[payload] New version of draft-ietf-payload-vp8

[Henrik Lundin <[e-mail]>]

Payload WG:

After the second Last Call, we have done a review of the document against
the comments that were pointed out to us on this document and on previous
versions of the document.

We have made no technical changes to the document, but have added a number
of grammar updates and clarifications. Some of the important clarifications
are as follows:

We have added a number of definitions that were previously only in
referenced documents.

With regard to indexes that start at random numbers and wrap, we’ve
switched to consistently using “wrap”. The text about not starting at zero
is just to say that starting at zero is not required; there is no security
benefit that we know of.

We have removed some material that was repeated from RFC 6386; it was clear
that the explanation copied up was not sufficient for understanding, and we
found it better to refer to the more complete specification in RFC 6386 for
that material.

The definition of the Y-bit and structure of temporal layers has been
strengthened.

SLI and RPSI have been explained with more links back to RFC 4585.

We note that the text about pathological data noted in the sec-dir review
comes from the RTP HOWTO - we have updated the copied text to be consistent
with version -14 of the RTP HOWTO draft.

The Gen-ART review suggested to add a definition of temporal base layer. We
added an informal reference to an article on scalable video coding, and
think that the general definitions of scalability found therein apply to
this draft too.

The Gen-ART review also suggested that the VER field in the VP8 Payload
Header should be validated by the depacketizer. We disagree with this, and
argue that the VER field should be verified by the VP8 decoder.

For minor updates, please refer to the diff at
https://www.ietf.org/rfcdiff?url2=draft-ietf-payload-vp8-17.

With this update, we believe the document is ready for publication.

Sincerely,
/Henrik

-- 
Henrik Lundin | WebRTC Software Eng | [e-mail] | [phone]