I have about 300 videos that I would like to permanently delete frames from the beginning and end, and preserve the original creation date. I currently just use the stock Photos app to view my videos. Photos has a "trim" feature but this doesn't permanently delete the frames, just hides them, so the videos much larger than I want. Ideally I would like to work in the Photos app, maybe use some sort of plugin/ extension, so that I can delete frames and still keep the original creation date and time. Any ideas?