Place the video you want in the video folder; it doesn't need to have a specific name.
Open the Python file (mp4py.py) and execute it.
During the execution, you can see the progress of the program in the console.
Be careful, any file in the image folder is going to be deleted.
After the Python script has been executed, new data will be written in the info.json file.
Open the SPWN file (mp4.spwn) and execute it.
During the execution, you can see the progress of the program in the console.
Open Geometry Dash.

Be aware that a longer MP4 file or a file with a high resolution will take more time to execute.

The Python script does not check if two consecutive frames have pixels of the same color in the same place.
To optimize the number of objects in the editor, each frame has been compressed by checking if two or more pixels can be represented with a single object.
Even with that, long videos with high resolution can cause lag in the game.