Re: [AVT] I-D ACTION:draft-ietf-avt-uncomp-video-00.txt

[Chuck Harrison <cfharr@erols.com>]

Hi, all,

Internet-Drafts@ietf.org wrote:
> 
>         Title           : RTP Payload Format for Uncompressed Video
>         Author(s)       : L. Gharai, C. Perkins
>         Filename        : draft-ietf-avt-uncomp-video-00.txt
>         Pages           : 11
>         Date            : 2002-10-18

This looks to be a nice clean payload. Time to gum it up with
some bells & whistles! ;-)

There is considerable interest in video standards operating at
12 bits per primary RGB, and some post-production operations use
a fourth "A" of "alpha" channel for keying or compositing.

SMPTE has trial-published a standard 372M for carrying this type
of information at the HDTV 1920x1080 resolution on dual 1.5Gb/s
data channels:
http://www.smpte.org/smpte_store/standards/pdf/s372m.pdf

This RTP payload should make provision for the signal formats
defined in 372M, although a more natural packing based on
8-bit rather than 10-bit words should be considered. Although
372M defines only 1920x1080 formats, similar codings should
be supported at lower and higher resolutions.

When high-resolution motion picture files are exchanged in
professional environments, the "DPX" Digital Picture Exchange
file format SMPTE 268M is commonly used. This is a simple
packed format that provides very wide flexibility in bit
depth and resolution. It would be interesting to mimic this
format in a "streaming" mode under RTP, and this payload
may meet that need with little modification. This is worth 
investigating.

Cheers,
  Chuck Harrison
  Far Field Associates, LLC
  +1 360 863 8340 (voice)  PDT = GMT-0700
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