[M4IF Technotes] Start code

[Yu, Heeyeol]

Dear Dokic
I am not good at MPEG4, but just start to study.
Could you tell me where I can get that standard, ISO/IEC spec 14496-2?
BTW, what is S frame? Is made frequent? What I considered for rating
frame are I/P/B frames only because most of papers mentioned them only.
But sometimes I got frame saying 0x000001B650 which means S frame.
I got this frame using MPEG4IP tools which used ISO MPEG4 coding scheme.
BTW I got frame saying 0x3e06540c. What is this one of I/P/B/S frame
splitted? As I know RFC strongly recommends to use that in one RTP.
Could you tell me the packet format of MPEG4 in RTP? Which RFC?
Best regards
======================================
 John Heeyeol Yu
 Computer Science Department
 H: 310-838-2396
 O: 310-206-8589
 http://www.cs.ucla.edu/~heeyeoly
======================================
-----Original Message-----
From: Dokic, Miroslav [mailto:miroslav.dokic   cirrus.com] 
Sent: Tuesday, June 24, 2023 5:58 PM
To: 'Yu, Heeyeol'; Dokic, Miroslav; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] Start code
Dear Yu,
You need to get the ISO/IEC spec 14496-2
and check the section 6.3.5. where vop_coding_type is specified,
as a 2 bit field:
00 --- I coded vop
01 --- P coded vop
10 --- B coded vop
11 --- S (sprite)
This 2 bit field arrives after 32 bit vop_start_code of
0x000001B6.
Regards,
Miroslav
-----Original Message-----
From: Yu, Heeyeol [mailto:heeyeoly   CS.UCLA.EDU]
Sent: Tuesday, June 24, 2023 5:44 PM
To: 'Dokic, Miroslav'; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] Start code
Dear Dokic
Could you tell the standard mentioning the start code of I/P/B
frame of
MPEG4?
Actually I don't know the helpful document and where I can get
that.
Best regards
======================================
 John Heeyeol Yu
 Computer Science Department
 H: 310-838-2396
 O: 310-206-8589
 http://www.cs.ucla.edu/~heeyeoly
======================================
-----Original Message-----
From: technotes-admin   lists.m4if.org
[mailto:technotes-admin   lists.m4if.org] On Behalf Of Dokic,
Miroslav
Sent: Tuesday, June 24, 2023 5:33 PM
To: 'cloverleafland   mail.hongkong.com'; technotes   lists.m4if.org
Subject: RE: [M4IF Technotes] Start code
Clover,
MP3 and AAC do not have the start_codes in the form of 0x000001,
rather the audio frame starts with 12 bit field 0xfff. 
This is true for both MP3 and AAC. More bits after 0xfff are
needed
to figure out is it MP3 or AAC (or MPEG-1/2 Layer I or II for
that matter) 
Best regards,
Miroslav
-----Original Message-----
From: cloverleafland   mail.hongkong.com
[mailto:cloverleafland   mail.hongkong.com]
Sent: Tuesday, June 24, 2023 1:31 AM
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] Start code
Dear all,
Would any one know whether MP3 or AAC have start_code? if yes,
what are the start code? Thanks a lot.
regards,
clover
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