[FFmpeg-user] Question about audio

[Davor Josipovic]

On 6/09/2012 10:25, Stan Defawes wrote:
> Hello,
> Is it possible to convert à video stream (an mpeg1 stream in this case) and exclude the right audio canal ?
> I would like to conserve only  the left  audio canal and put it on the two canals in the result stream ??
> I search in -map direction but with no result and i'm not a specialist of ffmpeg command's line :)
> Thanks a lot for your help and all apologizes for my bad english
>
> Stanislas
>

Try channelmap filter. See the documentation: 
http://ffmpeg.org/ffmpeg.html#channelmap.