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

[kc manikandan]

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.
Regards
Mani.
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