Question

我尝试播放一些“媒体”，但在AVPlayer启动时我不知道它是音频还是视频。

我连接了播放器图层并且工作正常。

self.avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:[[PCPlayerManager sharedManager] audioPlayer]];
avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
avPlayerLayer.frame = CGRectMake(0, 0, videoView.frame.size.width, videoView.frame.size.height);
[videoView.layer addSublayer:avPlayerLayer];

但是如何检查是否有视频，这样我可以添加/删除一些选项？

Answer 1

来自Apple的示例代码项目AVSimplePlayer：

// Set up an AVPlayerLayer according to whether the asset contains video.
if ([[(AVAsset *)asset tracksWithMediaType:AVMediaTypeVideo] count] != 0)

Answer 2

我不确定但是AVPlayerItem有以下数组[mPlayerItem.asset.tracks]这包含两个对象，一个用于视频，另一个用于音频。如下所示[mPlayerItem.asset.tracks objectAtIndex:0]用于视频和{{ 1}}用于音频。

Answer 3

对于Swift 4.2，您可以执行以下操作：

func isAudioAvailable() -> Bool? {
   return self.player?._asset?.tracks.filter({$0.mediaType == AVMediaType.audio}).count != 0   
}

func isVideoAvailable() -> Bool? {
   return self.player?._asset?.tracks.filter({$0.mediaType == AVMediaType.video}).count != 0   
}

或作为扩展名

extension AVPlayer {
    var isAudioAvailable: Bool? {
        return self._asset?.tracks.filter({$0.mediaType == AVMediaType.audio}).count != 0
    }

    var isVideoAvailable: Bool? {
        return self._asset?.tracks.filter({$0.mediaType == AVMediaType.video}).count != 0
    }
}

Answer 4

这对我有帮助：

    // source from https://stackoverflow.com/a/55581216 Changed for last release AVFoundation
    func isAudioAvailable() -> Bool? {
        return self.player.currentItem?.tracks.filter({$0.assetTrack!.mediaType == AVMediaType.video}).count != 0
    }
    
    func isVideoAvailable() -> Bool? {
        return self.player.currentItem?.tracks.filter({$0.assetTrack!.mediaType == AVMediaType.video}).count != 0
    }

如何检查AVPlayer是否有视频或只是音频？

4 个答案: