[FFmpeg-user] Dropping audio streams confuses vlc?

hcoin hcoin at quietfountain.com
Mon Apr 1 19:32:04 CEST 2013

On 4/1/2013 11:45 AM, Andrey Aleksandrovich wrote:
> On 4/1/13, hcoin <hcoin at quietfountain.com> wrote:
>> Hi all, thanks for ffmpeg!
>> I'm struggling to drop two of three audio streams from an mpeg2
>> audio+video source, and can't puzzle out my mistake.
>> I've given the following command on a mpeg2 file with one video and
>> three ac3 audio streams.  The source and all three streams play
>> perfectly on vlc.   I want the result to be exactly what was input,
>> except with one audio stream: only the second of the three in the
>> original.   But, when I give the command the result is a file which when
>> played in vlc shows around 56 or so audio streams, and otherwise
>> produces no sound whatever, though the picture is correct.   Am I making
>> some newbie mistake?
>> ffmpeg -i sourcevid.mpg -vcodec copy -acodec copy  outvid.mpg -map 0.0
>> -map 0.2
>> ffmpeg -i sourcevid.mpg -vcodec copy -acodec copy  outvid.mpg -map 0.0
>> -map 0.2 -ac 1
>> Both cases process normally, showing the entire and correct length, then
>> exiting.  Yet - no sound on playback.
>> I tried it on freebsd 9.1 release, and I tried it on debian wheezy (0:0
>> and 0:2 instead of 0.0 and 0.2) --  same result.  What have I overlooked?
>> Thanks!
>> Harry
> Try this:
> ffmpeg -i INPUT.file -vcodec copy -acodec copy -map 0:0 -map 0:2 OUTPUT.file
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Thanks for the quick response.   The ffmpeg processing was normal. The 
video was normal.  vlc reports 26 audio streams.  No sound was 
produced.  Same as before, basically, though the number of audio streams 
in the output file (which should be 1) is 26 instead of 50 something on 
my prior run.   Actually I checked it again during the same vlc 
playback, somehow the number of audio streams has grown to 72 now.    
mplayer too produces no sound.  Both vlc and mplayer work normally on 
the source mpg.

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