AVFoundation documentation/API's have absolutely nothing to do with the maturity of Swift's API. So much of Apple's internal API is still written in Objective-C

AVFoundation documentation/API's have absolutely nothing to do with the maturity of Swift's API. So much of Apple's internal API is still written in Objective-C (a problem and discussion for a different thread). But for your exact problem here: Check out the "Getting Supported Media Types" section. https://developer.apple.com/documentation/avfoundation/avurlasset https://developer.apple.com/documentation/avfoundation/avurl...