[theora-dev] Multiplexed Ogg and header problems.

Dan Miller dan at on2.com
Sun Nov 10 08:05:01 PST 2002

hi Alejandro --
I'm not really an expert in OGG.  Monty will have to make this decision.  I can contribute knowledge about, and perhaps some code that demonstrates, multiple stream switching during playback, but it's up to the Xiph guys how they want to make that work inside their format.

        -----Original Message----- 
        From: Alejandro G. Belluscio [mailto:baldusi at uol.com.ar] 
        Sent: Sat 11/9/2002 12:29 PM 
        To: Dan Miller 
        Subject: Re[2]: [theora-dev] Multiplexed Ogg and header problems.

        Hello Dan,
          I've been thinking a bit about this. And may be we could come up
          with an XML based definition for this things. Each stream should be
          identified by it's serial number and have a description of it's
          type. We then encapsulate this in an ogg file and concatenate it
          _before_ the multiplexed file. It's kind of custom header file. Is
          this too much against the idea of ogg encapsulating?
        Alejandro Belluscio
        Friday, November 08, 2002, 4:33:51 PM, you wrote:
        DM> good question. We have this functionality in our On2 server
        DM> platform (TrueCast). It works great for limited/variable bandwidth
        DM> situations ie internet at say 150 - 400 kbits/sec. Would love to
        DM> see this in OGG.
        DM> -----Original Message-----
        DM> From:   Alejandro G. Belluscio [mailto:baldusi at uol.com.ar]
        DM>   I there was a discussion on the vorbis list about Real Audio
        DM>   SureStream (tm) format. The basic idea was that they put multiple RA
        DM>   files with different compression levels. So when they have to switch
        DM>   the bit rate due to bandwidth changes, they choose from the streams
        DM>   they have. Since peeling is a long time away, it could be implemented
        DM>   with ogg vorbis multiplexing several times the same file with
        DM>   different compression levels. My question (and I think Monty can
        DM>   answer it) is how should the the presence of multiple concurrent
        DM>   vorbis streams be handled. Because if you have multiple audio tracks
        DM>   for a movie, or you have multiple compression rates it's very similar.
        DM>   The only problem seems to identify what's each of those streams for.
        DM>   In other word, how should I know that stream A is Swahili and stream B
        DM>   is Speranto, or that stream A is the -q3 compressed and Stream B is
        DM>   the -q1 compressed?
        --- >8 ----
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