Question

我正在使用AVQueuePlayer按顺序播放视频（虽然我在播放之间打嗝）。现在我想：

1）循环该序列中的最后一项（而不是完整项）。

2）这样做，我也想消除打嗝。

以下是我播放视频序列的代码。我怎么能实现我的2个目标？

[super viewDidLoad];

NSString *secondVideoPath = [[NSBundle mainBundle] pathForResource:@"vid_1" ofType:@"mov"];
NSString *firstVideoPath = [[NSBundle mainBundle] pathForResource:@"vid_2" ofType:@"mov"];


AVPlayerItem *firstVideoItem = [AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:firstVideoPath]];
AVPlayerItem *secondVideoItem = [AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:secondVideoPath]];

queuePlayer = [AVQueuePlayer queuePlayerWithItems:[NSArray arrayWithObjects:firstVideoItem, secondVideoItem,nil]];

AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:queuePlayer];
avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
layer.frame = CGRectMake(0, 0, 1024, 768);

[self.view.layer addSublayer:layer];

[queuePlayer play];

我想到的另一种方法是播放1长视频并循环播放它的最后几秒。也许我也可以这样避免打嗝。这种方法是否可以实现？如果是这样，如何调整下面的代码（播放1个视频）？

[super viewDidLoad];
NSString *filepath = [[NSBundle mainBundle] pathForResource:@"vid_long" ofType:@"mov"];
NSURL *fileURL = [NSURL fileURLWithPath:filepath];
avPlayer = [AVPlayer playerWithURL:fileURL];

AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];
avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
layer.frame = CGRectMake(0, 0, 1024, 768);
[self.view.layer addSublayer: layer];

[avPlayer play];

Answer 1

以下是循环播放视频的解决方案： -

queuePlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone; 
int k=0;
 [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(itemPlayEnded:)
                                               name:AVPlayerItemDidPlayToEndTimeNotification
                                             object:[queuePlayer currentItem]];

- (void)itemPlayEnded:(NSNotification *)notification 
{
 k++;
 if(k<10-15 times)
 {
  AVPlayerItem *p = [notification object];
  [p seekToTime:kCMTimeZero];
 }
}

编辑回答： - 上面的答案播放相同的文件，但这对我有用。它在循环中播放最后添加的文件：

- (void)itemPlayEnded1:(NSNotification *)notification
{
    NSString *secondVideoPath = [[NSBundle mainBundle] pathForResource:@"video2" ofType:@"mp4"];
      k=0;
    AVPlayerItem *secondVideoItem = [AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:secondVideoPath]];
    // AVPlayerItem *p = [notification object];
    NSMutableArray *currentItemArray = [NSMutableArray arrayWithObjects:secondVideoItem,nil];
    AVQueuePlayer* queuePlayer = [[AVQueuePlayer alloc] initWithItems:currentItemArray];
    [queuePlayer play];
    queuePlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

    AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:queuePlayer];
    avPlayer.actionAtItemEnd = AVPlayerItemStatusReadyToPlay;
    layer.frame = CGRectMake(0, 0, 1024, 768);        
    [self.view.layer addSublayer:layer];       

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

}

Answer 2

我能找到的最佳方式是

观察AVQueuePlayer中的每个播放项目。

queuePlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
for(AVPlayerItem *item in items) {
    [[NSNotificationCenter defaultCenter] addObserver:self 
            selector:@selector(nextVideo:) 
            name:AVPlayerItemDidPlayToEndTimeNotification 
            object:item ];
}

每个nextVideo上的

再次插入currentItem以将其排队以进行回放。确保为每个项目寻求零。在advanceToNextItem之后，AVQueuePlayer将从队列中删除currentItem。我们只是重新插入。

-(void) nextVideo:(NSNotification*)notif {
    AVPlayerItem *currItem = notif.userInfo[@"object"];
    [currItem seekToTime:kCMTimeZero];
    [queuePlayer advanceToNextItem];
    [queuePlayer insertItem:currItem afterItem:nil];
}

Answer 3

我发现实现这一目标的唯一方法是采用Apple的Using AVQueuePlayer to demonstrate loop playback样本。您需要添加自己的代码才能播放初始视频，然后循环播放另一个视频，但该方法比我尝试的其他方法效果更好。

AVQueuePlayer：循环队列中的最后一项（并消除打嗝）或循环播放视频的最后几秒

3 个答案: