[xiph-rtp] header caching and chaining

[Geoff Shang]

Hi,

I am not an expert on protocols, only a consumer with interest in this 
field.

Those of us using vorbis streams so far rely on the ability to chain 
streams for providing metadata updates.  So streaming title and artist 
information, etc.  Now I don't think we should lose this ability unless 
there's a good reason for losing it.  Whether this is the best mechanism 
for conveying this info is another question, and if it can be carried 
without support for chained bitstreams then I guess that's fine.

I do also like the idea of being able to change audio format, as it's a big 
plus over MP3, but I realise I'm a voice of 1 and may get shouted down on 
this one.  Icecast has this nice ability to switch to and from backup 
feeds, and I'd be concerned if this was not available in a future RTP mode.

I also presume that scaling down to a lower bitrate version of a stream due 
to bandwidth limitations might also be affected if chaining is not 
supported.

Just my thoughts,
Geoff.


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