title: gst-launch: 'SETUP stream 0 and SETUP stream 1'
body: <p>When I run <code>gst-launch-1.0 rtspsrc location='rtspt://localhost:8554/mystream'</code>, the output suggests that two streams are being established:</p>
  <pre><code>Setting pipeline to PAUSED ...
  Pipeline is live and does not need PREROLL ...
  Progress: (open) Opening Stream
  Progress: (connect) Connecting to rtspt://localhost:8554/mystream
  Progress: (open) Retrieving server options
  Progress: (open) Retrieving media info
  Progress: (request) SETUP stream 0
  Progress: (request) SETUP stream 1
  Progress: (open) Opened Stream
  Setting pipeline to PLAYING ...
  New clock: GstSystemClock
  Progress: (request) Sending PLAY request
  Progress: (request) Sending PLAY request
  Progress: (request) Sent PLAY request
  </code></pre>
  <p>Does anyone know why two streams (stream 0 and stream 1) are needed? Do the two streams carry different data? Is there any way to use just one stream?</p>