MediaPlayerLauncher无法不定期地在wp8中打开文件

Question

记录我正在使用此代码的AAC文件：

dev = await AudioVideoCaptureDevice.OpenForAudioOnlyAsync();
dev.AudioEncodingFormat = CameraCaptureAudioFormat.Aac;
IStorageFolder applicationFolder = ApplicationData.Current.LocalFolder;
var dataFolder = await applicationFolder.CreateFolderAsync("data", CreationCollisionOption.OpenIfExists);
outputFile = await dataFolder.CreateFileAsync(audioFileName, CreationCollisionOption.ReplaceExisting);
var stream = await outputFile.OpenAsync(FileAccessMode.ReadWrite);
await dev.StartRecordingToStreamAsync(stream);

我通过Click Handler with

停止录制

  await dev.StopRecordingAsync();

现在我将打开文件

  MediaPlayerLauncher mediaPlayerLauncher = new MediaPlayerLauncher();
  mediaPlayerLauncher.Media = new Uri(outputFile.Path, UriKind.Relative);
  mediaPlayerLauncher.Location = MediaLocationType.Data;
  mediaPlayerLauncher.Show();

通常这会起作用：它会立即播放文件 - 所有内容都会出现。 但是，有大约20％的测试用例，MediaPlayerLauncher将打开并提示：

"Sorry, we can't play this file on your phone"

当我尝试一次又一次地打开同一个项目时，最终它会在一段时间后播放。

任何人都知道我能做些什么呢？

感谢。