IINA 'iina://' example.

iinaTest.swift

import Cocoa

var urlQueryValueAllowed: CharacterSet = {
    let generalDelimitersToEncode = ":#[]@?/" // does not include "?" or "/" due to RFC 3986 - Section 3.4
    let subDelimitersToEncode = "!$&'()*+,;="
    
    var allowed = CharacterSet.urlQueryAllowed
    allowed.remove(charactersIn: generalDelimitersToEncode + subDelimitersToEncode)
    
    return allowed
}()

let videoUrl = "/test/test.webm".addingPercentEncoding(withAllowedCharacters: urlQueryValueAllowed)!
let audioUrl = "/test/test.m4a".addingPercentEncoding(withAllowedCharacters: urlQueryValueAllowed)!
let iinaUrl = "iina://open?url=\(videoUrl)&mpv_audio-file=\(audioUrl)"
print(iinaUrl)