I have a bunch of video files with 2 audio tracks. They are avi files. The audio tracks have no labels and when I try to play them the default track has no audio. There are 2 more tracks, the second is the one with audio.
Is there a command I could run that would remove tracks 1 and 3 from every file?
They are on a Ubuntu server. CLI only.
avprobe version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2007-2014 the Libav developers built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
[mpeg4 @ 0xd1dac0] Invalid and inefficient vfw-avi packed B frames detected
Input #0, avi, from 'Video004.avi': Metadata: encoder : VirtualDubMod 1.5.10.2 (build 2540/release) Duration: 00:49:16.99, start: 0.000000, bitrate: 1937 kb/s Stream #0.0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 640x480 [PAR 1:1 DAR 4:3], 23.98 tbn, 23.98 tbc Stream #0.1: Audio: mp3, 32000 Hz, 1 channels, s16p, 96 kb/s Stream #0.2: Audio: mp3, 32000 Hz, 1 channels, s16p, 96 kb/s Stream #0.3: Audio: mp3, 32000 Hz, 1 channels, s16p, 96 kb/s
# avprobe output2 Answers
avconv seems to be the solution
avconv -i $file -map 0:0 -map 0:2 -acodec copy -vcodec copy $outfileI put this into a loop
dir="*.avi"
for file in $dir
do avconv -i $file -map 0:0 -map 0:2 -acodec copy -vcodec copy $outfile
doneI did not try saving to the same file name but I assume it would not work. You can easily have this delete the old file and rename the new one. I just output to a temp directory with the same names and then moved them all overwriting the originals.
To explain The map arg. tells avconv what tracks to copy. 0:0 is the video and 0:2 is the second audio track. Then acodec and vcodec are set to copy meaning it copies the audio and video without changing it.
1Try this link. Scroll down until you reach Convert Mono Audio to Stereo and Vice Versa and try that. It allows you to turn a stereo track into a Mono track by choosing one of the channels.
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