>Could you tell me where in the code of MPEG1or2VideoRTPSink.cpp (or >other files) can I find the frame size for IPB frames? Do you really mean "MPEG1or2VideoRTP*Sink*"? I.e., are you planning to transmit, or receive, MPEG video RTP packets? Ross Finlayson Live Networks, Inc. (LIVE555.COM) <http://www.live555.com/>