[FFmpeg-user] Audio stream won't play after remapping to remove unusable streams.

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Nov 22 12:57:46 CET 2013

Hans J. Albertsson writes:

> The below commands show an attempt at removing a 
> voice-over russian dubbed audio stream (0:1) from an avi 
> file, so that the other, japanese, audio stream will be 
> the default.
> It won't work: the resulting file, which to me seems 
> good, judging from what ffmpeg -i OUT.avi says, will 
> come up as "unsupported audio" in all my media players.

Including MPlayer and WMP?


> ffmpeg version 1.1.2 Copyright (c) 2000-2013 the 
> FFmpeg developers

(Unrelated: This is too old.)

>      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 
> 48000 Hz, 5.1(side), fltp, 448 kb/s

I can only guess but since this was asked before, 
it is a good guess:
The Microsoft specification for avi explains how 
multichannel ac3 should be muxed, FFmpeg follows 
the recommendation, some media player demand an 
implementation that does not confirm to the 

Since I am guessing, please feel free to continue 
testing and report back here:
Update FFmpeg (and vlc and MPlayer), test both 
multichannel and stereo ac3, test both remuxing and 
reencoding and report back here.

Carl Eugen

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