[Ffmpeg-devel] [PATCH] ac3 decoder

Justin Ruggles jruggle
Sun Oct 1 22:44:09 CEST 2006

Benjamin Larsson wrote:
> Here is the patch with the ac3 decoder from SoC. Included is the patch
> to enable the sse imdct from Loren Merrit.
> MvH
> Benjamin Larsson

I have a question about the behavior of the ac3 decoder.  With the lgpl
decoder patch, it defaults to downmixing stereo to mono if '-ac 2' is
not specified, but does not downmix 5.1 by default.  This has to do with
the ac3 parser, but I can't tell right off if that was the intended
behavior.  If not, it's an easy fix.

I'm checking to see if this was the behavior of the liba52 decoder as
well, but I have to do a full source recompile, so my machine may take a
little while.  Either way, I think it's not good behavior to downmix
stereo to mono by default.  Or if so, at least make it consistant and
downmix all channel configurations to mono unless otherwise specified.


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