Determine which tracks to use from
ffmpeg -i inputvideo.avi
Extract the video track (0:0) and the second audio track (0:2) from the video file and copy to new file:
for %%a in (*.avi) do "ffmpeg" -i "%%a" -sn -map 0:0 -map 0:2 -vcodec copy -acodec copy "%%a".avi
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