使用AVFoundation AVPlayer循环播放视频？

在AVFoundation中是否有相对简单的循环视频的方法？

我已经如下创建了我的AVPlayer和AVPlayerLayer：

avPlayer = [[AVPlayer playerWithURL:videoUrl] retain];
avPlayerLayer = [[AVPlayerLayer playerLayerWithPlayer:avPlayer] retain];

avPlayerLayer.frame = contentView.layer.bounds;
[contentView.layer addSublayer: avPlayerLayer];

然后播放以下视频：

[avPlayer play];

视频播放正常，但在最后停止。使用MPMoviePlayerController，您所要做的就是将其repeatMode属性设置为正确的值。在AVPlayer上似乎没有类似的属性。似乎也没有回调可以告诉我电影何时结束，因此我可以寻找开始并再次播放。

我没有使用MPMoviePlayerController，因为它有一些严重的限制。我希望能够一次播放多个视频流。

播放器结束时，您会收到通知。检查一下AVPlayerItemDidPlayToEndTimeNotification

设置播放器时：

对象

  avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone; 

  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(playerItemDidReachEnd:)
                                               name:AVPlayerItemDidPlayToEndTimeNotification
                                             object:[avPlayer currentItem]];

这样可以防止播放器在结尾处暂停。

在通知中：

- (void)playerItemDidReachEnd:(NSNotification *)notification {
    AVPlayerItem *p = [notification object];
    [p seekToTime:kCMTimeZero];
}

这将倒带电影。

释放播放器时，请不要忘记取消注销通知。

迅速

avPlayer?.actionAtItemEnd = .none

NotificationCenter.default.addObserver(self,
                                       selector: #selector(playerItemDidReachEnd(notification:)),
                                       name: .AVPlayerItemDidPlayToEndTime,
                                       object: avPlayer?.currentItem)

@objc func playerItemDidReachEnd(notification: Notification) {
    if let playerItem = notification.object as? AVPlayerItem {
        playerItem.seek(to: kCMTimeZero)
    }
}

迅捷4+

@objc func playerItemDidReachEnd(notification: Notification) {
    if let playerItem = notification.object as? AVPlayerItem {
        playerItem.seek(to: CMTime.zero, completionHandler: nil)
    }
}

如果有帮助，在iOS / tvOS 10中，可以使用新的AVPlayerLooper（）来创建视频的无缝循环（Swift）：

player = AVQueuePlayer()
playerLayer = AVPlayerLayer(player: player)
playerItem = AVPlayerItem(url: videoURL)
playerLooper = AVPlayerLooper(player: player, templateItem: playerItem)
player.play()    

这是在WWDC 2016的“ AVFoundation回放的进展”中提出的：https： //developer.apple.com/videos/play/wwdc2016/503/

即使使用此代码，在我向Apple提交错误报告并得到以下答复之前，我也一直感到疲倦：

问题是电影持续时间长于音频/视频轨道的电影文件。FigPlayer_File禁用无缝过渡，因为音轨编辑比电影持续时间短（15.682 vs 15.787）。

您需要修复电影文件以使电影时长和音轨时长相同，或者可以使用AVPlayerLooper的时间范围参数（将时间范围设置为0到音轨的时长）

事实证明，Premiere一直在导出音轨长度与视频长度稍有不同的文件。就我而言，可以完全删除音频，这可以解决问题。

在Swift中：

播放器结束时，您可以收到通知...检查AVPlayerItemDidPlayToEndTimeNotification

设置播放器时：

avPlayer.actionAtItemEnd = AVPlayerActionAtItemEnd.None

NSNotificationCenter.defaultCenter().addObserver(self, 
                                                 selector: "playerItemDidReachEnd:", 
                                                 name: AVPlayerItemDidPlayToEndTimeNotification, 
                                                 object: avPlayer.currentItem)

这样可以防止播放器在结尾处暂停。

在通知中：

func playerItemDidReachEnd(notification: NSNotification) {
    if let playerItem: AVPlayerItem = notification.object as? AVPlayerItem {
        playerItem.seekToTime(kCMTimeZero)
    }
}

迅捷3

NotificationCenter.default.addObserver(self,
    selector: #selector(PlaylistViewController.playerItemDidReachEnd),
     name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
     object: avPlayer?.currentItem)

这将倒带电影。

释放播放器时，请不要忘记注销通知。

为了防止停顿打issue，我最终要做的是：

迅速：

NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime,
                                       object: nil,
                                       queue: nil) { [weak self] note in
                                        self?.avPlayer.seek(to: kCMTimeZero)
                                        self?.avPlayer.play()
}

目标C：

__weak typeof(self) weakSelf = self; // prevent memory cycle
NSNotificationCenter *noteCenter = [NSNotificationCenter defaultCenter];
[noteCenter addObserverForName:AVPlayerItemDidPlayToEndTimeNotification
                        object:nil
                         queue:nil
                    usingBlock:^(NSNotification *note) {
                        [weakSelf.avPlayer seekToTime:kCMTimeZero];
                        [weakSelf.avPlayer play];
                    }];

注意：我没有使用，avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone因为它不需要。

我建议使用AVQueuePlayer无缝播放视频。添加通知观察者

AVPlayerItemDidPlayToEndTimeNotification

然后在其选择器中循环播放视频

AVPlayerItem *video = [[AVPlayerItem alloc] initWithURL:videoURL];
[self.player insertItem:video afterItem:nil];
[self.player play];

为了避免倒带视频时出现间隙，在合成中使用同一资产的多个副本对我来说效果很好。我在这里找到它：www.developers-life.com/avplayer-looping-video-without-hiccupdelays.html（链接现在已消失）。

AVURLAsset *tAsset = [AVURLAsset assetWithURL:tURL];
CMTimeRange tEditRange = CMTimeRangeMake(CMTimeMake(0, 1), CMTimeMake(tAsset.duration.value, tAsset.duration.timescale));
AVMutableComposition *tComposition = [[[AVMutableComposition alloc] init] autorelease];
for (int i = 0; i < 100; i++) { // Insert some copies.
    [tComposition insertTimeRange:tEditRange ofAsset:tAsset atTime:tComposition.duration error:nil];
}
AVPlayerItem *tAVPlayerItem = [[AVPlayerItem alloc] initWithAsset:tComposition];
AVPlayer *tAVPlayer = [[AVPlayer alloc] initWithPlayerItem:tAVPlayerItem];

这对我来说没有任何打issues的问题，关键是在调用seekToTime方法之前暂停播放器：

1. 初始化AVPlayer

   let url = NSBundle.mainBundle().URLForResource("loop", withExtension: "mp4")
   let playerItem = AVPlayerItem(URL: url!)
   
   self.backgroundPlayer = AVPlayer(playerItem: playerItem)
   let playerLayer = AVPlayerLayer(player: self.backgroundPlayer)
   
   playerLayer.frame = CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height)
   self.layer.addSublayer(playerLayer)
   self.backgroundPlayer!.actionAtItemEnd = .None
   self.backgroundPlayer!.play()

2. 注册通知

   NSNotificationCenter.defaultCenter().addObserver(self, selector: "videoLoop", name: AVPlayerItemDidPlayToEndTimeNotification, object: self.backgroundPlayer!.currentItem)

3. videoLoop功能

   func videoLoop() {
     self.backgroundPlayer?.pause()
     self.backgroundPlayer?.currentItem?.seekToTime(kCMTimeZero)
     self.backgroundPlayer?.play()
   }

对于Swift 3和4

NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime, object: self.avPlayer?.currentItem, queue: .main) { _ in
     self.avPlayer?.seek(to: kCMTimeZero)
     self.avPlayer?.play()
}

我在Objective-c和AVQueuePlayer中的解决方案-看来您必须复制AVPlayerItem，并且在完成第一个元素的播放后立即添加另一个副本。“种类”很有道理，对我毫无障碍

NSURL *videoLoopUrl; 
// as [[NSBundle mainBundle] URLForResource:@"assets/yourVideo" withExtension:@"mp4"]];
AVQueuePlayer *_loopVideoPlayer;

+(void) nextVideoInstance:(NSNotification*)notif
{
 AVPlayerItem *currItem = [AVPlayerItem playerItemWithURL: videoLoopUrl];

[[NSNotificationCenter defaultCenter] addObserver:self
                                      selector:@selector(nextVideoInstance:)
                                      name:AVPlayerItemDidPlayToEndTimeNotification
                                      object: currItem];

 [_loopVideoPlayer insertItem:currItem afterItem:nil];
 [_loopVideoPlayer advanceToNextItem];

}

+(void) initVideoPlayer {
 videoCopy1 = [AVPlayerItem playerItemWithURL: videoLoopUrl];
 videoCopy2 = [AVPlayerItem playerItemWithURL: videoLoopUrl];
 NSArray <AVPlayerItem *> *dummyArray = [NSArray arrayWithObjects: videoCopy1, videoCopy2, nil];
 _loopVideoPlayer = [AVQueuePlayer queuePlayerWithItems: dummyArray];

 [[NSNotificationCenter defaultCenter] addObserver: self
                                      selector: @selector(nextVideoInstance:)
                                      name: AVPlayerItemDidPlayToEndTimeNotification
                                      object: videoCopy1];

 [[NSNotificationCenter defaultCenter] addObserver: self
                                      selector: @selector(nextVideoInstance:)
                                      name: AVPlayerItemDidPlayToEndTimeNotification
                                      object: videoCopy2];
}

https://gist.github.com/neonm3/06c3b5c911fdd3ca7c7800dccf7202ad

斯威夫特5：

我对以前的答案做了一些细微的调整，例如将playerItem添加到队列，然后再将其添加到playerLayer。

let playerItem = AVPlayerItem(url: url)
let player = AVQueuePlayer(playerItem: playerItem)
let playerLayer = AVPlayerLayer(player: player)

playerLooper = AVPlayerLooper(player: player, templateItem: playerItem)

playerLayer.frame = cell.eventImage.bounds
playerLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill

// Add the playerLayer to a UIView.layer

player.play()

并将playerLooper设置为UIViewController的属性，否则视频只能播放一次。

将视频加载到AVPlayer后（当然，通过其AVPlayerItem）：

 [self addDidPlayToEndTimeNotificationForPlayerItem:item];

addDidPlayToEndTimeNotificationForPlayerItem方法：

- (void)addDidPlayToEndTimeNotificationForPlayerItem:(AVPlayerItem *)item
{
    if (_notificationToken)
        _notificationToken = nil;

    /*
     Setting actionAtItemEnd to None prevents the movie from getting paused at item end. A very simplistic, and not gapless, looped playback.
     */
    _player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
    _notificationToken = [[NSNotificationCenter defaultCenter] addObserverForName:AVPlayerItemDidPlayToEndTimeNotification object:item queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
        // Simple item playback rewind.
        [[_player currentItem] seekToTime:kCMTimeZero];
    }];
}

在您的viewWillDisappear方法中：

if (_notificationToken) {
        [[NSNotificationCenter defaultCenter] removeObserver:_notificationToken name:AVPlayerItemDidPlayToEndTimeNotification object:_player.currentItem];
        _notificationToken = nil;
    }

在实现文件中视图控制器的接口声明中：

id _notificationToken;

在尝试之前是否需要查看此运行情况？下载并运行此示例应用程序：

https://developer.apple.com/library/prerelease/ios/samplecode/AVBasicVideoOutput/Listings/AVBasicVideoOutput_APLViewController_m.html#//apple_ref/doc/uid/DTS40013109-AVBasicVideoOutput_APLViewController_m-DontLinkElementID_8

在使用此代码的应用中，在视频结尾和开头之间没有任何暂停。实际上，根据时间的不同，除了时间码显示之外，我无法告诉视频还是重新开始。

您可以添加AVPlayerItemDidPlayToEndTimeNotification观察者并从选择器中的开始重播视频，如下所示

 //add observer
[[NSNotificationCenter defaultCenter] addObserver:self                                                 selector:@selector(playbackFinished:)                                                     name:AVPlayerItemDidPlayToEndTimeNotification
object:_aniPlayer.currentItem];

-(void)playbackFinished:(NSNotification *)notification{
    [_aniPlayer seekToTime:CMTimeMake(0, 1)];//replay from start
    [_aniPlayer play];
}

以下是在Swift 4.1中的WKWebView中为我工作的WKwebviewConfiguration中WKWebView的主要部分

wkwebView.navigationDelegate = self
wkwebView.allowsBackForwardNavigationGestures = true
self.wkwebView =  WKWebView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height))
let config = WKWebViewConfiguration()
config.allowsInlineMediaPlayback = true
wkwebView = WKWebView(frame: wkwebView.frame, configuration: config)
self.view.addSubview(wkwebView)
self.wkwebView.load(NSURLRequest(url: URL(string: self.getUrl())!) as URLRequest)

我要做的是使其循环播放，如下面的代码所示：

[player addPeriodicTimeObserverForInterval:CMTimeMake(1.0, 1.0)
queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
    float current = CMTimeGetSeconds(time);
    float total = CMTimeGetSeconds([playerItem duration]);
    if (current >= total) {
        [[self.player currentItem] seekToTime:kCMTimeZero];
        [self.player play];
    }
}];

Xcode 10.1中的Swift 4.2

是的，有一种相对简单的方法可以在AVKit/中AVFoundation使用视频AVQueuePlayer()，键值观察（KVO）技术及其令牌来循环播放视频。

这绝对适用于一堆H.264 / HEVC视频，而CPU负担最小。

这是一个代码：

import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController {

    private let player = AVQueuePlayer()
    let clips = ["01", "02", "03", "04", "05", "06", "07"]
    private var token: NSKeyValueObservation?
    var avPlayerView = AVPlayerViewController()

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(true)

        self.addAllVideosToPlayer()
        present(avPlayerView, animated: true, completion: { self.player.play() })
    }

    func addAllVideosToPlayer() {
        avPlayerView.player = player

        for clip in clips {
            let urlPath = Bundle.main.path(forResource: clip, ofType: "m4v")!
            let url = URL(fileURLWithPath: urlPath)
            let playerItem = AVPlayerItem(url: url)
            player.insert(playerItem, after: player.items().last)

            token = player.observe(\.currentItem) { [weak self] player, _ in
                if self!.player.items().count == 1 { self?.addAllVideosToPlayer() }
            }
        }
    }
}

在代码下方使用AVPlayerViewController，对我有用

        let type : String! = "mp4"
        let targetURL : String? = NSBundle.mainBundle().pathForResource("Official Apple MacBook Air Video   YouTube", ofType: "mp4")

        let videoURL = NSURL(fileURLWithPath:targetURL!)


        let player = AVPlayer(URL: videoURL)
        let playerController = AVPlayerViewController()

        playerController.player = player
        self.addChildViewController(playerController)
        self.playView.addSubview(playerController.view)
        playerController.view.frame = playView.bounds

        player.play()

所有控件都将显示，希望对您有所帮助

/* "numberOfLoops" is the number of times that the sound will return to the beginning upon reaching the end. 
A value of zero means to play the sound just once.
A value of one will result in playing the sound twice, and so on..
Any negative number will loop indefinitely until stopped.
*/
@property NSInteger numberOfLoops;

此属性已在内部定义AVAudioPlayer。希望这可以帮到你。我正在使用Xcode 6.3。