[Mp4-tech] difference between picture order count related variables

[Shinjith Unithrattil]

  sir,
      I am working on h.264 decoder. I couldnt find out the actual difference between the following:
FrameNum and PicNum
prevFrameNumOffset,FrameNumOffset and absFrameNum
picOrderCntCycleCnt, frameNumInPicOrderCntCycle and expectedDeltaPerPicOrderCntCycle
expectedPicOrderCnt and Top/BottomFieldOrderCnt
PicOrderCntMsb and PicOrderCntLsb
Can you kindly make it clear to me
thank you
regards,
shinjith
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