eefe5b7d0797abaca614a2d53e0670d200a66e4d
[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 * https://salsa.debian.org/debconf-video-team/ansible/-/blob/master/roles/voctomix/templates/videoteam-stream.j2
41 * https://github.com/xfxf/video-scripts/blob/master/michael/youtube-live.sh
42   (and others in the same repo)
43     
44 # VLC
45 Note that you have to close VLC and open it again for new streaming as VLC leaves the connections
46 open (I spent hours figuring out why http based streaming doesn't work - `netstat -4 --ip` is nice
47 for debugging in that respect).
48
49 ## RTP
50 ### Source
51 The address has to be the address where the video should be streamed **to**. In the following
52 examples, a multicast address is used. It is either the IP address of the device receiving the video (unicast address) or a multicast address 
53 like 239.255.12.42 (multicast addresses are between 224.0.0.0 and 239.255.255.255, some of
54 them being reserved, 239.0.0.0 to 239.255.255.255 are Organization-Local Scope so they are
55 good candidates, see
56 https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml).
57
58     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
59     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
60     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
61     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
62
63 ### Player
64     cvlc rtp://239.255.12.42
65
66
67 ## RTSP
68 For VLC, RTSP means RTSP combined with RTP.
69
70 ### Source
71 We assume that the video source computer has the external IP 192.168.1.54.
72 Instead of rtsp://192.168.1.54:8554/ we could also use rtsp://192.168.1.54:8554/mystream.sdp
73
74     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
75     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
76
77
78 ### Player
79 The address needs to be the address of the source. Note the backslash at the end.
80
81     vlc rtsp://192.168.1.54:8554/
82
83
84 ## VLC Remarks
85 * Latency: The following options are said to reduce latency:
86
87       --network-caching=150 --clock-jitter=0 --clock-synchro=0
88
89 * Duplicating a stream is nice for debugging:
90
91       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
92       cvlc rtp://239.255.12.42
93
94
95 ## HTTP
96 The address at the source side has to be the external one of the local computer.
97
98 ### Source (server)
99     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
100
101 ### Player (client)
102
103     vlc http://192.168.1.54:8080
104
105
106 # Kodi
107 The player built into code knows at least the following streaming protocols: http, rtsp.
108
109 https://kodi.wiki/index.php?title=Internet_video_and_audio_streams