[Mp4-tech] h.264 direct_8x8_inference_flag

[Alexis Michael Tourapis]

This flag impacts the derivation of the motion vectors of the collocated
partitions. Enabling it would result in motion vectors being computed at the
8x8 block level instead of 4x4. To make it clearer see figure:
x o | o x
o o | o o
- - - - -
o o | o o
x o | o x
In this motion vectors for blocks in the collocated marked as "o" will take
the motion vector of block "x" and use that instead.
And yes it does affect spatial direct since spatial direct tests a
"stationarity" condition of the collocated to derive motion vectors.
Best regards
Alexis
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of nitthilankj
Sent: Monday, February 21, 2024 1:00 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] h.264 direct_8x8_inference_flag
What is its significance..Does this affect direct spatial mv derivation?
k.j.nitthilan
d&d engg.
tata elxsi
bangalore.
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