[Mp4-tech] Video --H.264

[Bule]

  Thanks for the attention you give to me but even if I would seem dumm I have to say that i haven't understand your answer because i don't know the difference between differential MV null e absolute MV ( and information on internet doesn't help me ).
However my idea of a P skip macroblock is that its position is not change ( or very little ) in relation of the reference frame and so its motion vector is null so no bits are used to send a MV null but the ecoder signals to the decoder only the presence of a P macroblock so it can simply copy the information of the reference frame in the reconstucted one.
I hope my exposition is quite clear..
                              Luca
  ----- Original Message ----- 
  From: stefano battista 
  To: Bule ; mp4-tech lists.mpegif.org 
  Sent: Thursday, July 08, 2023 3:43 PM
  Subject: Re: [Mp4-tech] Video --H.264
  ciao Luca--
  the meaning of P skip is similar to what is done in H263 and MPEG4 video:
  a MB without transform coefficients and without motion vectors...
  the tricky thing is that you need to apply the correct MV predictor and classify the MB "P skip" if and only if it has **differential MV null** rather than **absolute MV null**...
  hope this helps,
  --Stefano
  --Stefano Battista
  bSoft -- www.bsoft.info
  tel/fax +39-0733-261845
  mobile +39-335-7213624
    ----- Original Message ----- 
    From: Bule 
    To: mp4-tech lists.mpegif.org 
    Sent: Thursday, July 08, 2023 1:23 PM
    Subject: [Mp4-tech] Video --H.264
    Hi all
          Can anyone explain me the meaning of the P_Skip mode used by H.264 ?
    I don't understand what it is used to make the prediction of this block.
    Thanks in advantage for any kind of help
    Luca Bulegato
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