in gym_http_server.py [0:0]
def monitor_start(self, instance_id, directory, force, resume, video_callable):
env = self._lookup_env(instance_id)
if video_callable == False:
v_c = lambda count: False
else:
v_c = lambda count: count % video_callable == 0
self.envs[instance_id] = gym.wrappers.Monitor(env, directory, force=force, resume=resume, video_callable=v_c)