[Mp4-tech] [MP4tech][Mpeg 4 Video] Parsing Mpeg 4 headers from a media stream

[Herbert Thoma]

kc manikandan wrote:
> Hello,
> 
> I am working in Mpeg4 parsing. I am looking for VOS, VO and VOL headers 
> in the bit stream I received from a mobile phone ( from a video 
> session). I did not find any of the headers in this elementary stream 
> (multiplexed audio and video) except for the VOP header.
> 
> I thought that if it is an mpeg4 session the video stream  will be 
> having all the above mentioned headers???. How can i know what type of a 
> stream it is???  I am new to this field and it would be helpful if 
> someone can give me an idea about this.

Most likely the VS, VO and VOL headers are conveyed during
session setup, e.g. via RTSP. Only the Access Units (VOPs)
are then conveyed in the stream, e.g. via RTP.
  Herbert.
> Regards
> Mani.
> 
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-- 
Herbert Thoma
Head of Video Group
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/