1 # Stream Desktop/Video/Webcam to Kodi/Beamer/other PCs
2 Gregor and I had a closer look at the following projects:
5 Simple WebRTC implementation in GO: https://github.com/adamyordan/laplace.git
6 Simple to compile and just works.
7 WebRTC actually uses SRTP (Secure Real-time Transport Protocol).
11 ./laplace -addr "[::]:8080" -tls=false
15 gstreamer has a WebRTC implementation.
16 The examples at https://github.com/centricular/gstwebrtc-demos.git work once
18 export OPENSSL_CONF=''
20 has been set (see https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/811)
22 Another maybe helpful link: https://developer.ridgerun.com/wiki/index.php?title=GstWebRTC_-_H264-Opus_Examples#Receive_Pipeline
25 Note that you have to close VLC and open it again for new streaming as VLC leaves the connections
26 open (I spent hours figuring out why http based streaming doesn't work - `netstat -4 --ip` is nice
27 for debugging in that respect).
31 The address has to be the address where the video should be streamed **to**. In the following
32 examples, a multicast address is used. It is either the IP address of the device receiving the video (unicast address) or a multicast address
33 like 239.255.12.42 (multicast addresses are between 224.0.0.0 and 239.255.255.255, some of
34 them being reserved, 239.0.0.0 to 239.255.255.255 are Organization-Local Scope so they are
36 https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml).
38 cvlc -vv --sout '#transcode{vcodec=h264,acodec=mpga,channels=2,vb=800,ab=128}:rtp{mux=ts,dst=239.255.12.42,sdp=sap,name="Geris Game"}' GerisGame.mp4
39 cvlc -vv --sout '#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100,scodec=none}:rtp{dst=239.255.12.42,port=5004,mux=ts,sap,name=Geris Game}' :no-sout-all :sout-keep GerisGame.mp4
40 cvlc -vv --sout '#transcode{vcodec=h264,acodec=mpga,channels=2}:rtp{mux=ts,dst=239.255.12.42,sdp=sap,name="Videokamera"}' v4l2:///dev/video0 # long latency
41 cvlc -vv --sout '#transcode{vcodec=h264,acodec=mpga,channels=2}:rtp{mux=ts,dst=239.255.12.42,sdp=sap,name="Desktop"}' screen:// # not convincing
44 cvlc rtp://239.255.12.42
48 For VLC, RTSP means RTSP combined with RTP.
51 We assume that the video source computer has the external IP 192.168.1.54.
52 Instead of rtsp://192.168.1.54:8554/ we could also use rtsp://192.168.1.54:8554/mystream.sdp
54 cvlc -vv --sout '#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100,scodec=none}:rtp{sdp=rtsp://:8554/}' :no-sout-all :sout-keep GerisGame.mp4
55 cvlc -vv --sout '#rtp{dst=239.255.12.42,port=1234,sdp=rtsp://192.168.1.54:8554/}' :no-sout-all :sout-keep GerisGame.mp4
59 The address needs to be the address of the source. Note the backslash at the end.
61 vlc rtsp://192.168.1.54:8554/
65 * Latency: The following options are said to reduce latency:
67 --network-caching=150 --clock-jitter=0 --clock-synchro=0
69 * Duplicating a stream is nice for debugging:
71 cvlc -vv --sout '#duplicate{dst=display,dst="transcode{vcodec=h264,acodec=mpga,channels=2,vb=800,ab=128}:rtp{mux=ts,dst=239.255.12.42,sdp=sap,name=Geris Game}"}' GerisGame.mp4
72 cvlc rtp://239.255.12.42
76 The address at the source side has to be the external one of the local computer.
79 cvlc -vv --sout '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:standard{access=http,mux=ogg,dst=0.0.0.0:8080}' GerisGame.mp4
83 vlc http://192.168.1.54:8080
87 The player built into code knows at least the following streaming protocols: http, rtsp.
89 https://kodi.wiki/index.php?title=Internet_video_and_audio_streams