v4l2loopback

安装

$ make && sudo make install
$ sudo depmod -a

装载模块

sudo modprobe v4l2loopback video_nr=12 max_buffers=2 exclusive_caps=1 card_label="VirtualCam"

卸载模块

sudo modprobe -r v4l2loopback

设置

v4l2loopback-ctl set-timeout-image -t 3000 /dev/video0 service-unavailable.png

示例

• play a mp4 file to a virtual camera

gst-launch-1.0 -v -m --gst-debug=5 filesrc location=talk.mp4 ! decodebin ! nvvideoconvert ! identity drop-allocation=1 ! v4l2sink device=/dev/video12 

• send video stream from local camera

# send udp packets of video 
gst-launch-1.0 v4l2src ! 'video/x-raw, width=640, height=480, \
framerate=30/1' ! videoconvert ! x264enc pass=qual quantizer=20 \
tune=zerolatency ! rtph264pay ! udpsink host=192.168.104.236 port=1234


# receive udp packet and display video
gst-launch-1.0 udpsrc port=1234 ! "application/x-rtp, payload=127" ! \
rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink

# receive udp packet and display to video1
gst-launch-1.0 udpsrc port=1234 ! "application/x-rtp, payload=127" ! \
rtph264depay ! avdec_h264 ! videoconvert ! v4l2sink device=/dev/video1

参考

• https://github.com/umlaeute/v4l2loopback

• https://aweirdimagination.net/2020/07/12/virtual-web-cam-using-gstreamer-and-v4l2loopback/