Cannot find installation of real FFmpeg during offline rendering

[vikashplus]

Details

• Offline rendering goes well but crashes at the end with FFMPEG error
• Likely an issues with conda env
• Likely an issue on mac. I remember successfully working with it on linux.

Code

(mjrl-env) ~/Libraries/mj_envs/mj_envs$ python utils/visualize_env.py -e FrankaReachFixed-v0 -r offscreen
RS:> Registering Biomechanics Envs
RS:> Registering Hand Envs
Episode 0: rendering offline Creating offscreen glfw
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, Traceback (most recent call last):
  File "utils/visualize_env.py", line 64, in <module>
    main()
  File "/Users/vikashplus/.conda/envs/mjrl-env/lib/python3.7/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/Users/vikashplus/.conda/envs/mjrl-env/lib/python3.7/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/Users/vikashplus/.conda/envs/mjrl-env/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/vikashplus/.conda/envs/mjrl-env/lib/python3.7/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "utils/visualize_env.py", line 61, in main
    filename=filename)
  File "/Users/vikashplus/Libraries/mj_envs/mj_envs/envs/env_base.py", line 419, in visualize_policy_offscreen
    skvideo.io.vwrite( file_name, np.asarray(arrs))
  File "/Users/vikashplus/.conda/envs/mjrl-env/lib/python3.7/site-packages/skvideo/io/io.py", line 60, in vwrite
    assert _HAS_FFMPEG, "Cannot find installation of real FFmpeg (which comes with ffprobe)."
AssertionError: Cannot find installation of real FFmpeg (which comes with ffprobe).

[Vittorio-Caggiano]

as suggested here when using conda package manager conda install -c mrinaljain17 ffmpeg

[vikashplus]

@girifb -- lets keep a note of this when we revisit the install instructions

[anilsh]

I don't see any option for offscreen rendering in visutalize_env.py . Am I missing something?

mj_envs/mj_envs$ python utils/visualize_env.py -e FrankaReachFixed-v0 -r offscreen

[vikashplus]

@anilsh -- please see here for an example for offline rendering https://github.com/vikashplus/robohive/blob/main/robohive/utils/examine_env.py