Android 播放视频问题：设备特定

Question

我使用以下代码来播放视频。它工作正常。

videoView = (VideoView) findViewById(R.id.VideoView);

File f=new File(Environment.getExternalStorageDirectory(), "words/"+videoname);
Uri video = Uri.parse(f.getAbsolutePath());            

videoView.setVideoURI(video);

videoView.start();

但有时一些特定文件开始播放并且几乎在视频结束时，它会给出以下消息的错误。

Cannot play video
Sorry, this video cannot be played

仅当我尝试 Motorola Droid 时才会发生这种情况。

在日志中它给出以下错误。

04-16 11:46:12.244: WARN/MediaPlayer(7541): info/warning (1, 44)
04-16 11:46:12.244: INFO/MediaPlayer(7541): Info (1,44)
04-16 11:46:12.244: DEBUG/MediaPlayer(7541): getMetadata
04-16 11:46:12.268: DEBUG/AudioHardwareMot(7788): AudioMgr:Output 0xb538 exiting standby
04-16 11:46:14.018: WARN/AudioSystem(7112): AudioFlinger server died!
04-16 11:46:14.018: WARN/AudioSystem(7112): AudioPolicyService server died!
04-16 11:46:14.018: INFO/ServiceManager(1040): service 'media.audio_flinger' died
04-16 11:46:14.018: INFO/ServiceManager(1040): service 'media.player' died
04-16 11:46:14.018: INFO/ServiceManager(1040): service 'media.camera' died
04-16 11:46:14.018: INFO/ServiceManager(1040): service 'media.audio_policy' died
04-16 11:46:14.018: WARN/MediaPlayer(7541): MediaPlayer server died!
04-16 11:46:14.018: ERROR/MediaPlayer(7541): error (100, 0)
04-16 11:46:14.018: ERROR/MediaPlayer(7541): Error (100,0)
04-16 11:46:14.018: DEBUG/VideoView(7541): Error: 100,0
04-16 11:46:14.557: INFO/(7802): ServiceManager: 0xad80

但同一个文件在其他设备上播放没有任何问题。可能是什么问题？