[Bug Report] Rendering problem after first truncation if env is wrapped with RecordVideo

[ozhanozen]

Describe the bug

If I wrap the environment with RecordVideo wrapper when using rgb_array/rgb_array_list as the render_mode, env.render() returns arrays with zero values after the first time the environment is truncated. Reseting the environment does not fix the rendering output. This does not happen when not using the RecordVideo wrapper on Gymnasium-Robotics environments, or when using RecordVideo wrapper on the basic Gymnasium environments (e.g., classic control).

Code example

import gymnasium as gym
from gymnasium.wrappers import RecordVideo

env = gym.make("HandReach-v1", render_mode="rgb_array",max_episode_steps=5)
env = RecordVideo(env, video_folder="videos/",disable_logger=True)

observation, info = env.reset()
for i in range(7):
    action = env.action_space.sample() 
    observation, reward, terminated, truncated, info = env.step(action)

    if terminated or truncated:
        observation, info = env.reset()
        print("reset")
    else:
        out = env.render()
        print(out.max())

env.close()

System Info

• macOS 13.1
• python 3.10.8
• gymnasium 0.27.0 (pypi)
• gymnasium-robotics 1.2.0 (pypi)
• moviepy 1.0.3 (pypi)
• ffmpeg-python 0.2.0 (pypi)

Additional context

Checklist

• I have checked that there is no similar issue in the repo (required)

[rodrigodelazcano]

Thanks for raising this issue. We are aware of it and it will be solved in the next Gymnasium release.
There will be a new version of the record wrapper Farama-Foundation/Gymnasium#246.

If you want to test it you can install Gymansium from source

[ozhanozen]

Thanks!