Dear Ross,<br> <br> I used openRTSP to get a H264 file in mp4 format from Darwin Streaming Server. I encoded into the H264 with image size 352x288 by x264 and encapsulated into the mp4 file using MP4Box. I tried the command of "openRTP -v -4 rtsp://192.168.0.1/a01.mp4" and however the received mp4 file is in wrong image size, which is default size in the program. So I looked to the SDP file, as shown in the below:<br> v=0<br> o=- 2209842806 1145641443000 IN IP4 142.92.36.55<br> s=\a01_hinted.mp4<br> u=http://epox3.dgbt.crc.ca<br> e=admin@epox3.dgbt.crc.ca<br> c=IN IP4 0.0.0.0<br> b=AS:113<br> t=0 0<br> a=maxprate:26.000000<br> a=range:npt=0- 12.00000<br> a=control:*<br> m=video 0 RTP/AVP 96<br> b=AS:113<br> b=TIAS:107<br> a=maxprate:26<br> a=rtpmap:96 H264/90000<br> a=control:trackID=3<br> a=cliprect:0,0,288,352<br> a=framesize:96 352-288<br> a=fmtp:96 packetization-mode=1;profile-level-id=4D0028;sprop-parameter-sets=Z00AKJZkCwS0IAAAfQAADqYQgA==,aO48gA==<br>
a=range:npt=0- 12.00000<br> <br> I found there was no the line of "a=x-dimensions:<width>,<height>" to update the default width and height by the real dimension. I just found the lines of "a=cliprect:0,0,288,352" and "a=framesize:96 352-288". <br> <br> First, I didn't find any explanation about the sematics for these two attributes on Internet. Could you explain it in detail? So I am not so sure if I am doing right in write one more member function in the MediaSubsession class to parse either one of them to update the default image dimension by real one.<br> <br> Thank you for your help!<br> <BR><BR>Hong Liu<br>------------------------------<p> 
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