Record h264 timestamped video in Python with PiCamera

video.py

from picamera import PiCamera, Color
from time import sleep
import datetime as dt

camera = PiCamera()
camera.annotate_background = Color("black")
start = dt.datetime.now()

camera.start_recording("recording.h264")
while (dt.datetime.now() - start).seconds < 3600: # total seconds for length of recording
  camera.annotate_text = dt.datetime.now().strftime("%m-%d-%Y %H:%M:%S")
  camera.wait_recording(0.2)
camera.stop_recording()
camera.close()