#!/usr/bin/env python3
import sys
import gi
gi.require_version('Gst', '1.0')
from gi.repository import Gst, GLib
from datetime import datetime

Gst.init(None)

device = sys.argv[1] if len(sys.argv) > 1 else "/dev/video0"
port = sys.argv[2] if len(sys.argv) > 2 else "5000"

pipeline = Gst.parse_launch(f"""
    v4l2src device={device} io-mode=2 !
    videoconvert !
    textoverlay name=overlay halignment=left valignment=top font-desc="Monospace 36" !
    x265enc tune=zerolatency speed-preset=ultrafast option-string="bframes=0:keyint=30:scenecut=0" !
    h265parse config-interval=1 !
    rtph265pay config-interval=1 mtu=1400 !
    udpsink host=127.0.0.1 port={port} sync=false async=false
""")

overlay = pipeline.get_by_name("overlay")

def update_text():
    overlay.set_property("text", datetime.now().strftime("%H:%M:%S.%f")[:-3])
    return True

GLib.timeout_add(5, update_text)

pipeline.set_state(Gst.State.PLAYING)
loop = GLib.MainLoop()
try:
    loop.run()
except KeyboardInterrupt:
    pipeline.set_state(Gst.State.NULL)