screencasting.py

#!/usr/env/bin python3

import signal
import sys
import dbus
from gi.repository import GLib, GObject
from dbus.mainloop.glib import DBusGMainLoop

import soundcard

DBusGMainLoop(set_as_default=True)
loop = GLib.MainLoop()
bus = dbus.SessionBus()

screencast = bus.get_object('org.gnome.Shell.Screencast', '/org/gnome/Shell/Screencast')
screencast_iface = dbus.Interface(screencast, dbus_interface='org.gnome.Shell.Screencast')

default_speaker = soundcard.default_speaker()
pulse_audio_sink = default_speaker.id + '.monitor'

pipeline = (f'vp8enc min_quantizer=10 max_quantizer=50 cpu-used=5 deadline=1000000 threads=%T ! queue ! mux. '
            f'pulsesrc device={pulse_audio_sink} ! audioconvert ! opusenc bitrate=128000 bitrate-type=vbr ! queue ! mux. '
            f'webmmux name=mux')

print(screencast_iface.Screencast(
    '/home/timothy-gu/Videos/test2.webm',
    {
        'framerate': 30,
        'draw-cursor': True,
        'pipeline': pipeline
    }))

def signal_handler(sig, frame):
    print(screencast_iface.StopScreencast())
    sys.exit(1)

signal.signal(signal.SIGINT, signal_handler)

loop.run()