MPMoviePlayerController在视频开始时导致黑色闪烁

Question

这部电影播放得很好,但在播放之前就有一个快速的黑色闪光灯.这是将控制风格设置为MPMovieControlStyleNone的怪癖吗？

NSString *url = [[NSBundle mainBundle] pathForResource:@"00" ofType:@"mov"];
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] 
    initWithContentURL:[NSURL fileURLWithPath:url]];

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

//---play video in implicit size---
player.view.frame = CGRectMake(80, 64, 163, 246);
[self.view addSubview:player.view];

// Hide video controls
player.controlStyle =  MPMovieControlStyleNone;

//---play movie---
[player play];

Answer 1

我刚刚遇到这个问题并通过向默认的NSNotificationCenter添加一个观察者来修复它,以找出电影何时完全准备好播放,然后将视图作为子视图添加到我的主视图中.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkMovieStatus:) name:MPMoviePlayerLoadStateDidChangeNotification object:nil];

...

if(moviePlayer.loadState & (MPMovieLoadStatePlayable | MPMovieLoadStatePlaythroughOK))
{
    [pageShown.view addSubview:moviePlayer.view];
    [moviePlayer play];
}

Answer 2

在IOS 6中,mpmoviewplayer添加了一个新属性:readyForDisplay

这就是我正在玩的东西,到目前为止一直很好:

1. 创建mpmovieplayer,添加到舞台,隐藏它.
2. 在movieController上添加播放状态通知

3. 等待displayState改变,一旦准备就显示视频控制器:

   - (void)moviePlayerPlayState:(NSNotification *)noti {
   
   if (noti.object == self.movieController) {
   
       MPMoviePlaybackState reason = self.movieController.playbackState;
   
        if (reason==MPMoviePlaybackStatePlaying) {
   
                [[NSNotificationCenter defaultCenter] removeObserver:self name: MPMoviePlayerPlaybackStateDidChangeNotification object:nil];
   
           dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
   
               while (self.movieController.view.hidden)
               {
                   NSLog(@"not ready");
                   if (self.movieController.readyForDisplay) {
   
                    dispatch_async(dispatch_get_main_queue(), ^(void) {
                        NSLog(@"show");
                        self.movieController.view.hidden=NO;
                    });
   
                   }
                   usleep(50);
               }
           });
        }
   
   }
   

   }

当播放状态更改为MPMoviePlaybackStatePlaying时,我们开始检查readyDisplayState是否要更改.

Answer 3

显然,在电影rect中有一段黑色闪光,直到足够的电影加载,因此它可以开始播放.这是我的解决方法:

1. 创建一个UIImageView并将MPMoviePlayerController放入其中.这样你就可以将alpha设置为0.

2. 一旦你打[玩家玩]; 要播放视频,请设置.5秒计时器.

3. 完成时间后,将alpha更改为1.

这将使玩家隐形1/2秒(隐藏黑色闪光).