[Mp4-tech] Why spatial prediction in AVC performed in pixel domain?

[Shevach Riabtsev]

Dear experts
The spatial prediction in AVC is executed in pixel (sample) domain,
while in MPEG2 and MPEG4 the spatial prediction (actually partial
prediction) is performed in frequency domain. 
I think that on noisy material it is beneficial to perform the spatial
prediction in frequency domain in the same manner as pixel-domain
prediction. 
Say, for each 4x4 block, DCT and quantization is performed, then the
prediction direction and the residual between quantization coefficients
of the current 4x4 block and the neighboring (left and/or top) is
calculated. 
What was a reason to prefer the sample domain for the spatial prediction
instead of frequency one. 
 Regards,  Shevach
Broadcom
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