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First post, so Hi, but anyway, am try to cut a video which has a video stream significantly shorter that the included audio tracks. I've tried this

REM Testing for loop
FOR %%m in (*.mkv) do (
REM Cut to video length
ffmpeg -i "%%m" -map 0:a? -map 0:s? -map 0:v -c:v copy -c:a copy -c:s copy -shortest "%%~nm_length.mkv"
echo ====================================================
)

but still end up with a video the same length and size as the original. I want the video to end when the actual video stream ends, but with all tracks just copied and no tracks dropped. I don't understand ffmpeg and am barely capable of more than copying others work. I have looked at the documentation though. Thanks.

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