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I have few doubts regarding frame boundaries in RTP packets.
First, If the marker bit is set, does it say that a new frame has begun(this is what I understand from RFC 3551)?
Second, According to what I read a frame starts with I-frame followed by P, B frames. Now, which field indicates this? And is the I frame has the marker bit set?
Third, If I need to find the start and end of a frame, would the check for marker bit suffice?
Thanks!
The RTP entry on the Wireshark Wiki provides a lot of information, including (edit) sample captures. You could exlore it, and it might answer some of your questions. If you’re going to write code to work with RTP, Wireshark is useful for monitoring/debugging.
Edit For your first question about Marker bit, this FAQ might help. Also, finding the frames (I, P, B) depends on the payload. There’s another question here that has an answer showing how I, P, B are found for MPEG. The h263-over-rtp.pcap has examples with I and P frames for H.263.