连续播放两个视频导致短黑屏

Question

我有一个应用程序，我可以在触摸视图后播放电影，然后当电影结束时。我在视图上放置了一个按钮。单击该按钮后，将播放第二部影片。但似乎只有在加载之后，才会出现一个短小的黑屏。我现在想避开黑屏...

代码如下：

viewDidLoad中的初始化

[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

NSString *movpath = [[NSBundle mainBundle] 
                     pathForResource:@"movie1" 
                     ofType:@"m4v"];

mpviewController = 
[[MPMoviePlayerViewController alloc]
 initWithContentURL:[NSURL fileURLWithPath:movpath]]; 

[[NSNotificationCenter defaultCenter]
 addObserver:self
 selector:@selector(movieFinishedCallback:)                                                 
 name:MPMoviePlayerPlaybackDidFinishNotification
 object:nil];


mp = [mpviewController moviePlayer];
// [mp setMovieControlMode:MPMovieControlModeHidden];
// [mp.view setFrame:CGRectMake(0, 0, 250, 263)]; 
mp.controlStyle = MPMovieControlStyleNone;    
mp.shouldAutoplay = NO;

[mp prepareToPlay];
[mp pause];

然后在故事板上，我调用了startAnimation

- (IBAction)startAnimation:(id)sender {

     NSLog(@"Animation 1");  
    [self.view addSubview:mpviewController.view];
    [mp play];
}

在这部电影结束后，我按下按钮

- (void) movieFinishedCallback:(NSNotification*) aNotification {
   NSLog(@"...movie done");

// generate start button for animation 2
startAnimation2Button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
startAnimation2Button.tag = 1;
[startAnimation2Button addTarget:self action:@selector(startAnimation2:) forControlEvents:UIControlEventTouchUpInside];
startAnimation2Button.frame = CGRectMake(130, 230, 070, 070);
startAnimation2Button.userInteractionEnabled = YES;
startAnimation2Button.alpha = 0.1;

[self.view addSubview:startAnimation2Button];
}

然后，在触摸按钮之后，第二个动画开始

- (IBAction)startAnimation2:(id)sender  {

    NSLog(@"Animation 2");
    NSString *movpath = [[NSBundle mainBundle] 
                     pathForResource:@"movie2" 
                     ofType:@"m4v"];
    [mp setContentURL:[NSURL fileURLWithPath:movpath]];

    [[NSNotificationCenter defaultCenter]
         addObserver:self
         selector:@selector(movieFinishedCallback2:)                                                 
         name:MPMoviePlayerPlaybackDidFinishNotification
         object:nil];

    [mp play];
}

但这里出现了一个很短的黑屏，可能是在movie2加载并播放的时候。

如何避免黑屏？

Greetz

Answer 1

在使用MPMoviePlayerController时，您无法完全摆脱视频之间的预缓冲延迟(黑相)。

请改用AVQueuePlayer。

AVQueuePlayer是AVPlayer的一个子类，您可以使用它按顺序播放多个项目。

有关这一问题，请参阅其他questions and issues。