[Mp4-tech] Question About H.264/AVC ---- POC

[Ming Yang]

Dear all:
I have some questions about H.264/AVC JM10.1:
(1) What does POC mean in the decoder output?
(2) What does POC Gap mean?
(3) What does IPP /IbP/IpP mean?
(4) Howcome the output frame #s are always:
      0000
      0002
      0004
      0006
      .........
they are not consecutive numbers no matter how I set IntraPeriod, FrameSkip, and NumberBFrames. Even if the original video sequence is encoded as all I-frames, the output is still like this. 
Can anybody explain this to me? Thank you very much.
Ming
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