[Mp4-tech] [h264] quantization scaling lists

[h M]

Hi all,
With High profiles, the encoder can update the quantization scaling lists
either in the Sequencce Parameter Set or in the Picture Parameter Set.
Does it mean that the same lists are applied for all macroblocks in a same
picture ???!!!
What is the benefit then ?
I mean with progressive image transmission, the main focus is to extract
regions of interest in a picture, and to improve their quality by scaling !
Thank you in advance.
Hichem
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