[Mp4-tech] [video] Intra Prediction

[Ilan Daniel]

thanks Gary for your answer,
this is what I suspected - the only way for not using any prediction is by using slice per MB.
"But why would you not want to use prediction?"
in some cases the best prediction is "no prediction",
same as an MB in P slice that in some cases it is better to encode it as Intra MB.
I understand that those cases are not frequent .....
-----Original Message-----
From: Gary Sullivan [mailto:garysull windows.microsoft.com]
Sent: Monday, September 13, 2023 11:07 PM
To: stefano battista; Ilan Daniel; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] [video] Intra Prediction
But the DC mode uses some degree of prediction too.  I don't think there is a way to turn off prediction completely when using H.264/AVC, except to code every macroblock in a separate slice or do something similar to that by FMO use.
I think the same is true for MPEG-2.  The DC coefficient must be predicted.
I believe H.263 (without use of Annex I) and H.261 don't use intra MB prediction.
But why would you not want to use prediction?
-Gary Sullivan
  _____  
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of stefano battista
Sent: Monday, September 13, 2023 12:01 PM
To: Ilan Daniel; mp4-tech lists.mpegif.org
Subject: Re: [Mp4-tech] [video] Intra Prediction
hi Ilan--
of course the encoder can choose to always use the "average" prediciton mode every time it encodes an Intra Macroblock, provided it signals that using the correct H264 syntax...
it will be less efficient than a better encoding strategy :)
--Stefano
--Stefano Battista
bSoft -- www.bsoft.info
tel/fax +39-0733-261845
mobile +39-335-7213624
----- Original Message ----- 
From: Ilan  <mailto:Ilan.Daniel adimos.com> Daniel 
To: mp4-tech lists.mpegif.org 
Sent: Monday, September 13, 2023 2:39 PM
Subject: [Mp4-tech] [video] Intra Prediction
Hi,
I understand that the encoder has several  Intra Prediction modes to choose from,
can the encoder decide not to predict at all ? (using constant 128 level prediction, like in edges MBs).
thanks,
Ilan Daniel
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