v4l2loopback example

gistfile1.txt

#!/bin/sh -e

# Dependencies
apt install -y v4l2loopback-dkms v4l2loopback-utils gstreamer1.0-plugins-good
apt install -y gstreamer1.0-plugins-bad # h264parse
apt install -y gstreamer1.0-libav # H.264 

# Reset module state
modprobe -r v4l2loopback
modprobe v4l2loopback

# Setup camera stream
v4l2-ctl -d /dev/video0 -c timeout=3000
v4l2loopback-ctl set-fps 25 /dev/video0
v4l2loopback-ctl set-caps "video/x-raw,format=UYVY,width=640,height=480" /dev/video0

v4l2loopback-ctl set-timeout-image testcard.png  /dev/video0

# You need to wait here, until the software has started to grab the webcam

gst-launch-1.0 -v videotestsrc pattern=snow ! "video/x-raw,width=640,height=480,framerate=25/1,format=UYVY" ! v4l2sink device=/dev/video0

gst-launch-1.0 uridecodebin uri=file:///home/pi/testcard.mp4 ! decodebin name=demux demux. ! videoconvert ! videoscale ! 'video/x-raw,format=UYVY,width=640,height=480,framerate=25/1' ! v4l2sink device=/dev/video0