RE: [AVT] RFC 3984 offer/answer Question

Yuval,

> m=video 49170 RTP/AVP 98

> a=rtpmap:97 H264/90000

> a=fmtp:97 profile-level-id=42A00A; packetization-mode=0;

You just have a problem with the payload type 98

> m=video 49170 RTP/AVP 98

> a=rtpmap:98 H264/90000

> a=fmtp:98 profile-level-id=42A00A; packetization-mode=0;

> -----Original Message-----

> From: Yuval Nissan [mailto:Yuval.Nissan at audiocodes.com]

> Sent: Wednesday, August 15, 2007 9:19 AM

> To: Randell Jesup; ctrobianni at ecotronics.com

> Cc: Even, Roni; avt at ietf.org

> Subject: RE: [AVT] RFC 3984 offer/answer Question

> I now understand that the following scenario is legal:

> Offerer support up to level 3.

> Offerer -> Answerer SDP message:

> m=video 49170 RTP/AVP 98

> a=rtpmap:98 H264/90000

> a=fmtp:98 profile-level-id=42A01E; packetization-mode=0;

> Answerer support level 1 only.

> Answerer -> Offerer SDP message:

> m=video 49170 RTP/AVP 98

> a=rtpmap:97 H264/90000

> a=fmtp:97 profile-level-id=42A00A; packetization-mode=0;

> The offerer understands that the session should be in level 1.

> Thanks for your feedback,

> Yuval

> -----Original Message-----

> From: Randell Jesup [mailto:rjesup at wgate.com]

> Sent: Tuesday, August 14, 2007 19:25

> To: ctrobianni at ecotronics.com

> Cc: Yuval Nissan; roni.even at polycom.co.il; avt at ietf.org

> Subject: Re: [AVT] RFC 3984 offer/answer Question

> "Cesar Trobianni" <ctrobianni at ecotronics.com> writes:

> >>The level is the highest level supported so level 3 means that you

> also

> >>support level 1. This is specified in RFC 3984.

> >>

> >>B can offer level 3.

> >

> >But still a separate profile-level-id ftmp line per level should be

> >acceptable (as worst-case scenario), right?

> You can only have one fmtp line per payload value.

> You can define multiple payloads with different fmtp's for a media

> stream,

> however. Responses (payloads and their fmtp's) are matched up against

> the

> offer using a combination of profile-level-id, packetization-mode, and

> (if

> used) the sprop interleave (if I remember correctly - that last one only

> applies to packetization-mode 2).

> Assuming anyone implements all of that totally correctly... :-/

> --

> Randell Jesup, Worldgate (developers of the Ojo videophone), ex-Amiga OS

> team

> rjesup at wgate.com

> "The fetters imposed on liberty at home have ever been forged out of the

> weapons

> provided for defence against real, pretended, or imaginary dangers from

> abroad."

> - James Madison, 4th US president (1751-1836)

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