[FFmpeg-devel] [PATCH] aacdec: add support for dual mono in Japanese DTV

Michael Niedermayer michaelni at gmx.at
Fri Aug 24 04:26:49 CEST 2012

On Wed, Aug 22, 2012 at 10:57:03AM +0900, Akihiro TSUKADA wrote:
> > so there is no way to distinguish dual mono from stereo and the user
> > has to set this for each program she wants to watch manually ?
> There is, at the level of MPEG TS system.
> Each audio PES is tagged by PMT and
> EIT describes the mapping from tag to encoding parameters
> including channel configuration.
> So those parameters are defined per program/show and
> can change over time. (PMT is usually fixed and does not change).
> TV receivers track EIT of the current station (TS, programID) and
> output either channel (defaulting to the left) or
> switch among them on user's request.

Is this information available to the TS demuxer ? If so it could
maybe be passed to the decoder via side data on AVPackets, this would
avoid the need to manually set it


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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