ios - AVFoundation 视频播放问题
<p><p>我跟着 <a href="https://www.youtube.com/watch?v=3FKzSYAGfJ0" rel="noreferrer noopener nofollow">this excellent tutorial</a>来自 Yuma 并且有一些工作。下面是我在 ViewController 中使用的代码</p>
<pre><code>import UIKit
import SceneKit
import ARKit
import AVFoundation
import SpriteKit
class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
override func viewDidLoad() {
super.viewDidLoad()
// Set the view's delegate
sceneView.delegate = self
// Show statistics such as fps and timing information
sceneView.showsStatistics = true
// Create a new scene
let scene = SCNScene(named: "art.scnassets/notebook.scn")!
// Set the scene to the view
sceneView.scene = scene
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration
let configuration = ARImageTrackingConfiguration()
guard let arImages = ARReferenceImage.referenceImages(inGroupNamed: "AR Resources", bundle: nil) else { return }
configuration.trackingImages = arImages
// Run the view's session
sceneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Pause the view's session
sceneView.session.pause()
}
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
guard anchor is ARImageAnchor else { return }
// Amy Image recognition
guard let amyContainer = sceneView.scene.rootNode.childNode(withName: "amy", recursively: false) else { return }
amyContainer.removeFromParentNode()
node.addChildNode(amyContainer)
amyContainer.isHidden = false
// Video
let videoURL = Bundle.main.url(forResource: "video", withExtension: "mp4")!
let videoPlayer = AVPlayer(url: videoURL)
let videoScene = SKScene(size: CGSize(width: 900.0, height: 1400.0))
let videoNode = SKVideoNode(avPlayer: videoPlayer)
videoNode.position = CGPoint(x: videoScene.size.width / 2, y: videoScene.size.height / 2)
videoNode.size = videoScene.size
videoNode.yScale = -1
videoNode.play()
videoScene.addChild(videoNode)
guard let video = amyContainer.childNode(withName: "video", recursively: true)
else { return }
video.geometry?.firstMaterial?.diffuse.contents = videoScene
}
}
</code></pre>
<p>当我使用作为教程一部分提供的视频时，一切正常，但当我尝试包含我创建的视频时，我只会在目标图像上看到一个白框，但没有视频。</p>
<p>我已经检查了三倍的名称，我尝试导出具有完全相同尺寸的视频，但都没有成功。我已经测试过上传一个新版本的视频，它确实可以作为不同的文件名工作，并且更改了名称并且它可以工作，所以我必须假设这是我正在制作的 .mp4 的问题。</p>
<p>对于这种方法，mp4 是否需要特定的规则/设置，我可以使用 Premiere Pro 或 Handbrake 中的设置吗？或者如何调试通过 Xcode 本身发生的任何内部错误？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>可能是因为您的视频很大。在尝试播放视频之前，您需要先等待 <strong>AVPlayer</strong> 准备就绪</p>
<pre><code>class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
var observer: NSKeyValueObservation?
var videoNode: SKVideoNode?
override func viewDidLoad() {
super.viewDidLoad()
// Set the view's delegate
sceneView.delegate = self
// Show statistics such as fps and timing information
sceneView.showsStatistics = true
// Create a new scene
let scene = SCNScene(named: "art.scnassets/notebook.scn")!
// Set the scene to the view
sceneView.scene = scene
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration
let configuration = ARImageTrackingConfiguration()
guard let arImages = ARReferenceImage.referenceImages(inGroupNamed: "AR Resources", bundle: nil) else { return }
configuration.trackingImages = arImages
// Run the view's session
sceneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Pause the view's session
sceneView.session.pause()
}
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
guard anchor is ARImageAnchor else { return }
// Amy Image recognition
guard let amyContainer = sceneView.scene.rootNode.childNode(withName: "amy", recursively: false) else { return }
amyContainer.removeFromParentNode()
node.addChildNode(amyContainer)
amyContainer.isHidden = false
let videoPlayer = self.createAVPlayer()
let videoScene = SKScene(size: CGSize(width: 900.0, height: 1400.0))
self.videoNode = SKVideoNode(avPlayer: videoPlayer)
self.videoNode?.position = CGPoint(x: videoScene.size.width / 2, y: videoScene.size.height / 2)
self.videoNode?.size = videoScene.size
self.videoNode?.yScale = -1
videoScene.addChild(self.videoNode!)
guard let video = amyContainer.childNode(withName: "video", recursively: true)
else { return }
video.geometry?.firstMaterial?.diffuse.contents = videoScene
}
func createAVPlayer() -> AVPlayer {
let videoURL = Bundle.main.url(forResource: "video", withExtension: "mp4")!
let asset = AVAsset(url: videoURL)
let assetKeys = [
"playable",
"hasProtectedContent"
]
let playerItem = AVPlayerItem(asset: asset,
automaticallyLoadedAssetKeys: assetKeys)
self.observer = playerItem.observe(\.status, options:[.new, .old], changeHandler: { (playerItem, change) in
if playerItem.status == .readyToPlay {
self.videoNode?.play() // Only play when Its ready
}
})
return AVPlayer(playerItem: playerItem)
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - AVFoundation 视频播放问题，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/55301481/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/55301481/
</a>
</p>
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