[Mp4-tech] (no subject)

[Lefan Zhong]

Hi fellows,
If a P-frame start with 1 not-coded macroblock,  then a stuffing
macroblock and then a not-coded macroblock, then a INTRA-Q macroblock,
my question is that INTRA-Q is the 1st coded macroblock in VOP or the
2nd coded macroblock in the VOP?
The 1st or 2nd may affect the Qp uses for INTR_VLC_DC_THR switch, which
simple profile should always supported.
>From the document 14496-2(2001), I haven't found any sentence claim that
stuffing macroblock should be counted as NOT-Coded. So restrictly follow
the spec, the stuffing macroblock is 1st coded,  the INTRA-Q should be
the 2nd coded macroblock. 
Reference decoders definitely take the INTRA-Q macroblock as the 1st
coded macroblock in the VOP.
Maybe we need an amendment for the Spec 14496-2.
Lefan 
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