Paint.net is decent for basic editing, but for something like ripping sprites, you might want a bit more functionality. GIMP is a solid free option, it offers more advanced tools for extracting and cleaning up sprites. Krita is another great choice, especially for detailed image work and sprite editing. Both have a good balance of features and are free to use.
If you need to convert the video frames into different image formats or batch process them, this tool might help: https://www.movavi.com/image-converter/. Good luck with your project—sounds like a fun idea for a fan game!
If you need to convert the video frames into different image formats or batch process them, this tool might help: https://www.movavi.com/image-converter/. Good luck with your project—sounds like a fun idea for a fan game!