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While I am aware of rfbproxy and ffmpeg's x11grab capability, all the examples online seem to be aimed at users wanting to record their own sessions. My usage model is to maintain a (reasonably) trustworthy audit record of remote access to a system.

My problem is how to reconcile the files these create with the session metadata (notably the authenticated username). If the recording is started from within the session then I can capture the username, although this will expose the invocation to the user (e.g. if done via an XDG autostart).

(logging the input events might be a viable alternative to full video recording)

If the start/stop of the recording is not invoked from the users session, then how do I synchronize the start/stop with the beginning/ed of the users session?

Users will be connecting to a Linux desktop (I've not started thinking about how Wayland fits in all this) via VNC.

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User "balanceofpain" on Reddit suggests:

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FFmpeg/avconv can do that. You'd have to start it as a different user so the person audited would be unable to interfere with it. The command will be similar to:

 avconv -f x11grab -s 1366x768 -r 25 -i :0.0 /tmp/out.mpg

Remember to allow this user access to X with xhost +si:localuser:<auditorusername>

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Hence I could use XDG's autostart but seperate privileges with sudo (to prevent user killing task). The remaining question is whether the recording ends at the end of the session.

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