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Version 4 (modified by Antoine Martin, 6 years ago) (diff)




This feature is experimental in version 0.17.

Known limitations and caveats - see #1113:

  • only support with Linux servers
  • work in progress, see #1030
  • there is no systray menu for it
  • framerate is low
  • black and white only, low resolution (hardcoded csc dependencies)
  • no support for multiple sessions per server..
  • detecting when devices are added or removed? (dbus?)
  • it uses too much bandwidth (mostly wasted too)
  • server setup requires an out of tree kernel module
  • etc...


Clients only rely on opencv and its python bindings. (the win32 installers include it, )

The server relies on a virtual video device, you must install the v4l2loopback kernel module from https://github.com/umlaeute/v4l2loopback. (build then just modprobe v4l2loopback).

The user running the xpra session must be able to access the video devices (ie: adding the user to the video group)


The server should work out of the box.

Until a systray menu is added, you must start the client with --webcam=on. (you can also specify which video device to use: --webcam=/dev/video2)


  • use the -d webcam debug flag
  • run python ./xpra/platform/xposix/webcam_util.py, the correct output looks like this:
    python ./xpra/platform/xposix/webcam_util.py 
    Found 1 virtual video device: