[Mp4-tech] H264 RTP Timestamp

[Jerry Johns]

Hello, 
          I'm currently in the process of writing a H264 packetizer, and I'm
encountering some difficulty composing the RTP timestamps; in the H264
sample vids I've had, there have been samples which
Had SEI messages, indicating a picture_timing msg which means I can extract
the timing info (is the timing a PTS? Where does the reference 90khz come
from?) - I've also had samples which don't have an SEI, (just parameter sets
and slices), in which case, how do I compose the 32-bit timestamp? 
Thank you
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