[Mp4-tech] [video]AVC field selection

[Andrew Palfreyman (cisco)]

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