81d571507bf9d20600a866a2d9df53a6586a6aed
[toast/stream2beamer.git] / stream2beamer.md
1 # Stream Desktop/Video/Webcam to Kodi/Beamer/other PCs
2 Gregor and I had a closer look at the following projects:
3
4 # Laplace
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). 
8
9 IPv6+IPv4, and no TLS:
10
11     ./laplace -addr "[::]:8080" -tls=false
12
13 # gstreamer
14 * Supports RTP
15 * Supports webcam capture via v4l (video for linux)
16 * Supports screen capture via xmanager/ximagesrc
17 * Interesting URLs:
18   * WebRTC in one direction only: https://stackoverflow.com/questions/57430215/how-to-use-webrtcbin-create-offer-only-receive-video
19   * gstreamer to VLC via RTP: https://stackoverflow.com/questions/13154983/gstreamer-rtp-stream-to-vlc
20   * https://github.com/intel/gstreamer-media-SDK/issues/138
21   * https://developer.ridgerun.com/wiki/index.php?title=GstWebRTC_Pipelines
22   * https://developer.ridgerun.com/wiki/index.php?title=GstWebRTC_-_H264-Opus_Examples#Receive_Pipeline
23
24 ## WebRTC
25 gstreamer has a WebRTC implementation.
26 The examples at https://github.com/centricular/gstwebrtc-demos.git work once
27
28     export OPENSSL_CONF=''
29
30 has been set (see https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/811)
31
32 ## gstreamer examples
33     gst-launch-1.0 -v playbin uri=file:///home/philipp/tmp/GerisGame.mp4
34     
35 * https://stackoverflow.com/questions/33747500/using-gstreamer-to-capture-screen-and-show-it-in-a-window/33822024#33822024
36 * http://www.einarsundgren.se/gstreamer-basic-real-time-streaming-tutorial/
37 * https://gist.github.com/tetkuz/0c038321d05586841897
38 * https://gist.github.com/esrever10/7d39fe2d4163c5b2d7006495c3c911bb
39 * https://gist.github.com/nebgnahz/26a60cd28f671a8b7f522e80e75a9aa5
40     
41 # VLC
42 Note that you have to close VLC and open it again for new streaming as VLC leaves the connections
43 open (I spent hours figuring out why http based streaming doesn't work - `netstat -4 --ip` is nice
44 for debugging in that respect).
45
46 ## RTP
47 ### Source
48 The address has to be the address where the video should be streamed **to**. In the following
49 examples, a multicast address is used. It is either the IP address of the device receiving the video (unicast address) or a multicast address 
50 like 239.255.12.42 (multicast addresses are between 224.0.0.0 and 239.255.255.255, some of
51 them being reserved, 239.0.0.0 to 239.255.255.255 are Organization-Local Scope so they are
52 good candidates, see
53 https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml).
54
55     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
56     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
57     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
58     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
59
60 ### Player
61     cvlc rtp://239.255.12.42
62
63
64 ## RTSP
65 For VLC, RTSP means RTSP combined with RTP.
66
67 ### Source
68 We assume that the video source computer has the external IP 192.168.1.54.
69 Instead of rtsp://192.168.1.54:8554/ we could also use rtsp://192.168.1.54:8554/mystream.sdp
70
71     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
72     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
73
74
75 ### Player
76 The address needs to be the address of the source. Note the backslash at the end.
77
78     vlc rtsp://192.168.1.54:8554/
79
80
81 ## VLC Remarks
82 * Latency: The following options are said to reduce latency:
83
84       --network-caching=150 --clock-jitter=0 --clock-synchro=0
85
86 * Duplicating a stream is nice for debugging:
87
88       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
89       cvlc rtp://239.255.12.42
90
91
92 ## HTTP
93 The address at the source side has to be the external one of the local computer.
94
95 ### Source (server)
96     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
97
98 ### Player (client)
99
100     vlc http://192.168.1.54:8080
101
102
103 # Kodi
104 The player built into code knows at least the following streaming protocols: http, rtsp.
105
106 https://kodi.wiki/index.php?title=Internet_video_and_audio_streams