[FFmpeg-devel] PATCH: 5.1 AAC SMPTE channel order with libfaad

Jean-Yves Avenard jyavenard
Tue Apr 6 04:44:47 CEST 2010


On 6 April 2010 07:36, John Stebbins <stebbins at jetheaddev.com> wrote:
> When downmixing and reordering are both required, the reorder is applied
> to the downmix matrix during initialization, so downmix and reorder are
> performed simultaneously by the matrix multiplication that does the
> heavy lifting. There is a separate function available if reorder only is
> needed.

This is very cool stuff ...

I may re-use this code in MythTV ...

I could take the whole re-order / downmix ; completely outside of
ffmpeg ... Would be much easier that way...

That advantage of doing it in ffmpeg within the codec obviously is
that there's one less read/copy ; so will always be a bit faster than
when done outside

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