在SceneKit中使用MPMoviePlayerController作为纹理

Question

我在scenekit中创建了一个多维数据集,并尝试使用MPMoviePlayerController的实例作为其材质.它很有用,但效果不是很好:视频看起来很跳跃,就好像它会在视频帧之间跳跃(基本上是从开始到最后一点播放的帧重放).声音还可以.

我对正在发生的事情做了一个简短的屏幕截图,我想这很明显来自视频:Youtube视频

这是处理映射到多维数据集和创建播放器的代码:

var moviePlayer: MPMoviePlayerController?

func startPlayingVideo(){
    let mainBundle = NSBundle.mainBundle()
    let url = mainBundle.URLForResource("Sample", withExtension: "m4v")
    moviePlayer = MPMoviePlayerController(contentURL: url)

    if let player = moviePlayer{
        /* Listen for the notification that the movie player sends us whenever it finishes playing */
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "videoHasFinishedPlaying:", name: MPMoviePlayerPlaybackDidFinishNotification, object: nil)
        println("Successfully instantiated the movie player")
        player.scalingMode = .AspectFit

        var materials = [SCNMaterial]()
        for i in 1...6 {
            let material = SCNMaterial()
            material.diffuse.contents = player.view.layer
            player.view.frame = CGRectMake(0, 0, 200, 200)
            materials.append(material)
        }
        boxGeometry.materials = materials

        player.controlStyle = MPMovieControlStyle.None
        player.play()
    }
    else {
        println("Failed to instantiate the movie player")
    }
}

任何想法如何解决这个帧跳跃及其发生的原因？非常感谢

Answer 1

我开了一个关于AVPlayerLayer 的雷达不能用作SceneKit纹理(在设备上......在模拟器上工作!).Apple很友好地回答称这是按预期工作的,并提供了另一种选择:

AVPlayerLayer在设备上呈现为进程外,不能用作纹理.请改为使用SKVideoNode.