在wp7中使用媒体启动器播放vimeo视频

Question

如何使用媒体启动器播放vimeo视频，我的代码：

MediaPlayerLauncher mediaPlayerLauncher = new MediaPlayerLauncher();
mediaPlayerLauncher.Media = new Uri("http://www.vimeo.com/39485693", UriKind.Absolute);
mediaPlayerLauncher.Location = MediaLocationType.Data;
mediaPlayerLauncher.Controls = MediaPlaybackControls.Pause | MediaPlaybackControls.Stop;
mediaPlayerLauncher.Orientation = MediaPlayerOrientation.Landscape;
mediaPlayerLauncher.Show();

但是视频没有播放，可能是因为视频格式。任何解决方案？