[Mp4-tech] Why MB-skip is not allowed in H.264 for I picture

[Shevach Riabtsev]

Dear experts 
Unlike other standards (H.261, Mpeg2 and Mpeg4), spatial redundancy in
H.264 is much more exploited. Indeed, there are 9 intra prediction modes
for INTRA4x4, 4 modes for 16x16 versus DC/AC prediction of Mpeg4 or DC
only prediction in Mpeg2. Consequently for smooth I-pictures zero
coded_block_pattern is frequently observed.  
I wonder why mb-skip is forbidden in AVC for I-pictures. Is there any
reason? 
Regards, Shevach
Broadcom
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