[Question] RecordVideo funtion not saving any videos

[eak0mo]

Question

when using the following syntax test_env=record_video.RecordVideo(gym.make("BipedalWalker-v3",render_mode="rgb_array"),video_folder="",name_prefix="")

for the RecordVideo function, there is a video file created that is immediately deleted and produces these warnings.

[younik]

Regarding the first warning, you should specify a non-existing folder to get rid of it

The second one is tricky; it happens when the agent runs backward from the start

[pseudo-rnd-thoughts]

@younik I don't seem to be able to replicate the issue

env = gym.make("BipedalWalker-v3",render_mode="rgb_array")
for _ in range(10):
    env.reset()

    for _ in range(20):
        render = env.render()
        assert render.shape == (400, 600, 3), render.shape
        env.step(env.action_space.sample())

env.close()

Weirdly I found that the render image was (400, 600, 3) not (400, 620, 3)

I couldn't find the warning raised by any other env

for spec in gym.envs.registry.values():
    env = spec.make(render_mode="rgb_array")
    env = gym.wrappers.RecordVideo(env, video_folder="video", name_prefix=spec.id)

    env.reset()
    env.step(env.action_space.sample())
    env.close()