title: How to send data from a file to webrtcbin element in gstreamer?
body: <p>I am a beginner with gstreamer so bear with me.</p>
  
  <p>I have a working pipeline where audio and video from a test source is sent to the webrtcbin element used to send out offer. Pipeline is as follows:</p>
  
  <pre><code>PIPELINE_DESC = '''
  webrtcbin name=sendrecv stun-server=stun://stun.l.google.com:19302
   audiotestsrc is-live=true wave=red-noise ! audioconvert ! audioresample ! queue ! opusenc ! rtpopuspay !
   queue ! application/x-rtp,media=audio,encoding-name=OPUS,payload=96 ! sendrecv.
   videotestsrc is-live=true pattern=ball ! video/x-raw,width=320,height=240 ! videoconvert ! queue ! x264enc ! rtph264pay !
   queue ! application/x-rtp,media=video,encoding-name=H264,payload=97 ! sendrecv.
  '''
  </code></pre>
  
  <p>However doing this consumes a lot of CPU/Memory as gstreamer has to encode audio/video. Hence I was to use a pre-recorded file to lower the resource usage.</p>
  
  <p>I want to use a sample file (sample.mp4) to send audio and video to the webRTCbin element. The mp4 file has H264 video and AAC audio. I have tried a lot of combinations of elements but it is not working. Could you please help me correct my pipeline? </p>
  
  <pre><code>PIPELINE_DESC = '''
  webrtcbin name=sendrecv stun-server=stun://stun.l.google.com:19302
   filesrc location=sample.mp4 ! decodebin ! audioconvert ! sendrecv.
   filesrc location=sample.mp4 ! decodebin ! videoconvert ! sendrecv.
  '''
  </code></pre>
  
  <p>Many thanks in advance.</p>