问无法在Android MediaPlayer中播放RTSP视频

EN

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    /* 1. Using VideoView, error: "Cannot play video"
    VideoView vidView = (VideoView) findViewById(R.id.myVideo);

    String vidAdress = "rtsp://10.42.0.91:5554/camera";
    Uri vidUri = Uri.parse(vidAdress);

    vidView.setVideoURI(vidUri);

    vidView.start();

    */

    //Using native player (implicit intent), works.
    String mediaURL = "rtsp://10.42.0.91:5554/camera";
    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(mediaURL));
    startActivity(intent);

    /* Using MediaPlayer (doesn't work). Error: "Cannot create MediaPlayer"
and setDataSource.
    setVolumeControlStream(AudioManager.STREAM_MUSIC);
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

    try
    {
        mediaPlayer.setDataSource("rtsp://10.42.0.91:5554/camera");
        mediaPlayer.prepare();
        mediaPlayer.start();
    }
    catch (IOException ex)
    {
        ex.printStackTrace();
    }
    */