Re: ffmpeg encoding issues & AAC
On date Wednesday 2007-11-21 19:59:10 -0800, David Fox wrote:
> Guys,
>
> I do quite a bit of video encoding / audio encoding in debian lenny,
> and oftentimes I use tovid (tovid.sourceforge.net) to do the encoding,
> usually with good results.
>
> But recently I have had a problem with ffmpeg when I attempt to encode
> what looks like a 5.1 channel aac file that's part of an mp4 video, it
> tells me that it can't do the encode, that encoding more than 2
> channels is not supported. The upshot is that I may have to find
> another tool to extract the audio portion of the mp4 file, and then
> downmix it to two channels, then resample to ac3 dvd standard audio
> format.
You told it, ffmpeg can't still downmix (but that is a requested
feature, many related patches laying aroung ffmpeg-devel), so you have
to do it manually (for example using faad --downmix).
Check also the Gmane archive of ffmpeg-user where I recently discussed
that issue.
[...]
HTH, regards.
--
Stefano Sabatini
Linux user number 337176 (see http://counter.li.org)
Reply to: