[RLlib] rollout.py; make video-recording options more intuitive and add warnings/errors (issue 7121). (#7347)
[RLlib] rollout.py; make video-recording options more intuitive and add warnings/errors (issue 7121). (#7347)


richardliaw/ray,pcmoritz/ray-1,richardliaw/ray,pcmoritz/ray-1,robertnishihara/ray,robertnishihara/ray,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray,robertnishihara/ray,richardliaw/ray,robertnishihara/ray,ray-project/ray,robertnishihara/ray,richardliaw/ray,ray-project/ray,richardliaw/ray,ray-project/ray,ray-project/ray,robertnishihara/ray,ray-project/ray,robertnishihara/ray,robertnishihara/ray,richardliaw/ray,pcmoritz/ray-1,ray-project/ray,robertnishihara/ray,richardliaw/ray,ray-project/ray,pcmoritz/ray-1,richardliaw/ray,pcmoritz/ray-1,pcmoritz/ray-1