[FFmpeg-devel] Channel layouts for aac encoding/decoding and vorbis decoding

Jason Tackaberry tack
Mon Aug 10 15:21:17 CEST 2009

On Mon, 2009-08-10 at 11:45 +0200, Benjamin Larsson wrote:
> The internal ffmpeg channel order that is used is based on the wav file
> order.
> http://msdn.microsoft.com/en-us/library/ms713496(VS.85).aspx

Which, for 6 channels at least, is the same as the SMPTE-ITU-R order.
But the order defined by Microsoft seems to be more thorough, so it's
good to know that's the reference.

Now, when you say "internal," do you mean "completely transparent to the
API caller?"  Because I'm more inquiring about the order that is visible
to me as the user of the API (and specifically which layout goes into
and comes out of AAC and Vorbis codecs).


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