[FFmpeg-user] move from audio track to another

[juan carlos Rebate]

https://trac.ffmpeg.org/wiki/AudioChannelManipulation
here it is perfectly explained this in version 2.8 and earlier applies to
ffmpeg and ffmplay

2016-05-05 19:11 GMT+02:00 Moritz Barsnick <barsnick at gmx.net>:

> On Tue, May 03, 2016 at 16:23:58 +0200, juan carlos Rebate wrote:
> > >ffplay -i rtp://239.0.0.111:8208 -ac 0
>
> "-ac" selects the number (amount) of audio channels to output, as in
> "stereo to mono". I'm not even sure it applies to ffplay. And "-ac 0"
> doesn't make sense in that context.
>
> If you want to select a different audio *stream* to play (please note
> the semantic difference between channels and streams), you need to use
> the "-ast" option:
>
>   -ast stream_specifier  select desired audio stream
>
> You can also cycle through the available audio streams interactively at
> run time by pressing the 'a' key.
>
> Moritz
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