Samier, Could you please put your "test.m4v" file on a web server, and send the URL, so we can download and test this for ourselves? (I'm assuming that this problem occurs with "testOnDemandRTSPServer" as the server, and "openRTSP" as the client, using unmodified LIVE.COM code.) Ross Finlayson LIVE.COM <http://www.live.com/>