Fix video recording.

[mahiuchun]

Tested with python examples/agents/random_agent.py. The code before the change would create empty video files.

[khazit]

Thank you ! Fixes it for me too, tested with this :

import gym
env = gym.make('CartPole-v0')
env = gym.wrappers.Monitor(env, "recording", force=True)
env.reset()
while True:
    obs, rew, done, info = env.step(env.action_space.sample())
    if done:
        break

[feiden]

I stumbled on this problem by chance, and almost submitted the exact same bug fix. Approve!

[CrazyNicolas]

I already fix the code but still have same problem(262bytes), can I ask why?

[CrazyNicolas]

I already fix the code but still have same problem(262bytes), can I ask why?

Oh! I see, if you change the code, you need reboot your PC to activate the change. I reboot and succeed!

[manuel-delverme]

Why is this not released yet?