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Is there a tool for Mac OS X which supports cutting .AVI files, but doesn't re-compress them? Command-line tools are also welcome.

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up vote 4 down vote accepted

Install FFmpeg through Homebrew:

brew install ffmpeg

Then cut the video starting from the position specified with -ss for a duration specified with -t. copy ensures that video and audio are not re-encoded.

ffmpeg -i video.avi -c:v copy -c:a copy -ss 00:01:30 -t 0:0:20 output.avi
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The codec options belong after the input option, otherwise they mean, "treat this input as copy". FFmpeg more or less uses a pipeline syntax here. – slhck May 10 '12 at 5:51
Thanks @slhck. ffmpeg -i video.avi -vcodec copy -acodec copy -ss 00:40:35 -t 0:3:00 out.avi works great! – ohho May 10 '12 at 8:19
After a video is cut, the player (mplayer) can no longer jump to specific a time position. How to fix? – ohho May 10 '12 at 9:21

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