Are there any use-cases besides web streaming and communication that is being considered for this effort? If people are thinking of using a new codec for something like digital cinema then an all intra case makes sense.
Mohammed On Sun, Mar 15, 2015 at 11:06 PM, Harald Alvestrand <[email protected]> wrote: > (side note: I *hate* the current setting of Thunderbird where it doesn't > wrap lines before replying - it interferes destructively with Mo's > Outlook settings that send plain text with extremely long lines... > apologies for the broken result.) > > > Den 15. mars 2015 17:54, skrev Mo Zanaty (mzanaty): > > I don't have good stats, but I'm sure it's much longer than all current > test sequences, which tend to be only a few seconds due to uncompressed > video size constraints. > > > > It is important to understand intra efficiency during a stream switch, > recovery, join, random access, etc. Perhaps we can just test All-Intra > configs as a separate data point for this rather than mixing periodic intra. > > > > By "All-Intra", do you mean streams with only I-frames? I think they are > probably too unrealistic to tell us much except the still image > performance. Even adding 3 p-frames after the i-frame will > *significantly* increase compression of the video stream. > > But it would indeed be nice to have specific data on how the encoding > efficiency varies with recovery point interval. There should be some > point where the average efficiency is not significantly affected by > regular I-frames, because the I-frame size is small compared to the > accumulated p-frames (but the bumpy bitrate caused by large I-frames > could still cause interesting effects in bandwidth-constrained situations.) > > > Mo > > > > > > > > On Mar 15, 2015, at 10:07 AM, Timothy B. Terriberry <[email protected]> > wrote: > > > > Mo Zanaty (mzanaty) wrote: > >> Another reason for testing with periodic intra is the recent rise in > RTP mixers which switch rather than transcode media. Setting the intra > interval to the average active speaker switching time gives a good estimate > of real-world codec efficiency in these topologies. > > > > Do either you or Harald have some statistics with which to estimate that > time? > > > > _______________________________________________ > > video-codec mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/video-codec > > > > _______________________________________________ > > video-codec mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/video-codec > > > > _______________________________________________ > video-codec mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/video-codec > -- Mohammed Raad, PhD. Partner RAADTECH CONSULTING P.O. Box 113 Warrawong NSW 2502 Australia Phone: +61 414451478 Email: [email protected]
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