Re: [AVT] supporting variable picture sizes in draft-ietf-avt-rtp-h264-10.txt

[Dave Lindbergh <lindbergh at 92f1.com>]

Displays are outside the scope of H.264 - the standard covers only 
bitstream syntax and decoding.

So displays are free to show the decoded video any way they prefer - they 
can scale to the largest size, display in actual format, drop frames, 
whatever...

(A H.264 conformant decoder does not have to have a display at all.  Things 
like MCUs or recorders usually don't.)

--Dave


At 10:41 AM 7/22/2004, REHA CIVANLAR wrote:

> We noticed that in Section 1.2 of draft-ietf-avt-rtp-h264-10.txt seems to 
> imply that more than one picture size
> can be supported in the same video bitstream by toggling between two or 
> more parameter sets.
>
> The question is how is the decoder supposed to display video containing 
> varying picture sizes (e.g., does it interpolate
> all the pictures to do largest size?) Is this specified in any part of the 
> standard?
>
>
>
> ------------------------------------------------------
> Prof. M. Reha Civanlar, Ph.D.
> Computer Engineering Department
> Koç University
> Istanbul, TURKEY
> +90 212 338 1719
> rcivanlar at ku.edu.tr
>
>
> _______________________________________________
> Audio/Video Transport Working Group
> avt at ietf.org
> https://www1.ietf.org/mailman/listinfo/avt

----------
Dave Lindbergh
Polycom, Inc.
100 Minuteman Road
Andover MA 01810  USA
Voice: +1 978 292 5366
Email: lindbergh at 92F1.com
H.320, H.323 video by arrangement

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