal denoiser, aimed to improve
   compressibility. *[YV12]*
#. `Grape Smoother (by Lindsey
   Dubb) <http://forum.doom9.org/showthread.php?s=&threadid=58674>`__:
   [`documentation <http://students.washington.edu/ldubb/computer/Read_Me_Grape_Smoother.rst>`__\ ],
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=37196>`__\ ].
   When colors change just a little, the filter decides that it is
   probably noise, and only slightly changes the color from the previous
   frame. As the change in color increases, the filter becomes more and
   more convinced that the change is due to motion rather than noise,
   and the new color gets more and more weight. *[YUY2]*
#. `atc (by Marc FD) <http://ziquash.chez.tiscali.fr/>`__: Temporal
   cleaner.\ *[YV12]*
#. `Chroma Noise Reducer "Cnr2" (by Marc
   FD) <http://forum.doom9.org/showthread.php?s=&threadid=44500>`__:
   Reduces the noise on the chroma (UV) and preserves the luma (Y),
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=29529&pagenumber=2>`__\ ]
   *[YV12, YUY2]*
#. `Dynamical Noise Reduction 2 filter
   "DNR2" <http://members.tripod.co.jp/kiraru2002/>`__ *[YV12]*
#. Also see KenKunNRT in the `Misc Plugins <#MiscellaneousPlugins2>`__
   section, below.

| **Sharpen/Soften Plugins:**
| *These are closely related to the Spatial Smoothers, above.  They
  attempt to improve image quality by sharpening or softening edges.*

#. `MSharpen (by Donald Graft) <http://neuron2.net/mine.html>`__: This
   plugin for Avisynth implements an unusual concept in spatial
   sharpening. Although designed specifically for anime, it also works
   quite well on normal video. The filter is very effective at
   sharpening important edges without amplifying noise.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=42839>`__\ *[YV12,
   YUY2, RGB]*
#. `asharp (by MarcFD) <http://ziquash.chez.tiscali.fr/>`__: adaptive
   sharpening filter,
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=38436>`__\ ]
   *[YV12]*
#. `Unfilter plugin (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__: This
   filter softens/sharpens a clip.  It implements horizontal and
   vertical filters designed to (slightly) reverse previous efforts at
   softening or edge enhancment that are common (but ugly) in DVD
   mastering.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=28197&pagenumber=3>`__\ ]\ *[YV12,
   YUY2]*
#. See also WarpSharp, Xsharpen, and Unsharp Mask in the `Misc
   Plugins <#MiscellaneousPlugins2>`__ section, below.

**Resizers:**

#. `bicublinresize (by Marc FD) <http://ziquash.chez.tiscali.fr/>`__:
   This is a set of resamplers: FastBilinear (similar to tbarry's
   simpleresize), FastBicubic (an unfiltered Bicubic resampler) and
   Bicublin (uses bicubic on Y plane and bilinear on UV planes).
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=43207>`__.
   *[YV12]*
#. `ReduceBy2 replacement for TMPGEnc (by
   scmccarthy) <http://forum.doom9.org/showthread.php?s=&postid=378363>`__:
   This filter is only useful as a replacement for ReduceBy for users
   who need to convert to the RGB color space anyway. It avoids the
   interpolation of the chroma planes needed to convert to RGB by
   resizing the luma plane instead. *[RGB]*
#. `SimpleResize (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__: Very
   simple and fast two tap linear interpolation.  It is unfiltered which
   means it will not soften much. *[YV12, YUY2]*
#. `YV12InterlacedReduceBy2 (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   InterlacedReduceBy2 is a fast Reduce By 2 filter, usefull as a very
   fast downsize of an interlaced clip.
   [`discussion <http://forum.doom9.org/showthread.php?s=&postid=271863>`__\ ]\ *[YV12]*

**Subtitles:**

#. `VSFilter (by Gabest) <http://www.sf.net/projects/guliverkli>`__: For
   the subtitle fans!
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=41196>`__\ ]

**MPEG Decoder (source) Plugins:**

#. `MPEG2DEC (by
   dividee) <http://forum.doom9.org/showthread.php?s=&threadid=42301>`__
   Mpeg2dec is a plugin which lets AviSynth import MPEG2 files. (outputs
   to YUY2)
#. `MPEG2DEC3 (by Marc FD and
   others) <http://forum.doom9.org/showthread.php?s=&threadid=53164>`__:
   A MPEG2DEC.DLL modification with deblocking and deringing. Note that
   the colorspace information of dvd2avi is ignored when using mpeg2dec.
#. `Mpegdecoder (by Nic) <http://nic.dnsalias.com/MPEGDecoder.html>`__:
   This DLL lets you load VOB/MPEG-2/MPEG-1 files to be loaded directly
   into AviSynth.
   `discussion <http://forum.doom9.org/showthread.php?s=&postid=240354#post240354>`__.

**MPA Decoder (source) Plugins:**

#. `evilMPASource (by
   Nic) <http://forum.doom9.org/showthread.php?s=&threadid=53164&perpage=20&pagenumber=12>`__:
   MPASource with MPEG1/2 input support.
#. `MPASource (by
   Warpenterprises) <http://members.aon.at/archi/warpenterprises>`__: A
   mp1/mp2/mp3 audio decoder plugin,
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=41435>`__.

**Plugins to compare video quality using specific video quality metrics:**

#. `SSIM (by
   Lefungus) <http://forum.doom9.org/showthread.php?s=&threadid=61128>`__:
   Filter to compare video quality (similar as psnr, but using a
   different video quality metric). *[YV12]*
#. `VqmCalc (by
   Lefungus) <http://forum.doom9.org/showthread.php?s=&threadid=61128>`__:
   Filter to compare video quality (similar as psnr, but using a
   different video quality metric). *[YV12]*

| **Broadcast Video Plugins:**
| *These are meant to take care of various problems which show up when
  over the air video is captured.  Some help with luma/chroma separation;
  Others reduce interference problems or compensate for overscan.*

#. `Super8Equal (by
   Belgabor) <http://forum.doom9.org/showthread.php?s=&threadid=48951>`__:
   One problem of the transfer of Super8 films to digital media is the
   inhomogenous brightness produced by projectors. Usually the brighness
   drops in a circular fashion from the center to the rim. This filter
   was written to counteract this problem. *[YV12, YUY2, RGB]*
#. `AutoCrop plugin (by
   CropsyX) <http://www.videofringe.com/autocrop/>`__: Automatically
   crops black borders from a clip.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=37204&pagenumber=2>`__.
   *[YV12, YUY2]*
#. `Declick (by Donald
   Graft) <http://forum.doom9.org/showthread.php?s=&threadid=52310>`__:
   Removes light horizontal clicks. *[YUY2]*
#. `Deflicker filter (by Donald Graft, port of the VirtualDub
   filter) <http://forum.doom9.org/showthread.php?s=&threadid=40293>`__:
   This filter corrects video that has frame luminance variations over
   time, what we might generically call flickering. *[YUY2]*
#. `Conditional Temporal Median Filter (by
   kevina20723) <http://forum.doom9.org/showthread.php?s=&threadid=57914>`__:
   Removes temporal noise in the form of small dots and streaks
   (C-plugin). *[YV12]*
#. `X-Logo (by
   Leuf) <http://forum.doom9.org/showthread.php?s=&threadid=56660>`__: A
   filter to remove logos. (Note there's an internal conversion to RGB32
   and back.) *[YV12, YUY2, RGB]*
#. `Guava Comb (by Lindsey
   Dubb) <http://forum.doom9.org/showthread.php?s=&threadid=58674>`__:
   This is a comb filter, meant to get rid of rainbows, dot crawl, and
   shimmering in stationary parts of an image.
   [`documentation <http://students.washington.edu/ldubb/computer/Read_Me_Guava_Comb.rst>`__\ ],
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=37456>`__\ ].
   *[YUY2]*
#. `FixVHSOversharp (by
   MrTibs) <http://www.geocities.com/mrtibsvideo/fixvhsoversharp.html>`__:
   Repairs the light and dark halos that follow high contrast edges
   found in VHS sources.
   [`discussion <http://www.kvcd.net/forum/viewtopic.php?t=3119>`__\ ].
   *[YUY2]*
#. `BorderControl (by Simon
   Walters) <http://forum.doom9.org/showthread.php?s=&threadid=45670>`__:
   After capturing video you might want to crop your video to get rid of
   rubbish.  BorderControl enables you to smear added borders instead of
   adding solid borders preventing artefacts between picture and border.
   *[YV12, YUY2]*
#. `FillMargins (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__: A
   similar filter as BorderControl.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=50132>`__\ ]
   *[YV12]*
#. `Reinterpolate411 (by Tom
   Barry) <http://www.trbarry.com/ReInterpolate411.zip>`__: It seems
   that even chroma pixels are just being duplicated in the MainConcept
   codec (NTSC). The new filter will help that by discarding the odd
   chroma pixels and recreating them as the average of the 2 adjacent
   even pixels.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=58294&pagenumber=2>`__\ ].
   *[YUY2]*

**Misc Plugins:**

#. `Imagesequence plugin (by Bzzz, modified by Warpenterprises and
   Sh0dan) <http://forum.doom9.org/showthread.php?s=&threadid=26855&pagenumber=2>`__:
   Let's you import image sequences like .TIF, .TGA and .JPG files
   (images need to be 24 or 32 bits per pixel). This plugin is built in
   starting from AviSynth v2.52, and it is called
   `ImageReader <corefilters/imagesource.rst>`__.
#. `Dup (by Donald Graft) <http://neuron2.net/mine.html>`__: This is
   intended for use in clips that have a significant number of duplicate
   content frames, but which differ due to noise. Typically anime has
   many such duplicates. By replacing noisy duplicates with exact
   duplicates, a bitrate reduction can be achieved.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=41850>`__\ *[YV12,
   YUY2]*
#. `Convert3d (by
   hanfrunz) <http://forum.doom9.org/showthread.php?s=&threadid=48842>`__:
   Converts interlaced 3D Movies (one field left, other field right
   picture) to anaglyph (red/cyan) format using photoshops
   "screen"-blend method. *[YUY2, RGB]*
#. `AviSynth monitor "avsmon" (by
   johann.Langhofer) <http://forum.doom9.org/showthread.php?s=&threadid=32125&pagenumber=4>`__:
   This plugin enables you to preview the video during the conversion
   and to determine the exact audio delay.\ *[YV12, YUY2 ?, RGB ?]*
#. `AVISynth C API (by
   kevina20723) <http://kevin.atkinson.dhs.org/avisynth_c/>`__:
   C-plugins must be loaded with LoadCPlugin using AviSynth v2.52 or
   older versions, and can also be loaded with LoadPlugin starting from
   AviSynth v2.53. Advice: keep this plugin outside your auto plugin
   loading directory to prevent crashes.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=58840>`__\ ].
#. `MaskTools (by
   Kurosu) <http://forum.doom9.org/showthread.php?s=&threadid=49892>`__:
   Some general mask tools. *[YV12]*
#. `Call (by
   Nic) <http://forum.doom9.org/showthread.php?s=&threadid=46506>`__: A
   plugin which enables you to call and pass parameters to an external
   commandline program like Besweet.
#. `AudioGraph (by Richard Ling, modified by
   Sh0dan) <http://forum.doom9.org/showthread.php?s=&threadid=59412>`__:
   Displays the audio waveform on top of the video. *[YUY2, RGB]*
#. `Blockbuster (by Sansgrip, recompiled by
   CruNcher) <http://forum.doom9.org/showthread.php?s=&threadid=44927>`__:
   With this filter one can use several methods to reduce or eliminate
   DCT blocks: adding noise (Gaussian distributed), sharpening, or
   blurring. *[YUY2]*
#. `ReverseFieldDominance (by
   Sansgrip) <http://www.geocities.com/siwalters_uk/fnews.html>`__:
   Reverses the field dominance of PAL DV.
   `discussion <http://forum.doom9.org/showthread.php?s=&threadid=46765&perpage=20&pagenumber=2>`__.
   *[YUY2, RGB]*
#. `ChromaShift (by Simon
   Walters) <http://www.geocities.com/siwalters_uk/chromashift.html>`__:
   ChromaShift shifts the chrominance information in any direction, to
   compensate for incorrect Y/UV registration. *[YUY2]*
#. `CompareYV12 (by
   Shalcker) <http://web.etel.ru/~shalcker/CompareYV12.zip>`__: YV12
   version of the internal filter "Compare".
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=58187>`__\ ].
   *[YV12]*
#. `SelectByString (by
   stickboy) <http://forum.doom9.org/showthread.php?s=&threadid=60532>`__:
   This filter can be used to create wrapper functions to specify
   presets to other filters (C-plugin). *[YV12, YUY2, RGB]*
#. `AddGrain (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   AddGrain generates film like grain or other effects (like rain) by
   adding random noise to a video clip. This noise may optionally be
   horizontally or vertically correlated to cause streaking. *[YV12]*
#. `BT709ToBT601 (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   Converts HDTV (BT.709) to SDTV (BT.601) color space.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=50588>`__\ ]
   *[YV12]*
#. `DctFilter (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   Reduces high frequency noise components using Discrete Cosine
   Transform and its inverse.  Results in a high compressibility gain,
   when it is used at the end of your script.  Height/width must be a
   multiple of 16.
   `discussion <http://forum.doom9.org/showthread.php?s=&postid=252451>`__.
   *[YV12, YUY2]*
#. `FrameDbl (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__: A
   motion compensated frame doubler, made from STMedianFilter.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=56036>`__\ ]
   *[YV12]*
#. `Undot (by Tom
   Barry) <http://mywebpages.comcast.net/trbarry/downloads.rst>`__:
   UnDot is a simple median filter for removing dots, that is stray
   orphan pixels and mosquito noise.  It basicly just clips each pixel
   value to stay within min and max of its eight surrounding neigbors.
   [`discussion <http://forum.doom9.org/showthread.php?s=&postid=205442#post205442>`__\ ].
   *[YV12, YUY2]*
#. `Chr (by
   WarpEnterprises) <http://forum.doom9.org/showthread.php?s=&threadid=47972&pagenumber=2>`__:
   Let's you add ASCII CHaRacters and starting time. This plugin will be
   a built-in function starting from v2.52.
#. `DVinfo (by
   WarpEnterprises) <http://forum.doom9.org/showthread.php?s=&threadid=61688>`__:
   This filter grabs the timestamp and recording date info out of a
   DV-AVI. It should work with Type-1 and Type-2, standard AVI and
   openDML.
#. `Zoom "Pan/Zoom/Rotate" (by
   WarpEnterprises) <http://forum.doom9.org/showthread.php?s=&postid=283982>`__:
   A plugin for Pan/Zoom/Rotate your clip. *[RGB32]*

.. _JapanesePlugin:

WarpSharp, Xsharpen, UnsharpMask, KenKunNR, KenKunNRT, UVTimingH, UVTimingV,
LoadAviUtlInputPlugin, LoadAviUtlFilterPlugin, ConvertYUY2ToAviUtlYC,
ConvertAviUtlYCToYUY2, EraseGhost, SearchGhost, EraseGhostV, SearchGhostV,
Auto24FPS, AutoDeint, FrameCache, AVIEncodeVideo, LoadPluginEx (`by our Japanese
friend) <http://www.geocities.co.jp/SiliconValley-PaloAlto/2382/>`__:
Ported VirtualDub filters and AviUtl filters. Some documentation can
be found
[`here <http://forum.doom9.org/showthread.php?s=&threadid=34076>`__\ ].
You need to copy the
[`msvcp71.dll/msvcr71.dll <http://www.geocities.com/wilbertdijkhof/71.cab>`__\ ]
(Microsoft C Runtime Library, v7) to your windows system directory.
*[YV12, YUY2]*


Q3.6: Where can I download utilities for AviSynth?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Several utilities are available:

-  `AvsCompare (by TheWEF and
   aquaplaning) <http://aquaplaning.20m.com/>`__: This is a little tool
   to compare video material and/or the effect of choosen AviSynth
   filters.
   [`discussion <http://forum.doom9.org/showthread.php?s=&threadid=40675>`__\ ]
-  `AvsTimer (by
   kassandro) <http://forum.doom9.org/showthread.php?s=&threadid=56090>`__:
   A small filter with virtually no overhead, which allows one to
   measure the performance of plugins or groups of plugins.
-  `AVISynth
   BatchScripting <http://sourceforge.net/projects/avsbatches>`__: A
   little Batch file for creating fastly "AVS AviSynth Script files".
   With available presets: 1:1-VGA to VCD, DVB/DVD-PAL to 1:1-VGA and
   DVB/DVD-PAL to VCD. (Batches runs under WinNT/2000/XP only)


Q3.7: How do I convert between the colorspaces?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: If you are using mpeg2dec3 (the appropriate one for AviSynth v2.5x)
you can also use the conversions available in this dll (for example when
you want to convert to RGB24).  Using AviSynth itself:

| *converting to YV12:*
| `ConvertToYV12 <corefilters/convert.rst>`__

| *converting to YUY2:*
| `ConvertToYUY2 <corefilters/convert.rst>`__

| *converting to RGB:*
| `ConvertToRGB <corefilters/convert.rst>`__

Note that converting between colorspaces isn't completely lossless,
and doing several conversions back and forth may degrade your signal. 
The first conversion back and forth does not hurt your source, but if
you use three or more, it may.  Starting with version v2.03, there is a
`ConvertBackToYUY2 <corefilters/convert.rst>`__ which offers better
symmetry if your RGB source was previously converted from YUY2.

Q3.8: What/when do I care when filter X works in RGB- or YUV-space?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: The main reason why you should care is the improvement in speed you
can obtain by not unnecessarily changing between colorspaces.  If your
source is YV12 (when encoding DVD's for example, or captures from
digital sources) try to use only filters/plugins which work with YV12
input.  On the other hand if your source is in RGB (for example from
analog captures) try to use only filters/plugins which work in
RGB-space.

Speed is also quite different between the different colorspaces, because
each colorspace takes up different amounts of memory.  The slowest
colorspace is usually RGB24, because every pixel has an odd alignment in
memory, avoid using this mode.  The fastest mode is usually YV12
(followed by YUY2), because data takes less than half as much space as
RGB32.  So if you have to process your video a lot, try using
ConvertToYV12 or `ConvertToYUY2 <corefilters/convert.rst>`__ before you
do your filtering.  Note that `ConvertToRGB <corefilters/convert.rst>`__
converts to RGB32 if the source is YV12/YUY2 - use
`ConvertToRGB32 <corefilters/convert.rst>`__ to force a RGB24 to RGB32
conversion.

You should also consider your destination colorspace.  If you plan on
converting to DivX/XviD/Huffyuv in VirtualDub without applying filters
in VirtualDub, "Fast Recompress" will deliver the YUY2-data (or YV12
data if you use VirtualdubMod) directly to the codec, saving you another
colorspace conversion.  On the other hand, if you plan using TMPGEnc or
VirtualDub in "Full Processing" mode, you may consider delivering the
source as RGB.

Q3.9: How do I use and where can I get the "Subtitler" and "BMP Loader" plugins?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: These dll files are created by DVD2SVCD and only DVD2SVCD is using
them. But you can also use them in AviSynth. Have a look in this
[`thread <http://forum.doom9.org/showthread.php?s=&threadid=23296>`__\ ].

S4: Importing filters from VirtualDub
-------------------------------------

Q4.1: Where can I download the latest version of scripts which import filters from VirtualDub?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: The AviSynth scripts are on the
`Shared_functions <http://www.avisynth.nl/index.php/Shared_functions>`__
page, or you can download a package called vdub\_filtersv15.zip from
`<http://forum.doom9.org/showthread.php?s=&threadid=23804>`__
or `<http://neuron2.net/hosted.html>`__

Q4.2: Which filters are imported?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Most filters.  Read the corresponding documentation available in the zip-file.

Q4.3: Do these scripts work in RGB-space or in YUV-space?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Only in RGB-space (RGB32).

Q4.4: How do I make such a script?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A: Example script (this VirtualDub filter can be downloaded from
`Donald's homepage <http://shelob.mordor.net/dgraft/>`__):

Smart Bob by Donald Graft:
::

    function VD\_SmartBob(clip clip, bool "show_motion", int "threshold", bool "motion_map_denoising")
        LoadVirtualdubPlugin("d:\bob.vdf", "_VD_SmartBob", 1)
        return clip.SeparateFields._VD_SmartBob(clip.GetParity?1:0,
     \  default(show_motion, false)?1:0, default(threshold, 10),
     \  default(motion_map_denoising, true)?1:0)
    }

The VirtualDub plugin is imported with the command
"LoadVirtualdubPlugin".  The first argument gives the path of the
plugin, the second argument the name for the plugin that will be used in
the script and the third argument is called the preroll.

The preroll should be set to at least the number of frames the filter
needs to pre-process to fill its buffers and/or updates its internal
variables.  This last argument is used in some filters like: SmartBob,
SmartDeinterlace, TemporalCleaner and others.  The reason is that due to
filtering architecture of Virtual Dub the future frames can't be
accessed by a filter.  Dividee reports: "In the "Add filter" dialog of
VirtualDub, some filters have a "Lag:" value in their description. I
think this is the value that must be used as preroll.  Unfortunately,
this indication is not always present.  In those cases you have to
guess."  Of course you can always ask the creator of the filter.

The first step is to find out the sequence of the arguments in the last
line where the clip is returned.  Configure the script in VirtualDub and
select "Save processing Settings" in the File Menu or press Ctrl+S. 
Open the created .vcf file with a text editor and you should see lines
like this:

| ``VirtualDub.video.filters.Add("smart bob (1.1 beta 2)");``
| ``VirtualDub.video.filters.instance[0].Config(1, 0, 10, 1);``

The order of the arguments is the one that has to be used in AviSynth. 
To find the role of the arguments, play with them in VirtualDub and
examine the resulting lines.

The second step is to test the filter and to compare it with the
VirtualDub filter itself.  For the programming itself you can learn a
lot by looking at the script which are already contained in
vdub_filters.avs.

Example script which uses the function VD_SmartBob:
::

    Import("d:\vdub_filters.avs")
    AviSource("d:\filename.avi")
    ConvertToRGB32 # only when necessary (but doesn't hurt)
    VD_SmartBob(1, 0, 10, 1)
    ConvertBackToYUY2 # only when necessary

$Date: 2025-02-21 18:02:36-05:00 $
