OS X 上的 AVPlayer 错误

Question

我正在开发一个 mac 应用程序，它应该在按下按钮时在新窗口中播放来自 url 的视频。要创建 AVPlayer，我有：

AVURLAsset *urlAsset = [AVURLAsset assetWithURL:url];
AVPlayerItem *playeritem = [AVPlayerItem playerItemWithAsset:urlAsset];
_vidPlayer.player = [AVPlayer playerWithPlayerItem:playeritem];

其中 url 是指向 m4v 视频文件的 http NSURL，而 _vidPlayer 是 AVPlayerView。视频播放器出现，但播放按钮保持灰色，我得到一整堵我不明白的日志输出，见下文。任何意见，将不胜感激。

[22:12:42.904] FigAtomStreamInitWithByteStreamWithSize signalled err=-12893 (kFigAtomStream_OffsetOutsideOfParent) (Offset exceeds stream length) at /SourceCache/CoreMedia_frameworks/CoreMedia-1562.235/Sources/Utilities/FigAtomStream.c line 305
[22:12:42.967] FigLimitedDiskCacheProvider_CopyProperty signalled err=-12784 (kFigBaseObjectError_PropertyNotFound) (no such property) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/FigByteStreamPrototypes/FigLimitedDiskCacheProvider.c line 947
[22:12:43.146] itemasync_SetProperty signalled err=-12785 (kFigBaseObjectError_Invalidated) (invalidated) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/Player/FigPlayer_Async.c line 2293
[22:12:43.146] itemasync_SetProperty signalled err=-12785 (kFigBaseObjectError_Invalidated) (invalidated) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/Player/FigPlayer_Async.c line 2293
[22:12:43.146] itemasync_SetProperty signalled err=-12785 (kFigBaseObjectError_Invalidated) (invalidated) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/Player/FigPlayer_Async.c line 2293
[22:12:43.146] itemasync_SetProperty signalled err=-12785 (kFigBaseObjectError_Invalidated) (invalidated) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/Player/FigPlayer_Async.c line 2293
[22:12:43.146] itemasync_SetProperty signalled err=-12785 (kFigBaseObjectError_Invalidated) (invalidated) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/Player/FigPlayer_Async.c line 2293
[22:12:43.146] itemasync_CopyProperty signalled err=-12785 (kFigBaseObjectError_Invalidated) (invalidated) at /SourceCache/CoreMedia/CoreMedia-1562.235/Prototypes/Player/FigPlayer_Async.c line 2088
[22:12:43.146] (Fig) signalled err=-12871
<<< FFR_Movie >>> ParseTrackAtom: Omitting a track that encountered error -12871 during atom parsing

谢谢。

Answer 1

我在 iOS 的 swift 编码中遇到了类似的问题，我发现这个网站非常有帮助： http: //www.rockhoppertech.com/blog/swift-avfoundation/#audiofile

不确定您是否知道如何将 swift 转换为 Objective C（我当然不知道，我是新手），但她可能在这个网站上为您提供了一些其他文章。希望我能提供更多帮助，但希望此链接能为您带来答案。布埃纳斯苏尔塔！