For 16×16 MB the number of combination of luma and chroma intra prediction modes is given by the following formula:
Nc x ( 16 x N4 + 4 x N8 + N16 )
where
‘Nc’ is the number of chroma prediction modes (Nc=4)
‘N4‘ is the number of luma prediction modes for 4×4 block (N4=9)
‘N8’ is the number of luma prediction modes for 8×8 block (N8=9), in Main profile 8×8 block is prohibited, therefore N8=0 in Main Profile and N8=9 in High Profile.
‘N16’ – the number of luma prediction modes for 16×16 block (N16=4).
Thus, the total number of combinations per MB to be checked in brute-force way is 4*(16*9 + 4*9 + 4 ) = 736. In Main profile 8×8 intra is disallowed (N8=0) and the number of combination to traverse to find the best is reduced to 592.
So, a fast-decision heuristic rules are necessary to reduce encoding times.
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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