[linux-dvb] Re: Dolby Digital through DVB - How?

[Nico <nsabbi@libero.it>]

Robert Schlabbach wrote:

> Sorry for the stupid question, but a search on Google brought up _zero_
> technical details on this: How is "Dolby Digital" transmitted through 
> DVB?
>
> Looking at the PMT of the German "ProSieben", I find the following 
> streams:
>
> Program Map Table for SID 898:
> PCR is on PID 255
>
> Components:
>
> PID 255: MPEG-2 Video
> Stream Identifier: 1
>
> PID 256: MPEG-2 Audio (ISO/IEC 13818-3 Audio)
> Stream Identifier: 3
>
> PID 257: ITU-T Rec. H.222.0 | ISO/IEC 13818-1 PES packets containing
> private data
> unknown descriptor 0x6A: 00
> Stream Identifier: 17
>  
this one is AC3; DVB PSI states that ac3 streams can be in pids that in 
the PMT, in the ES loop,
have a type=0x6 (private) and one of the descriptors with type 0x6a.
And in other ways, too .....

> PID 32: ITU-T Rec. H.222.0 | ISO/IEC 13818-1 PES packets containing 
> private
> data
> Teletext descriptor: Language deu, initial Teletext page: 100
> Stream Identifier: 194
>
> PID 261: ITU-T Rec. H.222.0 | ISO/IEC 13818-1 private_sections
> unknown descriptor 0x6F:
>
> PID 262: ISO/IEC 13818-6 type B
> unknown descriptor 0x66: 00 f0 00 01
> unknown descriptor 0x13: 00 00 01 06
> unknown descriptor 0x14: 00 0e 00 00 08 ff ff ff ff ff ff ff ff
> Stream Identifier: 14
>
> Which of these PIDs carries the Dolby Digital stream, please? Is there an
> official document available on this? A search for "dolby" on ETSI.org
> brought up _nothing_
>
> And while I'm at it, does anyone know what that extra stream on MTV 
> Germany
> on Astra 19.2°E is:
>
> Program Map Table for SID 28653:
> PCR is on PID 3031
> Components:
> PID 3031: MPEG-2 Video
> Stream Identifier: 1
>
> PID 3032: MPEG-1 Audio
> Stream Identifier: 2
>
> PID 3034: Teletext
> Teletext descriptor: Language eng, initial Teletext page: 100
> Stream Identifier: 4
>
> PID 33: User Private (0x81)
>
> Point is: I have a piece of software here that thinks PID 33 carries the
> audio. I think this is some mixup with ATSC where stream type 0x81 
> probably
> means AC-3 audio. But the stream is empty Anyone know what MTV Germany
> is broadcasting this empty stream for...?
>
> Regards,
> --
> Robert Schlabbach
> e-mail: robert_s@gmx.net
> Berlin, Germany
>
>
>
>  




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