====== Video Streaming ======

Currently testing the following stream to local Janus:

===== VP8 =====
This command runs vp8 encoding with some cpu optimization:
<code>
gst-launch-1.0 pulsesrc ! queue ! opusenc ! rtpopuspay ! udpsink host=127.0.0.1 port=8003 rpicamsrc 
preview=false ! videoconvert ! video/x-raw, framerate=30/1, width=640, height=480 ! vp8enc cpu-used=5
threads=3 deadline=1 ! rtpvp8pay ! udpsink host=127.0.0.1 port=8004 sync=false
</code>

With these Janus settings
<code>
[vp8-rpi]
type = rtp
id = 10
description = VP8 live stream coming from gstreamer on Raspberry Pi
audio = yes
video = yes
videoport = 8004
audioport = 8003
audiopt = 111
audiortpmap = opus/48000/2
videopt = 100
videortpmap = VP8/90000
</code>

===== H264 =====
H264 Encoding is not supported well on Chrome.

<code>
gst-launch-1.0 rpicamsrc preview=false ! video/x-raw,width=1024,height=768 ! x264enc speed-preset=ultrafast
tune=zerolatency byte-stream=true bitrate=5000 threads=1 ! h264parse config-interval=1 ! rtph264pay ! 
udpsink host=127.0.0.1 port=8004
</code>

This one is nice
<code>
gst-launch-1.0 rpicamsrc preview=false vflip=true ! x264enc tune=zerolatency speed-preset=ultrafast
qp-min=18  pass=5 quantizer=21 ! video/x-h264,width=640,height=480,framerate=30/1 ! rtph264pay ! udpsink
host=127.0.0.1 port=8004 sync=false
</code>

And with synced audio:
<code>
gst-launch-1.0 pulsesrc ! queue ! opusenc ! rtpopuspay ! udpsink host=127.0.0.1 port=8003 rpicamsrc
preview=false vflip=true ! x264enc tune=zerolatency speed-preset=ultrafast qp-min=18 pass=5 quantizer=21 !
video/x-h264,width=640,height=480,framerate=30/1 ! rtph264pay ! udpsink host=127.0.0.1 port=8004 sync=false
</code>

Lower the CPU Usage
<code>
gst-launch-1.0 pulsesrc ! queue ! opusenc ! rtpopuspay ! udpsink host=127.0.0.1 port=8003 rpicamsrc 
preview=false ! x264enc tune=fastdecode speed-preset=1 pass=5 quantizer=30 ! video/x-
h264,width=640,height=480,framerate=30/1 ! rtph264pay ! udpsink host=127.0.0.1 port=8004 sync=false
</code>

Using JANUS Gateway's streaming plugin configured as such:
<code>
[h264-sample]
type = rtp
id = 10
description = H.264 live stream coming from gstreamer
audio = yes
video = yes
videoport = 8004
audioport = 8003
audiopt = 111
audiortpmap = opus/48000/2
videopt = 126
videortpmap = H264/90000
videofmtp = profile-level-id=42e01f\;packetization-mode=1
</code>

===== Pulse Audio =====

Auto start pulse audio on Raspbian - **/etc/systemd/system/pulseaudio.service**
<code>
[Unit]
Description=PulseAudio system server

[Service]
Type=simple
ExecStart=/usr/bin/pulseaudio --system --realtime --log-target=journal

[Install]
WantedBy=multi-user.target
</code>

**Sources**
  * [[https://groups.google.com/forum/#!topic/meetecho-janus/k2_oz0Kptdw]]
  * [[https://groups.google.com/forum/#!topic/meetecho-janus/KyEuS9I9B50]]
  * [[https://www.rs-online.com/designspark/building-a-raspberry-pi-2-webrtc-camera]]
  * [[https://raspberrypi.stackexchange.com/questions/26675/modern-way-to-stream-h-264-from-the-raspberry-cam]]