[Ffmpeg-devel] Encoding multichannel audio with ffmpeg

[Alessandro Grassi]

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?

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