[Mp4-tech] Parsing GOV Headers - Urgent

[Stefan A. Goor]

Hey All,
Please help if you can, I really need to resolve this problem
as soon as possible.
I am receiving MPEG-4 vidoe streams in RTP and I am trying to 
parse out the individual VOPs using the start codes in the video 
content and RTP marker bit to determine the  end of the VOPS.
This works fine until I receive a packet that contains a GOV
i.e. startcode 0x1b3, as I can't seem to parse out the I frame
from this packet.
I have tried parsing ahead in the packet payload to find the 
start of the I frame i.e. searching for vop_start_code 0x1b6,
but I couldn't find any.  
The next packet that I receive is a P VOP so I assume the I
VOP is contained in it the GOV packet somewhere but how do I
parse it out?
Thanks,
Stefan