H.323 Annex I
adamli at icsl.ucla.edu
Tue Feb 13 01:40:10 EST 2001
Dear Mr. Baese, experts,
> concerning your document APC 2018 "Protection Procedure":
> c) If the protection is actually done with level p-1 why do one has
> to keep level p somehow ? In opposition to the written text is
> packet #3 in your figure.
> d) Can you please explain the meaning of "packet" in
> every case it is mentioned within this paragraph ?
The grouping rule in the protection procedure is now reworded. It now reads:
a. A media packet can only be protected at each protection level once.
b. For a media packet to be protected at level p, it must also be
protect at level p-1.
c. If an FEC packet contains protection at level p, it must also
contain protection at level p-1.
I hope it is clearer now. Let me know if there is any further questions.
> We are supposed to perform the test reproducible for everybody else
> within the standardization community. Which public available software
> for H.263 we are going to use ?
This question may be better answered by Q.6/16 (Video Coding Experts Group),
who works on standardizing the H.263 video codec. All the algorithms for
H.263 are detailed in the H.263 and TMN documents in Q.6. As far as I know,
UBC (University of British Columbia) has a (semi-official) sample software
implementation of the codec.
Hope it helps.
Adam H. Li
Image Communication Lab (310) 825-5178 (Lab)
University of California, Los Angeles (310) 825-7928 (Fax)
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