Dear Mr. Li, experts,
of course finding the best technical solutions that works is our joint goal and we completely agree we are working for the ITU for technical not political reasons.
it is quite discouraging that our questions remaining unanswered and the positive signs we were sending are ignored still.
I believe that we are here in ITU to discuss technical issues and to design the best technical solutions that works, not politics.
On the one hand we can read your avowal to a technical discussion on the other hand our technical questions are remaining unanswered still. (first sent on 13.12.2000 and 14.12.2000 and repeated several times since that time).
Here are several of the questions again:
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 ?
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 meeting deadline is approaching. Any further delay leads to less meaningful results.
Best Wishes Gero Baese
----------------------------------------------------------- Gero Bäse Siemens AG Tel.: +49 89 636 53193 Corporate Technology Fax: +49 89 636 52393 Networks and Multimediacommunication CT IC 2 -----------------------------------------------------------
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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 Li
---------- Adam H. Li Image Communication Lab (310) 825-5178 (Lab) University of California, Los Angeles (310) 825-7928 (Fax)
Hi Adam, Group,
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.
This codec is no more available, neither in the form of the public domain code, nor as the semi-official so called "ITU codec" which was sold by UBC for $1000 to interested parties. UBC became aware that both codecs were used as the start point for commercial implementations -- something that was strictly prohibited by the license contract. In order to avoid possible legal problems UBC decided not to continue the project in the current form.
In other words: there is NO public available software for H.263 at the moment. Only a few old versions (including buggy implementations of the low complexity modes of the TMN for the error prone cases) may still be found on the Internet. Certainly, there is no code out there which supports version 3 features such as Annex V (data partitioned slice mode) or even full Annex K slices, and at least the latter is essential for the use over error prone links.
Stephan
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participants (3)
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Adam Li -
Baese Gero -
Stephan Wenger