在SKVideoNode中播放视频会导致播放开始前出现黑色闪光灯。

Question

我正在使用雪碧套件和SKVideoNode播放一个简短的视频。当视频节点被添加到场景中时，是在初始设置之后的场景之前，播放机会闪烁一段时间的黑色。

我已经尝试使用AVPlayer来代替直接的视频，我也使用KVO只在视频显示它可以播放的时候加载SKVideoNode。

不管怎样，在我的视频开始播放之前，我会得到一个黑色的闪光灯。

而且，似乎没有一种方法可以将AVPlayerLayer添加到SKScene/SKView中，尽管我不知道这是否有帮助。

任何关于下一步该尝试什么的建议都会很棒。

这是我正在使用的代码

- (void)didMoveToView:(SKView *)view
{
    if (!self.contentCreated) {
        [self createSceneContents];
    }
}

- (void)createSceneContents
{
    NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"IntroMovie" ofType:@"mov"];
    NSURL *introVideoURL = [NSURL fileURLWithPath:resourcePath];
    self.playerItem = [AVPlayerItem playerItemWithURL:introVideoURL];
    self.player = [[AVPlayer alloc] initWithPlayerItem:self.playerItem];

    [self.playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];

    SKSpriteNode *playButton = [SKSpriteNode spriteNodeWithImageNamed:@"PlayButton"];
    [playButton setPosition:CGPointMake(CGRectGetMidX(self.view.frame), (CGRectGetMidY(self.view.frame) / 5) * 3)];
    [self addChild:playButton];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if ([keyPath isEqualToString:@"status"]) {
        if ([[change objectForKey:NSKeyValueChangeNewKey] integerValue] == AVPlayerItemStatusReadyToPlay) {
            NSLog(@"Change has the following %@", change);
                [self.player prerollAtRate:0 completionHandler:^(BOOL done){
                    SKVideoNode *introVideo = [SKVideoNode videoNodeWithAVPlayer:self.player];
                    [introVideo setSize:CGSizeMake(self.size.width, self.size.height)];
                    [introVideo setPosition:self.view.center];
                    [self addChild:introVideo];
                    [introVideo play];
                    [self.playerItem removeObserver:self forKeyPath:@"status"];
                }];
        }
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

这是另一段代码，它只播放视频，在加载的视频和播放的视频之间发出相同的黑色闪光灯。

NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"IntroMovie" ofType:@"m4v"];
NSURL *introVideoURL = [NSURL fileURLWithPath:resourcePath];
self.playerItem = [AVPlayerItem playerItemWithURL:introVideoURL];
self.player = [[AVPlayer alloc] initWithPlayerItem:self.playerItem];

SKVideoNode *introVideo = [SKVideoNode videoNodeWithAVPlayer:self.player];
[introVideo setSize:CGSizeMake(self.size.width, self.size.height)];
[introVideo setPosition:self.view.center];
[self addChild:introVideo];
[introVideo play];

Answer 1

我也遇到了类似的问题，就这样解决了：

我将视频的第一帧输出为PNG。然后，我在SKSpriteNode前面添加了一个带有PNG的SKVideoNode。启动视频时，我将SKSpriteNode的SKSpriteNode属性设置为YES。

下面是我的代码的一个简化示例和相关部分：

-(void)didMoveToView:(SKView *)view {    

    // add first frame on top of the SKVideoNode 
    firstFrame = [SKSpriteNode spriteNodeWithImageNamed:@"firstFrame"];
    firstFrame.zPosition = 1;
    [self addChild:firstFrame];

    // here I add the SKVideoNode with AVPlayer  
    ......

    // Add KVO  
    [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];

}


- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if (object == player.currentItem && [keyPath isEqualToString:@"status"]) {
        if (player.currentItem.status == AVPlayerItemStatusReadyToPlay) {

            [introVideo play]; 
            firstFrame.hidden = YES;             
        }
    }
}

这是迄今为止我找到的最好的解决方案。我希望这对你有帮助！

Answer 2

有同样的问题。我的解决办法：

videoNode = SKVideoNode(AVPlayer: player)
videoNode.hidden = true

player.addBoundaryTimeObserverForTimes([1/30.0], queue: dispatch_get_main_queue()) { [unowned self] () -> Void in
    self.videoNode.hidden = false
}

Answer 3

奇怪的问题..。你能不用AVPlayerItem试试吗？就像这样：

  NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"IntroMovie" 
                                                           ofType:@"m4v"];
  NSURL *introVideoURL = [NSURL fileURLWithPath:resourcePath];

  AVPlayer *player = [AVPlayer playerWithURL: introVideoURL];

  SKVideoNode *introVideo = [[SKVideoNode alloc] initWithAVPlayer: player];

  [introVideo setSize:CGSizeMake(self.size.width, self.size.height)];
  [introVideo setPosition:self.view.center];
  [self addChild:introVideo];
  [introVideo play];