I am using gstreamer's rtsp library. But suddenly I found that GstRTSPHeaderField does not contain "Timestamp" which is defined in the RFC. And the only way to add it, is by modifying the code of gstreamer. I think, maybe some API to allow user to extend GstRTSPHeaderField will be a better choice. -- look to the things around you,the immediate world around you, if you are alive,it will mean something to you ——Paul Strand