[Mp4-tech] H.264 prediction methods

[veni soc-soft.com]

I am just answering to question 3.
Compatiblity is always with respect to decoder and not encoder. Standard
specify the decoder, if u notice.
in nutshell,
given a bitstream with X profile, then a decoder (capable of decoding X
profile) MUST be able to decode that stream.
Hope this helps,
veni
enJOY life
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Thammi_Reddy
Sent: Wednesday, August 25, 2023 12:05 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] H.264 prediction methods
Hi all!,
Please answer the following questions regarding ENCODER, DECODER(H.264)
1. There are NINE 4x4-intra prediction modes and FOUR 16x16-intra
prediction modes available as per the H.264 specs.So, how does the
decoder guy
   know which of these mode is used at the encoder?
2. This is also in the similar lines! There are hundreds of different
algorithms implemented for transformation(like DCT done in Encoder)
    for low-power, high-speed etc etc. So the decoder has to implement
its replica of InverseDCT. How is this done?
3. How the compatibility is achieved when ENCODER and DECODER are
implemented by different companies with their own implementation? 
Thanks.
Thammi Reddy
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