My understanding is that a GOP is almost self contained: the only thing it might need to be decoded properly would be a P-frames from the previous GOP. I don't think it's possible to cut off a stream start code from the rest of the mpeg data: all the start/end codes will be contained in the same GOP (that's for sure). I'm not too sure why some players complain, but it could be because the GOP is open (relies on a frame from the previous GOP to decode) perhaps?
jeanl
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