[FFmpeg-devel] Codec IDs for AC3/DTS variants (Was: Re: [RFC] additinaldesc_type for dtshd mpeg-ts demuxer)

[Michael Niedermayer]

On Tue, Jun 10, 2008 at 09:36:33AM +0200, Benjamin Larsson wrote:
> Andreas ?man wrote:
> > Benjamin Larsson wrote:
> >   
> >> elupus wrote:
> >>     
> >>>>> Yes, we need to/should add support for spdif  output/pass through.
> >>>>>       
> >>>>>           
> >>>> That would be entirely up to the calling application to handle.  All I'm
> >>>> asking that such all application be given enough information to make the
> >>>> right choice.
> >>>>
> >>>>     
> >>>>         
> >>> It's actually more the job of an encoder / bitstream filter. You need to add a 
> >>> S/PDIF header to the data, and padd to a certain length. Demuxer should never 
> >>> output S/PDIF'ed data, but sure a AC3_SPDIF, DTS_SPDIF, AAC_SPDIF, WMA_SPDIF 
> >>> codec id's could be nice to have.
> >>>   
> >>>       
> >> Don't forget mpeg audio over spdif. Btw we have figured out how to send 
> >> wmapro over spdif if you are interested.
> >>
> >>     
> >
> > Btw, does anyone know how to send AAC over SPDIF? I think i've seen
> > AV receivers that claim to support it at least.
> >
> > Perhaps we should add a output muxer format "IEC958" that generates
> > SPDIF output, I've been thinking about that previously..
> >   
> 
> I'm not sure that will work. Wmapro needs/can use parameters from the 
> asf container and the packets need to be split into frames. So in that 
> case it would be better if the decoder could get a spdif generation 
> function.

a solution with a muxer or bitstream filter would be much cleaner ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The misfortune of the wise is better than the prosperity of the fool.
-- Epicurus
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