Vorbis dev - Nov 2002 - Chained streams and granule position

Hi!

I don't find any detailed information about this in the specification,
so I try a question here.

If two plain, unmultiplexed Ogg/Vorbis-files are chained into one 
file, you end up with an Ogg-file with two logical Vorbis streams.
When playing this file, would it be correct for a decoder to synchronize 
the two streams according to the granule position of the Ogg pages 
(playing them simultaneously), or should the streams be played separately 
and in order? Chaining Ogg files is explicitly allowed for Vorbis-
only-files, and in that case, it would be proper to play them after 
eachother. On the other hand, it makes sense to synchronize the streams 
according to their timestamps (granule position) too, or does this 
implicitly require a multiplexed (instead of chained) stream?

Tor


-- 
Tor-Einar Jarnbjo
IT Consultant, Itera Grosch & Link AG
Tel.: (0170) 222 54 38

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On Tuesday, November 12, 2002, at 03:59  pm, Tor-Einar Jarnbjo wrote:
> If two plain, unmultiplexed Ogg/Vorbis-files are chained into one
> file, you end up with an Ogg-file with two logical Vorbis streams.
> When playing this file, would it be correct for a decoder to 
> synchronize
> the two streams according to the granule position of the Ogg pages
> (playing them simultaneously), or should the streams be played 
> separately
> and in order?
The intent of the design is that chained streams should be played 
separately and in order. Streams to be played simultaneously (or 
concurrently) should be multiplexed.

  -r

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