Hi One more comment on frame rates in the draft, I would like to see frame rates that are not fixed (or perhaps not specified at all). With H.264, for example, the frame rate / pts / dts / duration left up to the container format. Taking a quick look at the draft it seems like variable frame rates are not addressed but if they will be then disregard this note.
James On Fri, Jan 15, 2016 at 7:13 AM, Krupiczka, Andrew < [email protected]> wrote: > > > Good morning, > > > > Yes, concurring with Greg to include support for fractional frame rates. > > As for ESPN our current default frame-rate is 59.94fps and also using > 29.97fps for the OTT. > > Kind regards, > > > > Andrew Krupiczka > > > > *From:* video-codec [mailto:[email protected]] *On Behalf Of > *Coppa, > Greg > *Sent:* Friday, January 15, 2016 9:46 AM > *To:* Minhua Zhou; Adam Roach; [email protected] > > *Subject:* Re: [video-codec] Call for review comments: > draft-ietf-netvc-requirements > > > > Dear All - > > > > A comment regarding frame rate - I note that all frame rates in this > document are integer. I suggest that fractional frame rates be added > particularly the more popular ones. > > > > CBS is a provider of many hours of content to the syndication market > (OTT/VOD, US and International) I note that we are often required > (contractually) to deliver this content in its native frame rate. The > native frame rate of most of this content (e.g Star Trek, Frasier, etc.) is > 23.976 fps. > > > > greg > > > ------------------------------ > > *From:* video-codec [[email protected]] on behalf of Minhua > Zhou [[email protected]] > *Sent:* Thursday, January 14, 2016 6:03 PM > *To:* Adam Roach; [email protected] > *Subject:* Re: [video-codec] Call for review comments: > draft-ietf-netvc-requirements > > Dear all, > > > > I have few quick comments > > > > 1) Table 6. > > It seems that the parameters there only constrain the maximum pixel rate, > which is not sufficient for containing decoder implementation cost. We need > to have additional parameters to restrict decoder on/off chip memory > footprint and entropy decoding throughput. At least the following > parameters are missing: > > · Maximum horizontal picture size => impacts line buffer size > > · Memory size for buffering bitstream and decoded reference > pictures => impacts off-chip memory size > > · Maximum bit-rate and minimum compression ratio => impacts > entropy decoding throughput requirement for real-time decoding > > > > 2) Section 3.1 > > if YUV 4:4:4 is a basic requirement, there should be no problem for a same > codec to support RGB 4:4:4 color sample format. Therefore, YUV/RGB 4:4:4 > should be put in a same place (either in section 3.1 or in 3.2) > > > > 3) HDR (high dynamic range) should belong to section 3.1. > > > > 4) WCG (Wide Color Gamut) support is missing, e.g. color space > BT.2020, DCI-P3, BT.709 and OETF (ST.2084, HLG, BT.1886) > > > > 5) Section 4.1 > > since H.265 is taken as reference codec for compression efficiency > comparison, why not taking JCTVC approach to do subjective quality > evaluation, i.e. using 4 fixed QPs (could be sequence dependent to match > the target bit-rates) and computing BD-rate difference at the end? > > > > Regards, > > > > Minhua > > > > > > -----Original Message----- > From: video-codec [mailto:[email protected] > <[email protected]>] On Behalf Of Adam Roach > Sent: Thursday, January 14, 2016 1:56 PM > To: [email protected] > Subject: [video-codec] Call for review comments: > draft-ietf-netvc-requirements > > > > NETVCers: > > > > In Yokohama, we adopted draft-ietf-netvc-requirements as a working group > item. The current document has taken into account most of the comments from > that meeting. > > > > Please take a few moments to read over the current document, looking in > particular for requirements that you think may be missing: > > https://tools.ietf.org/html/draft-ietf-netvc-requirements-00 > > > > Thanks! > > > > /a > > > > _______________________________________________ > > video-codec mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/video-codec > > _______________________________________________ > video-codec mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/video-codec > >
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