From a8848d466f5aead07cb8d848e228f00b26697ef0 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Wed, 1 Aug 2018 16:42:03 -0400
Subject: ffmpeg-rm-video: support multiple input files

---
 ffmpeg-rm-video | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/ffmpeg-rm-video b/ffmpeg-rm-video
index fde2cc6..f49d1d4 100755
--- a/ffmpeg-rm-video
+++ b/ffmpeg-rm-video
@@ -1,3 +1,38 @@
 #!/bin/sh
 
-ffmpeg -i "$1" -acodec copy -vn "$2"
+SELF="$( basename "$0" )"
+help() {
+	cat <<EOF
+Usage: $0 file [file ...]
+
+Remove video from combined video/audio files.
+
+Each file will be replaced with an audio-only copy, with the original
+filename. The original file will be renamed to end in .bak.
+
+$0 foo.mp4 bar.mp4
+
+...will create audio-only foo.mp4 and bar.mp4 files, and the original
+files will be kept as foo.mp4.bak and bar.mp4.bak
+
+Note that the output file will be of the same type as the input file. This
+script does NOT convert the audio to a .wav or whatever, so you end up
+with e.g. an .avi file with only audio (no video).
+
+This is most useful for .flac files, which include a single frame of video
+(a still image).
+EOF
+}
+
+if [ "$1" = "" -o "$1" = "--help" ]; then
+	help
+	exit 0
+fi
+
+for file in "$@"; do
+	ext="$( echo "$file" | sed 's,.*\.,,' )"
+	tmp="$$.$ext"
+	ffmpeg -i "$file" -acodec copy -vn "$tmp"
+	mv "$file" "$file.bak"
+	mv "$tmp" "$file"
+done
-- 
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