[M4IF Technotes] MPEG-4 4MV/interlaced question

[Prabhudev Hosur]

Larry,
4MV is “not” prohibited for VOL with interlaced =1
-Prabhu
-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of Larry Pearlstein
Sent: Wednesday, October 17, 2023 2:15 PM
To: 'M4IF TechNotes'
Subject: [M4IF Technotes] MPEG-4 4MV/interlaced question
Dear M4IF participants,
In the MPEG-4 spec, it says:
"The sample interpolation in case of non-integer motion vectors is performed
for 16x16 or 8x8 frame blocks in case
of progressive and for 16x8 field blocks in case of interlaced macroblocks."
But the syntax doesn't seem to preclude 4MV when doing interlaced VOLs.
Presumably the syntax supports 4MV in interlaced if field_prediction = 0.
Is 4MV prohibited for VOLs where interlaced = 1?
Thank you for your help.
                                Best wishes,
                                Larry
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