AVplayer加载但不播放.m3u8文件

Question

AVplayer可以很好地加载，但只能加载图像...它不会开始播放或崩溃，甚至不会出错。有什么线索吗？

struct live: View {
@Environment(\.presentationMode) private var presentationMode

var btnBack : some View { Button(action: {
    self.presentationMode.wrappedValue.dismiss()
    }) {
        HStack {
        Image("Home") // set image here
            .aspectRatio(contentMode: .fit)
            .foregroundColor(.white)
        }
    }
}

let player = AVPlayer(url: URL(string: "https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_4x3/bipbop_4x3_variant.m3u8")!)

var body: some View {
    
    VideoPlayer(player: player)
        
    .navigationBarTitle("", displayMode: .inline)
    .navigationBarBackButtonHidden(true)
            .navigationBarItems(leading: btnBack)
}
}



struct live_Previews: PreviewProvider {
static var previews: some View {

    live()
    
    }
}