record a video

[zhixiongzh]

• [x] I have marked all applicable categories:
  • [ ] exception-raising bug
  • [ ] RL algorithm bug
  • [ ] system worker bug
  • [ ] system utils bug
  • [ ] code design/refactor
  • [x] documentation request
  • [ ] new feature request
• [x] I have visited the readme and doc
• [x] I have searched through the issue tracker and pr tracker
• [x] I have mentioned version numbers, operating system and environment, where applicable:

  import ding, torch, sys
  print(ding.__version__, torch.__version__, sys.version, sys.platform)
  v0.4.9 1.12.0 3.8.13 (default, Mar 28 2022, 11:38:47) 
  [GCC 7.5.0] linux

I follow the tutorial to record a video using the following code

from easydict import EasyDict
from dizoo.mujoco.envs import MujocoEnv
env = MujocoEnv(EasyDict({'env_id': 'Hoopper-v3' }))
env.enable_save_replay(replay_path='./video')
obs = env.reset()
while True:
    action = env.random_action()
    timestep = env.step(action)
    if timestep.done:
        print('Episode is over, eval episode return is: {}'.format(timestep.info['eval_episode_return']))
        break

but met the error below

Traceback (most recent call last):
  File "store_video_mujoco.py", line 20, in <module>
    env = MujocoEnv(EasyDict({'env_id': 'Hoopper-v3' }))
  File "/home/myuser/.conda/envs/si_mujoco/lib/python3.8/site-packages/dizoo/mujoco/envs/mujoco_env.py", line 37, in __init__
    self._action_clip = cfg.action_clip
AttributeError: 'EasyDict' object has no attribute 'action_clip'

so I modify the code such that

config = MujocoEnv.default_config()
config.env_id="Hopper-v3"
env = MujocoEnv(config)
env.enable_save_replay(replay_path='./video')
obs = env.reset()
while True:
    action = env.random_action()
    timestep = env.step(action)
    if timestep.done:
        print('Episode is over, eval episode return is: {}'.format(timestep.info['eval_episode_return']))
        break

there is still an error

Unknown encoder 'libx264'
ERROR: VideoRecorder encoder failed: None
ERROR: VideoRecorder encoder failed: None
ERROR: VideoRecorder encoder failed: None
ERROR: VideoRecorder encoder failed: None
ERROR: VideoRecorder encoder exited with status 1
Episode is over, eval episode return is: 15.903695570099208

Could I ask how to fix this?

[zhixiongzh]

I solve this by removing the ffmpeg packge from conda environment, refer to this

[zjowowen]

Hi, thanks for your information. We will fix the errors in the document soon.

For installing rendering related dependencies, please use 'pip install -e .[common_env,video]'. For installing OpenGL related dependencies, please refer to installation guide in dockerfile https://github.com/opendilab/DI-engine/blob/main/docker/Dockerfile.env#L14.