Near video on demand

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  • pisagor1
    Junior Member
    Junior Member
    • Dec 2002
    • 7
    #1

    Near video on demand

    Hi all.
    what do you think about the below problem?

    A near video on demand scheme works best when each frame set is the same size. Suppose that a movie is being shown in 24 simultaneous streams and that one frame in 10 is an I-frame. Also assume that I-frames are 10 times larger than P-Frames. B-frames are the same size as the P-frames. What is the probability that a buffer equal to 4 I-frames and 20 P-frames will not be big enough? Assume that frame types are randomly and independently distributed over the streams.
    Tags: None
    • khp
      The Other
      • Nov 2001
      • 2161
      #2
      What is the average key frame interval ?
      Last edited by khp; 12 Dec 2002, 08:09 PM.
      Donate your idle CPU time for something usefull.
      http://folding.stanford.edu/

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        • Enchanter
          Old member
          • Feb 2002
          • 5417
          #3
          Sounds like a challenging problem...

          One question though. According to the statement "A near video on demand scheme works best when each frame set is the same size", that implies that we want all frames in a given stream to be of the same size. Knowing that B-frames and P-frames (let's associate them with the term BP) are of the same size, but not I-frames, that means that it is not desirable to have BP AND I-frames together under one stream.

          Hence this would make the question "What is the probability that a buffer equal to 4 I-frames and 20 P-frames will not be big enough?" hard to answer. That is unless I'm misinterpreting the question and the minimum desired size (what is it anyway?).
          Last edited by Enchanter; 12 Dec 2002, 07:50 PM.

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            • pisagor1
              Junior Member
              Junior Member
              • Dec 2002
              • 7
              #4
              Re: Near video on demand

              we may think it as 24 different streams ie 24 different videos so they are considered simultaneously occupying the bandwidth.
              So what can the solution be now?


              Originally posted by pisagor1
              Hi all.
              what do you think about the below problem?

              A near video on demand scheme works best when each frame set is the same size. Suppose that a movie is being shown in 24 simultaneous streams and that one frame in 10 is an I-frame. Also assume that I-frames are 10 times larger than P-Frames. B-frames are the same size as the P-frames. What is the probability that a buffer equal to 4 I-frames and 20 P-frames will not be big enough? Assume that frame types are randomly and independently distributed over the streams.

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