[vorbis-dev] Update on Vorbis RTP I-D
giles at xiph.org
Tue Feb 11 05:39:49 PST 2003
On Tuesday, February 11, 2003, at 12:57 pm, Phil Kerr wrote:
> Keeping it at 64k gives us extra headroom if needed and I'll adjust the
> text at the start of the I-D to highlight this. Should the main Vorbis
> documentation make a note of this?
I would agree that 64k is a save compromise.
The vorbis documentation will certainly include the rtp profile
(already does, actually) but yes, once issues like this are finalized,
a note about the restriction should be added to the main text.
>> Codebook delivery is, of course, the largest problem in terms of
>> implementations. Perhaps have multiple methods with flag(s) to
>> indicate which
>> are available for a specific stream?
> That's sort of built-in now with the VORB message, the overflow and
> SDP. I've been discussing the TCP option with one of the AVT guys and
> although the specs for this delivery mechanism are available they are
> not 100% developed and work is still ongoing in this area. This method
> would provide the reliable solution we need. Any further ideas in this
> area would be welcomed.
One (not new) idea that I've liked is to add a 'codebooks by reference'
feature to vorbis, where instead of transmitting actual codebooks,
there's an entry with e.g. a checksum or hash of the codebooks (for
both verification and cache lookup) and a pointer to where they can be
retrieved if the decoder doesn't already have them. In an host-based
application, I could imagine this working very well where the pointer
is just a url where the headers can be retrieved over normal TCP.
Given the state of things, I would reinterate Mike's suggestion that we
leave room for a variety of methods.
> I don't think it's essential but it can be useful to specify which
> the server will bind to. It certainly helps with firewalls and network
It seems to me these requirements are more relevent to rtp-streamed
media in general. What do quicktime and realaudio use?
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