gnome-screencast-vaapi.py

import dbus
import sys


def get_object(bus):
    return bus.get_object('org.gnome.Shell.Screencast', '/org/gnome/Shell/Screencast')


def main(filename: str):
    bus = dbus.SessionBus()
    iface = dict(dbus_interface='org.gnome.Shell.Screencast')
    get_object(bus).StopScreencast(**iface)
    options = {
        "draw-cursor": True,
        "pipeline": ' ! '.join([
            'vaapipostproc',
            #'video/x-raw,format=NV12,width=1920,height=1200,max-framerate=60/1',
            'video/x-raw,format=NV12,max-framerate=60/1',
            'queue',
            'vaapih264enc',
            'video/x-h264,profile=main',
            'queue',
            'h264parse',
            'matroskamux',
        ]),
        "framerate": 60,
    }
    (status, filename) = get_object(bus).Screencast(filename, options, **iface)
    if not status:
        raise Exception("Failed to start recording, look through logs `journalctl --user -afu dbus.service`")
    input(f"writing to {filename}. press enter to stop")
    get_object(bus).StopScreencast(**iface)


if __name__ == '__main__':
    main(sys.argv[1])