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