i know a little bit about this. movies do hire [foley artists](https://en.wikipedia.org/wiki/Foley_(filmmaking)) to record original sound effects for their films, but simply using stock sound effects is a lot cheaper and a lot faster. it’s usually a combination of both. if you need the sound of a police siren or a dog barking, you are going to just use something from the library rather than record something new and original.
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