[Mp4-tech] [video]AVC field selection

[Gary Sullivan]

When the current macroblock is coded in field mode, each reference field is considered a different "reference picture" in that sense.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org 
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of 
+> Andrew Palfreyman (cisco)
+> Sent: Wednesday, June 20, 2023 8:46 PM
+> To: dthoang yahoo.com; mp4-tech lists.mpegif.org
+> Subject: Re: [Mp4-tech] [video]AVC field selection
+> 
+> The problem I have with that approach is that in 7.4.5.1 it states
+> "When only one reference picture is used for inter 
+> prediction, the values of 
+> ref_idx_l0[mbPartIdx] shall be inferred to be equal to 0".
+> So even though the ref. pic has two field parities, these cannot be 
+> differentiated via a zero value of ref_idx.
+> 
+> Best,
+> Andrew
+> 
+> ----- Original Message ----- 
+> From: "Dzung Hoang" <dthoang yahoo.com>
+> To: "'Andrew Palfreyman (cisco)'" <anpalfre cisco.com>; 
+> <mp4-tech lists.mpegif.org>
+> Sent: Wednesday, June 20, 2023 8:08 PM
+> Subject: RE: [Mp4-tech] [video]AVC field selection
+> 
+> 
+> > Try LSB of ref_idx XOR with current field parity.
+> >
+> > Regards,
+> > - Dzung Hoang
+> >
+> > -----Original Message-----
+> > From: mp4-tech-bounces lists.mpegif.org
+> > [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of 
+> Andrew Palfreyman
+> > (cisco)
+> > Sent: Wednesday, June 20, 2023 12:04 PM
+> > To: mp4-tech lists.mpegif.org
+> > Subject: [Mp4-tech] [video]AVC field selection
+> >
+> > For AVC, I am trying to identify (with little success so 
+> far) the semantic
+> > equivalent of what in MPEG2 was called 
+> motion_vector_field_select. How is
+> > this accomplished in AVC?
+> >
+> > Best,
+> > Andrew
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