@SirNuke Another option if you don’t want to source excluder mesh is to get some “backer rod” - a painter’s product sold as “caulk saver” at the home improvement palace. You use it to fill large gaps which you then seal over with caulk or silicone.
@SirNuke All of the comments saying spray foam are technically correct - that is the easiest way but it will look like orange crap. Some people mentioned steel wool - avoid that because it rusts and will end up looking like orange crap. Find some “excluder mesh”, which an inexpensive product sold to the pest control industry - it is a nylon mesh with reinforcing fibers…think Brillo pad stiffness. Stuff the gap to fill it then use silicone sealant to finish it off.
@Cqrd You are looking for https://www.makemkv.com
@Bluetreefrog
I, like you, code for myself not others and not professionally. Take a dive into Xcode and Swift if you’re in the Apple world. It is just stupid easy to throw together an app or tool in no time at all.