[Ffmpeg-devel] Encoding multichannel audio with ffmpeg

[Michael Niedermayer]

Hi

On Mon, Nov 06, 2006 at 09:34:26PM +0100, Alessandro Grassi wrote:
> Hi, this is my first request to ffmpeg-devel. I hope you can help me.
> I want to encode multichannel audio with ffmpeg.
> I found that in ffmpeg.c at line 2968 encoding of formats other than AC3 
> and DTS is limited to stereo.
> If I try to allow 5.1 encoding in AAC or WAV format the channel order in 
> encoded files is wrong. For example, when decoding AC3 to WAV the channel 
> order of the AC3 is preserved in the WAV, while it requires a different 
> order.
> I found on the web that the right channel order forsome formats is this:
> AC3: LFE L C R SL SR
> WAV: L R C LFE SL SR
> AAC: C L R SL SR LFE
> To properly encode multichannel audio ffmpeg would need something to 
> correctly reorder channels depending on input and output formats.
> I don't know how to do that. Does someone?

write a audio filter layer for ffmpeg :)

you could of course hack ffmpeg.c too but that is not so ideal as it
would quickly become quite messy

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In the past you could go to a library and read, borrow or copy any book
Today you'd get arrested for mere telling someone where the library is