[M4IF Technotes] Re: Need Advice on Motion Estimation for MPEG-4 encoder ... pls advise....

[Mithun N]

Hi Mr clover
Sorry for the delay in reply.
the encoder need not calculate any motion vectors
for the chroma blocks...
the answer i gave was with respect to the decoder.
the encoder will just perform motion vector
calculation for the
luminance macroblock/4 individual blocks.
As it is there is no chrominance motion vector in
the bitstream syntax..
Thanks,
Mithun Nayak
-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf
Of
cloverleafland   mail.hongkong.com
Sent: Monday, October 28, 2023 4:03 PM
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] Re: Need Advice on
Motion Estimation for
MPEG-4 encoder ... pls advise....
Dear all,
I am currently working on a project to build a
MPEG-4 encoder. I got confusion on the process of
motion estimation. would anyone help explaining
why the motion estimation is done on 16x16 block
based but not in 8x8 block based?
Also, for a macroblock, it consists of 4 8x8 Y
blocks and 1 8x8 U block and 1 8x8 V block, would
anyone advise whetehr the motion estimation on Y,
U and V are done seperately or not?
Thanks so much....
Regards,
Clover
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