Re: [payload] WGLC for draft-ietf-payload-rtp-ancillary-08

[John Fletcher <[e-mail]>]

Apologies for slightly late comments but ...

In section 2.1, definition of "C" bit, HD signals are mentioned but not UHD.  I think the definition really depends on whether the SDI interface uses separate data channels for luma and color-diff, so perhaps the specification could be re-worded along those lines.  At the very least, say "HD and UHD signals".

Specifications about RTP timestamp clock rate appear in section 3.1 as part of the media format parameters but I think these should be in section 2 as part of the timestamp definition.  Section 3.1 should just say that the Rate parameter is required.

Section 1, Introduction, uses normative word "should" in "It should be noted that".  I suggest changing to "Note that".

In section 3.1, the normative word "may" is used in "implementers may care" and "may not care".  It's not appropriate to give implementers permission or to forbid them from caring.  I suggest changing to "might".

In section 3.1, "those that must interoperate with", I suggest deleting "must".

In section 4, "the ancillary data stream may potentially contain", suggest changing to "might" to indicate possibility rather than permission.

In section 4.1, the normative word "may" is used in "implementers may wish to".  It's not appropriate to give implementers permission to wish.  I suggest deleting "to wish".

In section 5, again we have "may with", I think meant to be "may wish".  I suggest changing to "might wish" in this case.  Other uses of "may" in this section seem fine but should be capitalised.

In section 7, "It may still be a good idea", suggest changing "may" to "might".

In section 7, "receivers should take care to", I suggest deleting "take care to".

Some uses of "required" in the memo are not specifying normative requirements, suggest re-wording or changing to "needed".

Several occurrences of "may", "must", "should", "required" and "optional" are not capitalised.

Regards,
John

________________________________
From: payload [[e-mail]] on behalf of Ali C. Begen [[e-mail]]
Sent: 04 April 2017 15:49
To: [e-mail]
Subject: [payload] WGLC for draft-ietf-payload-rtp-ancillary-08

WG,

We will run another WGLC on this draft as there have been some significant changes since we ran the WGLC earlier.

Please have a look at the draft (at least to the diff) and send your comments to the list by April 19th.

https://datatracker.ietf.org/doc/html/draft-ietf-payload-rtp-ancillary-08

Thanks.
-acbegen (co-chair)



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