How to record simulation movies?

[miyukin73]

Hello,

I am new to Mujoco but I could take a screenshot by referring to your program! Thank you very much.

However, I did not know how to take a video and would like to know how to do so.

I am sorry to trouble you with this, but thank you in advance for your time.

Thank you in advance.

[rpapallas]

I don't think this is supported in this library currently. What I have been doing is to use an external tool that records my screen and just specify the MuJoCo window as the area to record. I know this can't be done asynchronously, but it's an option.

You could technically save multiple screenshots and bind them into a video (that's what a video is), but it will require some extra work on your part. But you could create a directory per video you want to record, save multiple screenshots (30fps for example) in there, then use ffmpeg to compile the pictures to a video. All this can be done in a bash script or even in Python if you wanted to:

1. Save screenshots to dir
2. Use subprocess.Popen to execute the ffmpeg command to compile to video.
3. Delete the screenshots after the video is being created.

[saneeeee]

You can collect frames to an array with offscreen rendering and produce a video from the array using cv2.