[xiph-rtp] Suggested changes to the Vorbis SDP attributes

[Ralph Giles]

On Sat, Oct 23, 2004 at 09:52:17PM +0200, Tor-Einar Jarnbjo wrote:

> With fragments of the discussion on the IETF mailing lists around the 
> last RFC draft, I suggest the following changes to the Vorbis-specific 
> SDP fields (the formatting of the SDP field descriptions is BTW broken 
> after converting the XML version to text or HTML):

Thanks for summarizing.

> b=X-NOM:<nominal bitrate>
> b=X-MAX:<maximum bitrate>
> b=X-MIN:<minimum bitrate>

Just curious; what's the motivation for the name change?

> * The number of audio channels should not be specified with an fmtp 
> attribute [...] but as encoding parameter in the rtpmap attribute:
> 
> a=rtpmap:97 VORBIS/44100/2
> 
> If not specified, the number of channels defaults to one (RFC 2327, 
> chapter 6).

Does RTP have a default mapping for >2 channels? If not, does putting it
in the rtpmap mean we can use the mapping in the vorbis spec?

 -r