[Mp4-tech] Please Help !!

[swapnil shingvi]

Hello All,
I am working on a research project which is related to H.264 coder/decoder downloaded from
http://iphome.hhi.de/suehring/tml/download/.  I am trying to change the encoder QP based on the varying network conditions
I performed the following
1. Using a video file (.yuv) I observed the bitrate of the codec in the output after encoding (a particular number of frames) for various values of QP (0,10,20,30,40,50)
2. I created a table of these values and further calculated the bits per pixel value for each of the bitrates in 1 above.
3. Now I relate the bitrate value of the table to the bandwidth available in the network in a C program and when the banddwidth = (one of the bitrate values in 1 or some range in 1) then I set the QP as per the table.
4. My basic goal is the see the performance improvement (PSNR) when the values are used from the table for bandwitdth available (which I compare to the bitrate in table) to determine the QP value in one situation and when I use a lower QP value from the table than which corresponds to a this bandwidth (bitrate in table )requirement.
5. To achive this I want to change the bitrate value of the encoder for a known deliberately chosen lower QP than the one which corresponds to it in the table and see if this reduces the PSNR and then tell the program to use the QP in table to improve performance.
I hope my question is clear
Please advice,
All help will be appreciated.
Thanks
Swapnil
        Swapnil Vijay Shingvi 
 Masters In Computer Engineering 
  Graduate Research Assistant
  (  Cisco TAC Team  )
     Wichita State University,
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