Telepresence
From Fixme.ch
Contents
Description
- (HD) Telepresence between FIXME and PTL
Current issues
- The telepresence part dosen't work
- OK Accelerated video decoding and display on the Raspi
- PTL outgoing bandwidth
- Build a wooden window-like frame with curtains
- gstreamer-omx crashes way too often!
- We're now using uv4l instead of gstreamer and it looks quite promising!
Hardware
- 2 Raspberry PI
- 2 Camera modules
- Custom printed box
Video streaming
Archives
Video Streaming
It works!
1. Install gstreamer with omx support
echo "deb http://vontaene.de/raspbian-updates/ . main" | sudo tee /etc/apt/sources.list.d/gstreamer.list sudo apt-get update sudo apt-get install libgstreamer1.0-0-dbg gstreamer1.0-tools libgstreamer-plugins-base1.0-0 gstreamer1.0-plugins-good gstreamer1.0-plugins-bad-dbg gstreamer1.0-omx gstreamer1.0-alsa
2. Install other required packages:
sudo apt-get install vlc
3. Configure /etc/rc.local to launch processes during startup:
RTSP
su pi -c "while :; do raspivid -t 86400000 -w 1280 -h 720 -fps 25 -b 256000 -n -o - | cvlc -vvv stream:///dev/stdin --sout '#rtp{sdp=rtsp://:1554/}' :demux=h264; sleep 60; done" &
su pi -c "while :; do gst-launch-1.0 rtspsrc location=rtsp://ptl.telepresence.fixme.ch:1554/ ! rtph264depay ! h264parse ! omxh264dec ! autovideosink; sleep 60; done" &
PTL raspi must use rtsp://fixme.telepresence.fixme.ch:1554/ instead.
Issues:
- NAT...
UDP
Issues:
- Client *must* be started first because of caps transmission
FIXME side
su pi -c "while :; do raspivid -t 999999 -w 1280 -h 720 -fps 25 -hf -b 1000000 -n -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=ptl.telepresence.fixme.ch port=5000 force-ipv4=true > /tmp/server.log 2>&1; sleep 60; done" & su pi -c "while :; do gst-launch-1.0 -v udpsrc port=5000 ! gdpdepay ! rtph264depay ! h264parse ! omxh264dec ! autovideosink > /tmp/client.log 2>&1; sleep 60; done" &
PTL side
su pi -c "while :; do raspivid -t 999999 -w 1280 -h 720 -fps 25 -hf -b 1000000 -n -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! udpsink host=fixme.telepresence.fixme.ch port=5000 force-ipv4=true > /tmp/server.log 2>&1; sleep 60; done" & su pi -c "while :; do gst-launch-1.0 -v udpsrc port=5000 ! gdpdepay ! rtph264depay ! h264parse ! omxh264dec ! autovideosink > /tmp/client.log 2>&1; sleep 60; done" &
TCP
/etc/rc.local côté FIXME:
su pi -c "while :; do raspivid -t 86400000 -w 1280 -h 720 -fps 25 -b 512000 -n -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=0.0.0.0 port=5000 > /tmp/server.log 2>&1; sleep 60; done" & su pi -c "while :; do gst-launch-1.0 -v tcpclientsrc host=ptl.telepresence.fixme.ch port=1554 ! gdpdepay ! rtph264depay ! h264parse ! omxh264dec ! autovideosink sync=false > /tmp/client.log 2>&1; sleep 60; done" &
/etc/rc.local côté PTL:
(note: pour l'instant le port 5000 est utilisé a fixme pour contourner les problemes de PAT/NAT au ptl en utilisant le meme port 1554 dans les 2 sens)
su pi -c "while :; do raspivid -t 86400000 -w 1280 -h 720 -fps 25 -b 256000 -vf -hf -n -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=0.0.0.0 port=1554; sleep 60; done" & su pi -c "while :; do gst-launch-1.0 -v tcpclientsrc host=fixme.telepresence.fixme.ch port=5000 ! gdpdepay ! rtph264depay ! h264parse ! omxh264dec ! autovideosink sync=false; sleep 60; done" &
Test depuis un PC:
gst-launch-1.0 -v tcpclientsrc host=YOUR-PI-IP-ADDRESS port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false
CEC - TV Screen control through HDMI
Reference: http://raspberrypi.stackexchange.com/questions/7054/cec-wake-up-command
git clone git://github.com/Pulse-Eight/libcec.git git cd libcec ./configure --with-rpi-include-path=/opt/vc/include --with-rpi-lib-path=/opt/vc/lib --enable-rpi make sudo make install
Switch the TV screen on:
echo 'on 0' | /usr/local/bin/cec-client -s
Switch the TV screen off:
echo 'standby 0' | /usr/local/bin/cec-client -s
Server
$ sudo raspivid -p 0,-100,500,500 -t 0 -o - -w 1280 -h 720 -fps 25 -b 1000000 | cvlc -vvv stream:///dev/stdin --sout '#rtp{sdp=rtsp://:9000/}' :demux=h264
Do do not forget to firewall access to the service!
Client
$ omxplayer -o hdmi -s --live rtsp://1.2.3.4:9000/
Network (@PTL)
iptables -t nat -A PREROUTING -p tcp --dport 5000 -j DNAT --to-destination raspi_internal_ip:5000
#ACTION SOURCE DEST PROTO DEST PORT DNAT net loc:local-IP-address[:local-port] protocol port-number DNAT net loc:raspberrypi udp 5000
Automation with Puppet
The basic idea is to develop are shared puppet recipe hosted in a git repository to allow multiple raspi managed by different entities to all share the same verified configuration. This will hopefully provide insurance that the system really works point-to-point and that there's no way to spy in-between.
Setup from scratch
$ whoami pi $ sudo apt-get install -y puppet $ git clone ssh://gitolite@git.fixme.ch:1337/telepresence # send your ssh public ssh to François $ sudo ~/telepresence/run.sh
Logs
All puppet run results are sent to a publicly accessible e-mail address.
