[M4IF Technotes] Few Queries on streaming video profile!!!

[Peter Haighton]

Hello Gautum,
The maximum is indeed 2048 bits.
Of course the packet size is only used when dealing with data
partitioning.
Peter
--
Peter Haighton
VideoSpheres Inc.
84 Hines Road
Kanata, Ontario
Canada, K2K 3G3
Tel: (613) 270-9646 x3022
Fax: (613) 271-9442
email: peterh   VideoSpheres.com
See http://www.m4if.org for the latest on MPEG-4
-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org]On Behalf Of Gautam Kumar
Sent: Monday, November 19, 2023 1:19 AM
To: technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] Few Queries on streaming video profile!!!
Dear All,
 Thanks to Mr. Rob and Mr. Peter Haighton for their reply.
I am wondering at the encoder end for Simple Profile level 1 the Maximum
Video Packet length is given as 2048 bits
in ISO/IEC 14496?2:1999/FDAM 1:2000(E), page 497, table N-1.
	Is that the maximum size or we can add one more Macroblock data or
some more bits in that at the Encoding Side?
In ISO reference code for decoder, it adds one more macroblock after it
exceeds the Video Packet lengtht. But there the Video Packet lengh is well
below 2048 bits.
Awaiting reply
Warm Rgds
Gautam
-----Original Message-----
From: Rob Koenen [mailto:rkoenen   intertrust.com]
Sent: Saturday, November 10, 2023 7:32 AM
To: Gautam Kumar; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] Few Queries on streaming video profile!!!
Gautam,
> 1) level 0 specification is in amd 3 or amd 4, as i can infer from
> http://mpeg.telecomitalialab.com/workplan.htm
> 	that amd 4 is not in the list.

That is because amendments got renumbered as new versions are issued.
Difficult to follow at times, but we need to live with it.
The numbers in the workplan are now relative to the 2001 edition
of MPEG-4 Visual. You are now looking at AMD2 (Simple   L0) and
AMD3 (Simple Scalable @ L0)
> 2) does level 0 puts restriction on the size of frame to be
> multiple of 16 ?
> (ofcourse size should not be more that QCIF)

yes.
Length <= 176
Height <= 144
It only works in multiples of full macroblocks.
MPEG-4 Simple Profile Level 0 has the following restrictions
when compared to Level 1:
 a)	The maximum frame rate shall be 15 frames per second;
 b)	The maximum f_code shall be 1;
 c)	The intra_dc_vlc_threshold shall be 0;
 d)	The maximum horizontal luminance pixel resolution shall be 176
 pels/line;
 e)	The maximum vertical luminance pixel resolution shall
 be 144 pels/VOP;
 f)	If AC prediction is used, the following restriction
 applies : QP value
 shall not be changed within a VOP (or within a video packet if video
 packets are used in a VOP). If AC prediction is not used, there are no
 restrictions to changing QP value.
> 3) Regarding motion estimation and compensation, does it support:
> 	a) mb_type = 2 ; that is does it support different motion vectors
> for all 4 luminance blocks within the same macroblock,

Yes
> 	b) half pel motion compensation and

yes
> 	c) unrestricted motion compensation.

yes
Best,
Rob
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