用AVFoundation AVPlayer循环播放视频？-Java 学习之路

128

在AVFoundation中有一种相对简单的循环视频方式吗？

我已经创建了我的AVPlayer和AVPlayerLayer：

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

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

然后我播放我的视频：

[avPlayer play];

视频播放正常但最后停止播放 . 使用MPMoviePlayerController，您只需将其 repeatMode 属性设置为正确的值即可 . 没有't appear to be a similar property on AVPlayer. There also doesn'似乎是一个回调，它将告诉我电影什么时候结束，所以我可以寻找开头并重新播放 .

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 .

16 回答

玩家结束时可以获得通知 . 检查 AVPlayerItemDidPlayToEndTimeNotification

设置播放器时：

ObjC

avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone; 

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

这样可以防止玩家在结束时暂停 .

在通知中：

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

这将回放电影 .

不要忘记在释放播放器时取消注册通知 .

Swift

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

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

回复于 2024-04-24T03:49:22+08:00

-2
如果它有帮助，在iOS / tvOS 10中，有一个新的AVPlayerLooper（）可用于创建无缝的视频循环（Swift）：
```
player = AVQueuePlayer()
playerLayer = AVPlayerLayer(player: player)
playerItem = AVPlayerItem(url: videoURL)
playerLooper = AVPlayerLooper(player: player, templateItem: playerItem)
player.play()
```
这是在2016年WWDC上展示的"Advances in AVFoundation Playback"：https://developer.apple.com/videos/play/wwdc2016/503/

即使使用这段代码，在我向Apple提交错误报告并获得此回复之前，我还是有一个打嗝：

电影持续时间长于音频/视频轨道的电影文件是问题所在 . FigPlayer_File正在禁用无间隙转换，因为音轨编辑比电影持续时间短（15.682 vs 15.787） . 您需要修复影片文件以使影片持续时间和轨道持续时间长度相同，或者您可以使用AVPlayerLooper的时间范围参数（设置时间范围从0到音轨的持续时间）

事实证明，Premiere一直在导出文件的音轨长度与视频略有不同 . 在我的情况下，完全删除音频是好的，这解决了问题 .
回复于 2024-04-24T03:49:22+08:00

在 Swift ：

您可以在玩家结束时获得通知...检查AVPlayerItemDidPlayToEndTimeNotification

设置播放器时：

avPlayer.actionAtItemEnd = AVPlayerActionAtItemEnd.None

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

这样可以防止玩家在结束时暂停 .

在通知中：

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

Swift3

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

这将回放电影 .

不要忘记在释放播放器时取消注册通知 .

回复于 2024-04-24T03:49:22+08:00

以下是我为防止暂停打嗝问题而采取的措施：

Swift:

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

Objective 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];
                    }];

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

回复于 2024-04-24T03:49:22+08:00

我建议使用AVQueuePlayer无缝循环播放视频 . 添加通知观察器

AVPlayerItemDidPlayToEndTimeNotification

并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];

回复于 2024-04-24T03:49:22+08:00

为了避免视频倒带时的差距，在合成中使用同一资产的多个副本对我来说效果很好 . 我在这里找到了它：www.developers-life.com/avplayer-looping-video-without-hiccupdelays.html（链接现已死） .

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];

回复于 2024-04-24T03:49:22+08:00

适用于Swift 3和4

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

回复于 2024-04-24T03:49:22+08:00

这对我来说没有打嗝问题， point is in pausing 在调用seekToTime方法之前的播放器：

init 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()

注册通知

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

videoLoop功能

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

回复于 2024-04-24T03:49:22+08:00

将视频加载到AVPlayer后（当然是通过其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viewWillDisappear方法中：

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

在视图控制器的实现文件中的接口声明中：

id _notificationToken;

在尝试之前需要看到这个正常运行？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

在我的应用程序中，它使用了这个代码，在视频结束和开头之间没有任何暂停 . 事实上，根据视频，我无法再将视频告诉视频，保存时间码显示 .

回复于 2024-04-24T03:49:22+08:00

-1

你可以添加一个AVPlayerItemDidPlayToEndTimeNotification观察者并从选择器中的start开始重放视频，代码如下

//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];
}

回复于 2024-04-24T03:49:22+08:00

我的解决方案在Objective-c和AVQueuePlayer中 - 似乎你必须复制AVPlayerItem并在完成第一个元素的播放后立即添加另一个副本 . “有点”是有道理的，对我来说没有任何打嗝

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

回复于 2024-04-24T03:49:22+08:00

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)

回复于 2024-04-24T03:49:22+08:00

我做的是让它循环播放，就像我的代码如下：

[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];
    }
}];

回复于 2024-04-24T03:49:22+08:00

257

在Xcode 10.1中 Swift 4.2 .

Yes ，有一种相对简单的方法可以使用 AVQueuePlayer() ，键值观察（KVO）技术和一个令牌来循环 AVKit / AVFoundation 中的视频 .

这绝对适用于一堆H.264 / HEVC视频，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() }
            }
        }
    }
}

回复于 2024-04-24T03:49:22+08:00

使用AVPlayerViewController下面的代码，它为我工作

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()

所有控件都要展示，希望它有所帮助

回复于 2024-04-24T03:49:22+08:00

/* "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 AVAudioPlayer 中定义 . 希望这可以帮到你 . 我正在使用Xcode 6.3 .

回复于 2024-04-24T03:49:22+08:00

用AVFoundation AVPlayer循环播放视频？

16 回答

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