[FFmpeg-user] mkv to avi errors

[Andrey Moshbear]

On Thu, May 26, 2011 at 20:05, Jon Drukman <jsd at cluttered.com> wrote:
> Rick C. <rickcorteza <at> gmail.com> writes:
>
>> Great thanks for the quick replies.  I actually thought lame could do surround
> (obviously I was wrong) or
>> either that FFmpeg would downmix it automatically (I guess not the case).  If
> I would specify -ac 2 then it
>> should work correct?
>>
>> And yes to avoid losing my surround I will go ac3.  Thank you!
>
> -ac 2 will give you a stereo mp3.  if you want to preserve the ac3, just use
> -acodec copy.

>From my experience, avi (xvid) files and AAC do not mix.
Transcoding AAC -> AC3 will be more reliable than leaving AAC as is. I
know for a fact that DivX DVD players,
and the Xbox 360, both require AC/3 for 5.1 in avi file.