[Mp4-tech] mbaff

[Gary Sullivan]

Yes, but MbaffFrameFlag (a flag derived from the field_pic_flag in the
slice header) is either 0 or 1 for the entire picture.  So it is true
that "MBAFF is either active or inactive for the entire picture".
Like I said, the adaptivity is at the macroblock-pair level.  That is
where mb_field_decoding_flag resides.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mark_wezelenburg zonnet.nl [mailto:mark_wezelenburg zonnet.nl] 
+> Sent: Wednesday, April 20, 2024 12:17 AM
+> To: Gary Sullivan
+> Cc: mp4-tech lists.mpegif.org
+> Subject: RE: [Mp4-tech] mbaff
+> 
+> Hi,
+> 
+> Check, It's the "mb_field_decoding_flag" that I missed (slice data)
+> 
+> Mark
+> 
+> 
+> 
+> Citeren Gary Sullivan <garysull windows.microsoft.com>:
+> 
+> >  
+> > Re: "it appears that mbaff is either active or inactive 
+> for an entire
+> > picture"
+> > 
+> > That statement is true.
+> > 
+> > There is nothing wrong with the statement in subclause 7.4.3.  The
+> > adaptivity of MBAFF is at the macroblock-pair level, not the slice
+> > level.
+> > 
+> > Best Regards,
+> > 
+> > Gary Sullivan
+> > 
+> > 
+> > +> -----Original Message-----
+> > +> From: mp4-tech-bounces lists.mpegif.org 
+> > +> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of 
+> > +> mark_wezelenburg zonnet.nl
+> > +> Sent: Tuesday, April 19, 2024 10:20 AM
+> > +> To: mp4-tech lists.mpegif.org
+> > +> Subject: [Mp4-tech] mbaff
+> > +> 
+> > +> Hi,
+> > +> 
+> > +> With reference to ITU H.264 05/2003
+> > +> 
+> > +> Section 6.2 claims the purpose of mbaff for local 
+> > +> frame/field encoding,
+> > +> however 7.4.3 states that the "field_pic_flag" must be the 
+> > +> same for all
+> > +> slice headers in a coded picture. since mbaff depends on 
+> > +> this parameter,
+> > +> it appears that mbaff is either active or inactive for an 
+> > +> entire picture.
+> > +> 
+> > +> I assume the text in 7.4.3 is wrong, is that so ? Or is 
+> > +> there another mechanism
+> > +> that I overlooked
+> > +> 
+> > +> Thanks,
+> > +> 
+> > +> Mark
+> > +> 
+> > +> 
+> > +> 
+> > +> 
+> > +> -- 
+> > +> 
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