[M4IF Technotes] mpeg4-video : MB-Quant vs 4MV

[Ramkishor Korada]

Hi,
 This is done to save the bits in sending the dquant info when 4 MV is used
as more bits are required to code motion vectors in this case.
regards,
ramkishor
Architect - Video
Multimedia Technologies Division
Emuzed India
Bangalore
www.emuzed.com
----- Original Message -----
From: "Chandra Sekhar Reddy G" <gchandra   tataelxsi.co.in>
To: "M4IF TechNotes" <technotes   lists.m4if.org>
Sent: Wednesday, January 30, 2024 10:25 AM
Subject: [M4IF Technotes] mpeg4-video : MB-Quant vs 4MV
> Hi All,
>
> The Mpeg4-Video-Standard prohibits Quant and 4MV to be present in the same
> Macroblock.
> There may be some cases, where this will be useful.
>
> e.g.., in the encoder,
> 1. when we do MB-level bit-rate-control, we may need to send Quant, if we
do
> that, we can not go for 4MV.
> 2. we may have decided to go for 4MV for that macroblock, if we do that,
we
> can not do MB-level bit-rate/quality control (by changing Quant).
> that means, you have to only one tool, either "MB-level bit-rate/quality
> control" or "4MV ".
>
> Why such restriction in the standard?
> I think, that choice should have been left for the intelligence of the
> Encoder.
>
> Regards,
> Chandra
>
>
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