Lossless screencast for Gnome Shell (supports wayland and X)

screenrecord-gnome.py

#!/usr/bin/env python3
from dbus import SessionBus, Interface
from os import getcwd, path
from sys import argv

BUS_NAME = 'org.gnome.Shell.Screencast'
PATH_NAME = '/org/gnome/Shell/Screencast'
INTERFACE_NAME = BUS_NAME
PIPELINE='x264enc pass=qual quantizer=0 speed-preset=ultrafast ! queue ! matroskamux'

if path.isabs(argv[1]):
    name = argv[1]
else:
    name = path.join(getcwd(), argv[1])

bus = SessionBus()
screen_cast = bus.get_object(BUS_NAME, PATH_NAME)
screen_cast = Interface(screen_cast, INTERFACE_NAME)

ret, name = screen_cast.Screencast(name, {'pipeline': PIPELINE})

if not ret:
	print('Error starting screencast.')
	raise SystemExit(1)

try:
    i = input()
except (EOFError, KeyboardInterrupt):
    pass
finally:
    screen_cast.StopScreencast()

Great script! What file format does it output to?

Great script! What file format does it output to?

It's configured for H.264 Matroska (.mkv) files. It can be configured with the PIPELINE variable, in line 9.