title: how to make a live555 server do streaming by using a rtsp address instead a file
body: <p>I have been studying testOnDemandRTSPServer code and I want to do streaming by taking input from a live source by using a rtsp address. 
  I have read that I have to modify OnDemandServerMediaSubsession and createNewStreamSource() and createNewRTPSink() functions. 
  I don't know how to do this. I don't know how to start with this. I have been searching information via Internet but I haven't found anything. Please some help.</p>
  
  <p>Thanks</p>