Is there a 64-bit app for working with image sequences to replace Quicktime 7?

I've been using Quicktime 7's "Movie to Image Sequence" and "Open Image Sequence" export and import options forever. It's useful for creating and working with time-lapses, modifying a single frame or a couple of frames in a video, creating short animated gifs, etc. Unfortunately Quicktime 7 is 32-bit, so once I upgrade to Catalina it will be gone forever. I'd like a recommendation for a 64-bit app with similar features: the ability to export every frame of a movie to a sequence of still images, and construct a new movie at a specified frame rate from a set of still images. Is there any good replacement for this Quicktime 7 feature? Free is optimal but not necessary.