\section{Multitrack input media in CMML}
\label{group__multitracks}\index{Multitrack input media in CMML@{Multitrack input media in CMML}}
With CMML it is possible to create markup for several, potentially interleaved, media files. This is specified in the {\bf stream} tag by giving several {\bf source} tags which each point to a media file. The \char`\"{}start\char`\"{} tag specifies at what time the media file should be inserted. In case of temporally overlapping media files they are regarded as interleaved files.

This is an example of such a specification: 

\footnotesize\begin{verbatim}
<stream basetime="npt:0">
  <import contenttype="video/x-theora" src="fish.ogg" start="npt:0"/>
  <import contenttype="audio/x-vorbis" src="fishsound.ogg" start="npt:0"/>
  <import contenttype="audio/x-speex" src="comments.spx" start="npt:7"/>
</stream>
\end{verbatim}
\normalsize
 