ios - 无法使用类型为 'addMutableTrackWithMediaType' 的参数列表调用 '(mediaType: String, preferredTrackID: Int)'

Question

当我们尝试使用 AVMutableComposition 时，Xcode 抛出此错误:

Cannot invoke 'addMutableTrackWithMediaType' with an argument list of type  '(mediaType: String, preferredTrackID: Int)'

代码:

    let mixComposition = AVMutableComposition()
    let videoTrack = mixComposition.addMutableTrackWithMediaType(mediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)

我们也尝试过:

    let mixComposition = AVMutableComposition()
    let videoTrack = mixComposition.addMutableTrackWithMediaType(mediaType: "AVMediaTypeVideo", preferredTrackID: kCMPersistentTrackID_Invalid)

    let mixComposition = AVMutableComposition()
    let videoTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)

这些都不起作用，Google 也没有提供任何帮助。是什么导致了错误？

Answer 1

这更正了编译错误，尽管它为 preferredTrackId 使用了不同的值:

    var videoTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())