[Mp4-tech] MPEG4 header

[Herbert Thoma]

mayank agarwal wrote:
> Many thanks for your reply.
> 
> I don't have aceess to MPEG-4 standard,please tell me
> from where can i get that, if i can download from any
> site free or if anyone has one please sent me by mail.

If you are MPEG member the latest edition of MPEG-4
visual is w5546. If you are not MPEG member you have
to buy the standard from ISO (ISO/IEC 14496-2:2004).
> In encoded stream for MPEG-4 visual simple profile
> i am getting first four values(decimal) 0 0 1 182,i
> think that is the header because for succesive frames
> it remains constant.

0x00 0x00 0x01 0xb6 is the so called VOP header start
code. Every VOP (frame) starts with this code.
Kind regards,
  Herbert.
> I just want to know whether it is right or wrong,how
> can i interpret that header.
>                  Thanks,
>      
> Regards,
> Mayank
> 
> 
> 
> --- Sassan Pejhan <SassanP vbrick.com> wrote:
> 
>>Hi Mayank,
>>
>>The headers for MPEG-4 Part2 and H.263 are defined
>>in their respective specs (ISO/IEC 14496-Part 2 and
>>ITU-T
>>Recommendation H.263, respectively).
>>
>>The header sequences are not identical although
>>MPEG-4 Part2
>>is backwards compatible with H.263 baseline (i.e.
>>the 1996
>>version of H.263 which did not include additions in
>>the
>>later H.263+ and H.263++ versions) - and is referred
>>to 
>>as VOP Plane with Short Headers in the MPEG-4 specs.
>>
>>For code on packing MPEG-4 bitstreams into RTP
>>packets
>>per RFC 3016, take a look at the MPEGIP web page 
>>(www.mpeg4ip.net). You may also want to look at the
>>ISMA 1.0 specifications (avaliable from www.isma.tv)
>>for more elaborate documentation.
>>
>>Regards,
>>Sassan
>>
>>-----Original Message-----
>>From: mayank agarwal [mailto:may_ank77 yahoo.com]
>>Sent: Sunday, April 17, 2024 9:06 PM
>>To: mp4-tech lists.mpegif.org
>>Subject: [Mp4-tech] MPEG4 header
>>
>>
>>
>>Hi all,
>> I have the following doubts regarding MPEG-4 header
>>1.What is the standard header bit sequence of MPEG4
>>visual simple profile.
>>2.Is header for MPEG-4 video or H.263 is same or
>>different.
>>3.Is header in encoded bit stream of MPEG-4 same for
>>frame based encoding and packet based encoding.
>>4.What is the standard bit sequence of header of
>>H263.
>>
>>How to convert the frame based encoding in MPEG4 to
>>packet based encoding according to RTP rfc 3016
>>format
>>Is there any document or code sequence available
>>which
>>tells how to do that.
>>
>>        Many thanks in advance.
>>                                  Regards,
>>                                  Mayank
>>
>>
>>		
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-- 
Herbert Thoma
Group Manager Video
Multimedia Realtime Systems Department
Fraunhofer IIS
Am Wolfsmantel 33, 91058 Erlangen, Germany
Phone: +49-9131-776-323
Fax:   +49-9131-776-399
email: tma iis.fhg.de
www: http://www.iis.fhg.de/