[M4IF Technotes] BVOPs question

[Ricardo Torres]

You can try to use higher quantization step for the B-frame. (I don´t  know
if it is
possible with the Microsoft MPEG-4 coder).
If you use higher quantization steps for the B-frames  the overall file size
of the video will decrease,
but the global quality hardly decrease, due to the B-Frames are not used as
reference for coding
the video sequence.
Best regards,
Ricardo
----- Original Message -----
From: "Zhen-Zhong Chen" <zhenzhongc   hotmail.com>
To: "Klaus Leopold" <klaus   itec.uni-klu.ac.at>; "list-m4if"
<technotes   lists.m4if.org>
Sent: Tuesday, September 17, 2023 5:18 AM
Subject: Re: [M4IF Technotes] BVOPs question
> For B-frame, the compression rate depends on the efficiency of motion
estimation and the temporal distance between two reference frames. I notice
that the sequence Forman has a rapid modtion and changing background. The
compression rate decreases in this case.
>
> Regards,
>
> Zhenzhong
>
> ----- Original Message -----
> From: Klaus Leopold <klaus   itec.uni-klu.ac.at>
> To: list-m4if <technotes   lists.m4if.org>
> Sent: Monday, September 16, 2023 4:21 PM
> Subject: [M4IF Technotes] BVOPs question
>
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Hi *,
> >
> > I'm using the Microsoft-FPDAM MPEG-4 codec for encoding videos and have
a
> > question about BVOPs:
> >
> > I encoded different streams (ISO conformance - foreman, silent, etc.)
with
> > differnt numbers of B-VOPs. I noticed that on adding B-Frames the
overall
> > file size of the video INCREASES. The overhead for the silent stream is
for
> > example 10 % if I encode it with 2 B_between_P and 9 P_between_I to 0
> > B_between_P and 24 P_between_I.
> >
> > The theory about B-Frames says that they provide the highest level of
> > compression. So my logical implication is that videos with B-Frames
should be
> > smaller than videos without B-Frames. Why does the Why does the FPDAM
codec
> > bahave different??
> >
> > Klaus
> > -----BEGIN PGP SIGNATURE-----
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