我正在开发一个相继播放多个视频的视频应用程序.视频存储在AVPlayerItem的数组中. AVQueuePlayer使用这些AVPlayerItem进行初始化,它会自动播放该阵列中的视频.
问题是当它改变播放下一个视频时,它被卡住了几分之一秒,或者在它从一个转换到另一个时创建了一个混蛋.我想通过某种动画来改善这种转换,比如淡入淡出,而视频被改变.
我的AVQueuePlayer代码：
AVQueuePlayer *mediaPlayer = [[AVQueuePlayer alloc] initWithItems:arrPlayerItems];
playerLayer=[AVPlayerLayer playerLayerWithPlayer:mediaPlayer];
playerLayer.frame=self.bounds;
playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
playerLayer.needsDisplayOnBoundsChange = NO;
[self.layer addSublayer:playerLayer];
self.layer.needsDisplayOnBoundsChange = YES;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(itemPlayEnded:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:[mediaPlayer currentItem]];
我尝试在转换时创建一个新的层,并通过减少其不透明度并增加新层的不透明度(创建所需的淡入淡出效果)来对旧层进行动画处理,但是它不能按需要工作.
-(void)TransitionInVideos {
if (roundf(CMTimeGetSeconds(mediaPlayer.currentTime))==roundf(CMTimeGetSeconds(mediaPlayer.currentItem.duration))) {
[self.layer addSublayer:playerLayerTmp];
//Animation for the transition between videos
[self performSelector:@selector(FadeIn) withObject:nil afterDelay:0.3];
[self performSelector:@selector(FadeOut) withObject:nil afterDelay:0.3];
}
}
-(void)FadeIn {
CABasicAnimation* fadeAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnim.fromValue = [NSNumber numberWithFloat:1.0];
fadeAnim.toValue = [NSNumber numberWithFloat:0.0];
fadeAnim.duration = 2.0;
[playerLayer addAnimation:fadeAnim forKey:@"opacity"];
[self performSelector:@selector(HideLayer) withObject:nil afterDelay:2.0];
}
-(void)FadeOut {
CABasicAnimation* fadeAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnim.fromValue = [NSNumber numberWithFloat:0.0];
fadeAnim.toValue = [NSNumber numberWithFloat:1.0];
fadeAnim.duration = 1.0;
[playerLayerTmp addAnimation:fadeAnim forKey:@"opacity"];
[self performSelector:@selector(ShowLayer) withObject:nil afterDelay:1.0];
}
-(void)HideLayer {
playerLayer.opacity=0.0;
}
-(void)ShowLayer {
playerLayerTmp.opacity=1.0;
}
如何将转换应用于AVQueuePlayer中的视频？
解决方法
我们可以设置AVMutableVideoCompositionLayerInstruction的不透明度,将导出视频或将AVPlayer作为VideoComposition属性添加到视频中,并创建淡入淡出效果.
[layerInstruction setOpacityRampFromStartOpacity:1.0 toEndOpacity:0.0 timeRange:CMTimeRangeMake(CMTimeSubtract([mutableComposition duration],CMTimeMake(Transition_Time,1)),[mutableComposition duration])]; [layerInstruction setOpacityRampFromStartOpacity:0.0 toEndOpacity:1.0 timeRange:CMTimeRangeMake(kCMTimeZero,CMTimeMake(1,1))];
更完整的例子：https://www.raywenderlich.com/30200/avfoundation-tutorial-adding-overlays-and-animations-to-videos
