Subject: Re: [payload] WGLC for VP8 (draft-ietf-payload-vp8-11)

From: Ross Finlayson <[email-masked]>
Date: Mon, 27 Oct 2014 23:56:05 -0700

> On Jul 7, 2014, at 10:55 PM, Roni Even <[email-masked]> wrote:
> 
> Hi,
> I reviewed the document and have some comments as individual
[…]
> 6. In section 6.2.2 what is the meaning of max-fr and max-fs if the stream
> is sendonly?

Ditto if a ‘declarative’ SDP description is generated for a stream - e.g., for RTSP?

Section 6.2.1 "Mapping of Media Subtype Parameters to SDP” of the latest VP8 payload format draft ("draft-ietf-payload-vp8-13”) says
	The parameters "max-fs", and "max-fr", MUST be included in the "a=fmtp" line of SDP
I think this is too strong.  IMHO it should be a MUST only if the SDP is used in an ‘offer-answer’ environment, and the stream is not ‘sendonly’ (i.e., the offerer is asking to receive video).

Also, BTW, the same language is in the corresponding section (7.2.1) of the new VP9 RTP payload format draft: "draft-uberti-payload-vp9-00”

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/