[Mp4-tech] H.264 prediction methods

[Thammi_Reddy]

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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