title: why not exist nginx module with rtsp?
body: <p>I am new with video knowledge, and i have searched several articles about it.
  Now i know <code>rtsp</code> protocol is for use in entertainment and communications systems to control streaming media servers, and <code>rtmp</code> is similar like it but for flash client.</p>
  
  <p>My question is there is a great module named <code>nginx-rtmp-module</code> with <code>nginx</code>, but not a module <code>rtsp</code> with <code>nginx</code>. Dose anyone know the reason?</p>