[Mp4-tech] [H.264] Deblocking across Slices/SliceGroups

[Mohit Garg]

Hello All,
I have some confusion regarding the Deblocking specifications. The
specifications [Ref: ITU-T Rec. H.264 (03/2005) - Prepublished version]
in Section 8.7, say that when  "disable_deblocking_filter_idc is equal
to 2, macroblocks in different slices are considered not available
during specified steps of the operation of the deblocking filter
process." It also mentions that
filterLeftEdgeMBFlag/filterTopEdgeMBFlag=0 when
disable_deblocking_filter_idc =2 and mbAddrA/mbAddrB is not available.
Since 'availability' (Section 6.4.5) is defined to treat macroblocks in
different slices as not available, this means that when
disable_deblocking_filter_idc =2 we do not have to apply the filter
across slice edges. Some questions:
~ What about the case when disable_deblocking_filter_idc =0? Do we have
to filter across slices in this case? Doesn't this conflict with the
fundamental idea behind slices (error resilience)?
~ What about sliceGroups? Since every sliceGroup edge will necessarily
be a slice edge, does the above apply to sliceGroup edges too? 
Thanks and regards,
Mohit Garg
Nvidia Graphics Pvt. Ltd.
"We may say that we KNOW, but by our actions it is KNOWN" -- Anon
Personal Homepage: http://mohitgarg.vectorstar.net
Social Work: http://www.noragging.com
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