Simulate RTP stream with VLC fails - what does the gst-launch command do (specifics)?

[W]

This question is about the RTP streaming example/tutorial on the Kurento repo. To simulate an RTP stream the following gst-launch command was used. Everything works as expected on my machine. 

However, I wish to know what this command is comprised of, as I would like to simulate an RTP stream using a different tool, such as VLC.

All of my attempts with VLC have failed and I could not find any other helpful references online. No errors or logs anywhere, the stream simply does not show up on my application server.

Following is the gst-launch command:

I am asking this here as it was used in the official tutorial and I'd like to know what these parameters and flags are (especially SELF_ASSRC and SELF_VSSRC). 

Any help is appreciated!

PEER_A=33954 PEER_V=42342 PEER_IP=localhost \

SELF_PATH="video.mp4" \

SELF_A=5006 SELF_ASSRC=445566 \

SELF_V=5004 SELF_VSSRC=112233 \

bash -c 'gst-launch-1.0 -e \

  rtpbin name=r sdes="application/x-rtp-source-sdes,cname=(string)\"user\@example.com\"" \

  filesrc location="$SELF_PATH" ! decodebin name=d \

  d. ! queue ! audioconvert ! opusenc \

    ! rtpopuspay ! "application/x-rtp,payload=(int)96,clock-rate=(int)48000,ssrc=(uint)$SELF_ASSRC" \

    ! r.send_rtp_sink_0 \

  d. ! queue ! videoconvert ! x264enc tune=zerolatency \

    ! rtph264pay ! "application/x-rtp,payload=(int)103,clock-rate=(int)90000,ssrc=(uint)$SELF_VSSRC" \

    ! r.send_rtp_sink_1 \

  r.send_rtp_src_0 ! udpsink host=$PEER_IP port=$PEER_A bind-port=$SELF_A \

  r.send_rtcp_src_0 ! udpsink host=$PEER_IP port=$((PEER_A+1)) bind-port=$((SELF_A+1)) sync=false async=false \

  udpsrc port=$((SELF_A+1)) ! r.recv_rtcp_sink_0 \

  r.send_rtp_src_1 ! udpsink host=$PEER_IP port=$PEER_V bind-port=$SELF_V \

  r.send_rtcp_src_1 ! udpsink host=$PEER_IP port=$((PEER_V+1)) bind-port=$((SELF_V+1)) sync=false async=false \

  udpsrc port=$((SELF_V+1)) ! tee name=t \

    t. ! queue ! r.recv_rtcp_sink_1 \

    t. ! queue ! fakesink dump=true async=false'

[Micael Gallego]

Take a look to this page:

https://doc-kurento.readthedocs.io/en/stable/knowledge/rtp_streaming.html

Best regards

Micael Gallego

Kurento / OpenVidu Project Lead

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[W]

Thanks, Micael, but I already went through this.

What I cannot understand is why, when I open two RTP streams from VLC (one for video, and one for audio), and send it to the kurento IP (and ports) - from this tutorial, I am not receiving anything. 

I am wondering if there is something else gst-launch is doing that VLC is missing.

Thanks

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