a setback in custom editing work

[Mars123xxx]

i follow your Readme.md guidance,upload my own custom video under the demo folder,and then run the script edit_image.py to get first edited frame,some wrong occurs showing

../demo/my_video/0000.jpg is not a valid path

when i try to start ddim inversion process. could you tell me how to convert video to frames? or which script is useful i didn't remind before.