Note: This ballot was opened for revision 05 and is now closed.

(Ben Campbell) Yes

Thanks for this, it is well written and easy to read. (It easily hides all the gnashing-of-teeth that went into it.)  I've got just a couple of minor comments:

-- section 3: "the video scan pattern for video codecs is Y’CbCr 4:2:0."

At the risk of stepping way outside my expertise, I've generally heard that referred to as a (sub)sampling ratio.  Is this talking about something different?

-- 6.2, "max-mbps,..."

Odd vertical spacing.

Alissa Cooper Yes

(Spencer Dawkins) Yes

Thank you for producing this document. I'm only mildly familiar with this level of detail, and the document was clear, with pointers when I needed them. I'm honored to ballot Yes.

I did have one question. In this text:

   Implementations MAY send and act upon "User data registered by Rec.
   ITU-T T.35" and "User data unregistered" messages.  Even if they do
   not act on them, implementations MUST be prepared to receive such
   messages without any ill effects.

Is that a usual thing to say? Perhaps it is, but I thought that might be understood.

(Terry Manderson) Yes

(Jari Arkko) No Objection

(Alia Atlas) No Objection

Deborah Brungard No Objection

(Benoît Claise) No Objection

(Brian Haberman) No Objection

(Joel Jaeggli) No Objection

Barry Leiba No Objection

I do wonder that the Abstract and Introduction are both short, and, yet, give such different descriptions of the document as to make it look like two different documents.  Given how short they are, perhaps it really is best to make them the same, no?

Abstract:
   This specification provides the requirements and considerations for
   WebRTC applications to send and receive video across a network.  It
   specifies the video processing that is required, as well as video
   codecs and their parameters.

Introduction:
   This
   specification defines how the video is used and discusses special
   considerations for processing the video.  It also covers the video-
   related algorithms WebRTC devices need to support.

(Kathleen Moriarty) No Objection

Alvaro Retana No Objection

(Martin Stiemerling) No Objection