RE: [AVT] VC1 payload last call
"Anders Klemets" <Anders.Klemets@microsoft.com> Wed, 21 December 2005 23:10 UTC
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Subject: RE: [AVT] VC1 payload last call
Date: Wed, 21 Dec 2005 15:10:18 -0800
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Thread-Topic: [AVT] VC1 payload last call
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From: Anders Klemets <Anders.Klemets@microsoft.com>
To: Stephan Wenger <stewe@stewe.org>, Colin Perkins <csp@csperkins.org>, avt@ietf.org
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> We need a MIME review, and soon. However, some of our comments pertain to > the MIME subject; therefore, I would suggest not to ask for it right now. It seems that as soon as a WG Last Call starts, Magnus usually sends a message to the ietf-types list to request a review of the Media Type definition. (Apparently this is a new formality that was introduced fairly recently.) But in this case, Magnus must have left for Christmas vacation without sending the request. In his absence, could Colin send this request to the ietf-types list? I understand that Nokia has at least one comment on the Media Type registration section, but I think that does not mean that we must postpone the review on the ietf-types mailing list. > framerate: > The value is an integer greater than zero, specifying the > maximum number of frames per second in the coded bit stream, > > I suggest that the intended use of this parameter should be clarified. We > suppose that the parameter MUST NOT be used for pacing of the rendering > process As currently defined, I think it is impractical for someone to use the "framerate" parameter for pacing, because the definition says it is the _maximum_ frame rate. At any given time, the actual frame rate may be lower than specified, so any attempt to use it for pacing is not likely to work. However, I don't mind adding the clarification that you suggested, if there is some other compelling reason to update the Internet-Draft. > This list lacks BI-picture, specified in SMPTE 421M. Also section 2 > (abbreviations) lacks the BI-picture. Please add. A BI-picture is a just a special kind of B-picture. I don't mention it in version -04, because it adds nothing to the understanding of the RTP payload format. I actually did mention it in earlier versions of the Internet-Draft, but removed it in an effort to focus on the relevant stuff. I can put it back in though, if there is some other reason to revise the Internet-Draft. > In section 6.1 (Media type Registration), width, height, max-width, and > max-height are specified in terms of pixels. However, "pixel" is an > ambiguous term, as the decoder outputs one luma picture and two chroma > pictures, and a luma picture has a different size than the chroma pictures > in terms of pixels. Thus, we would recommend using term "luma sample" > instead of "pixel". I chose the term "pixel" because that is how the decoder initialization parameters HORIZ_SIZE and VERT_SIZE are defined, in Annex J of SMPTE 421M. For the case when the chroma pictures are smaller than the luma picture, I seriously don't think that anyone would get confused and think that "pixels" refers to the size of the chroma pictures. This comment is just nit-picking. But if I need to edit the Internet-Draft I guess I could replace the word "pixel" with "luma sample (pixel in the luma picture)", or something like that. Anders _______________________________________________ Audio/Video Transport Working Group avt@ietf.org https://www1.ietf.org/mailman/listinfo/avt
- [AVT] VC1 payload last call Stephan Wenger
- RE: [AVT] VC1 payload last call Anders Klemets
- Re: [AVT] VC1 payload last call Colin Perkins
- RE: [AVT] VC1 payload last call miska.hannuksela
- RE: [AVT] VC1 payload last call Anders Klemets
- RE: [AVT] VC1 payload last call miska.hannuksela
- Re: [AVT] VC1 payload last call Colin Perkins