Difference between revisions of "Telepresence"

Revision as of 00:31, 31 July 2013

Description

• (HD) Telepresence between FIXME and PTL

Current issues

• Accelerated video decoding and display on the Raspi
• PTL outgoing bandwidth
• Build a wooden window-like frame with curtains

Hardware

• 2 (4?) Raspberry PI
• 2 Camera modules
• Custom printed box

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 1080 -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

pi@raspberrypi ~ $ gst-launch-1.0 -v udpsrc port=5000 ! gdpdepay ! rtph264depay ! h264parse ! omxh264dec ! autovideosink
pi@raspberrypi ~ $ raspivid -t 999999 -w 1080 -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=127.0.0.1 port=5000 force-ipv4=true

Issues:

• Client *must* be started first because of caps transmission

TCP

/etc/rc.local côté FIXME:

su pi -c "while :; do raspivid -t 86400000 -w 1080 -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=1554; 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; 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 1080 -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" &

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

Participants

• User:Francois
• User:Freestrom
• User:mic