android media player shows audio but no video

I am using media player to stream a video. It only plays the audio but not the video. Could anyone help? My code is below.

public class VideoViewApplication extends Application {

    @Override
    public void onCreate() {
    }

    @Override
    public void onTerminate() {
    }
}


public class VideoViewDemo extends Activity implements 

    OnErrorListener,OnBufferingUpdateListener, OnCompletionListener,
    MediaPlayer.OnPreparedListener, SurfaceHolder.Callback  {

    private static final String TAG = "VideoViewDemo";

    private MediaPlayer mp;
    private EditText mPath;  
    private SurfaceHolder holder;

    private ImageButton mPlay;
        private ImageButton mPause;
    private ImageButton mReset;
    private ImageButton mStop;
    private String current;
    private SurfaceView mPreview;


    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        mPreview = (SurfaceView) findViewById(R.id.surface);

        mPath = (EditText) findViewById(R.id.path);
        mPath.setText("rtsp://video2.americafree.tv/AFTVHorrorH26496.sdp");

        mPlay = (ImageButton) findViewById(R.id.play);
        mPause = (ImageButton) findViewById(R.id.pause);
        mReset = (ImageButton) findViewById(R.id.reset);
        mStop = (ImageButton) findViewById(R.id.stop);


        mPlay.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                playVideo();
            }
        });
        mPause.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (mp != null) {
                    mp.pause();
                }
            }
        });
        mReset.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (mp != null) {
                    mp.seekTo(0);
                }
            }
        });
        mStop.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (mp != null) {
                    current = null;
                    mp.stop();
                    mp.release();
                }
            }
        });

        // getWindow().setFormat(PixelFormat.TRANSPARENT);
        holder = mPreview.getHolder();
        holder.addCallback(this);
        holder.setFixedSize(100, 100);

        runOnUiThread(new Runnable(){
            public void run(){
                playVideo();
            }
        });
    }

    private void playVideo() {
        try {
            final String path = mPath.getText().toString();
            Log.v(TAG, "path: " + path);

            if (path.equals(current) && mp != null) {
                mp.start();
                return;
            }
            current = path;

            mp = new MediaPlayer();
            mp.setOnErrorListener(this);
            mp.setOnBufferingUpdateListener(this);
            mp.setOnCompletionListener(this);
            mp.setOnPreparedListener(this);
            mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mp.setScreenOnWhilePlaying(true);

            mp.setDisplay(mPreview.getHolder());
            mp.setDataSource(path);
            mp.prepare();

            Log.v(TAG, "Duration: ===>" + mp.getDuration());
            mp.start();

        } catch (Exception e) {
            Log.e(TAG, "error: "+ e.getMessage(), e);
            if (mp != null) {
                mp.stop();
                mp.release();
            }
        }
    }

    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
        Log.d(TAG, "surfaceChanged called");
    }

    public void surfaceCreated(SurfaceHolder arg0) {
        Log.d(TAG, "surfaceCreated called");
    }

    public void surfaceDestroyed(SurfaceHolder arg0) {
        Log.d(TAG, "surfaceDestroyed called");
    }

    public void onPrepared(MediaPlayer arg0) {
        Log.d(TAG, "onPrepared called");
    }

    public void onCompletion(MediaPlayer arg0) {
        Log.d(TAG, "onCompletion called");
    }

    public void onBufferingUpdate(MediaPlayer mediaPlayer, int percent) {
        Log.d(TAG, "onBufferingUpdate called --->   percent:" + percent);
    }

    public boolean onError(MediaPlayer mediaPlayer, int what, int extra) {
        Log.e(TAG, "onError---> what:"+what+"   extra:"+extra);
        if (mediaPlayer != null) {
            mediaPlayer.stop();
            mediaPlayer.release();
        }
        return true;
    }


}



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >
    <EditText android:id="@+id/path"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
            />
    <SurfaceView
            android:id="@+id/surface"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">
    </SurfaceView>

    <LinearLayout
            android:orientation="horizontal"
            android:layout_height="wrap_content"
            android:layout_width="fill_parent"
            >
        <ImageButton android:id="@+id/play"
                     android:layout_height="wrap_content"
                     android:layout_width="wrap_content"
                     android:src="@drawable/play"/>
        <ImageButton android:id="@+id/pause"
                     android:layout_height="wrap_content"
                     android:layout_width="wrap_content"
                     android:src="@drawable/pause"/>
        <ImageButton android:id="@+id/reset"
                     android:layout_height="wrap_content"
                     android:layout_width="wrap_content"
                     android:src="@drawable/reset"/>
        <ImageButton android:id="@+id/stop"
                     android:layout_height="wrap_content"
                     android:layout_width="wrap_content"
                     android:src="@drawable/stop"/>
    </LinearLayout>
</LinearLayout>

回答1:

I had this problem and solved it by setting the type using this depreciated method.

holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

Worth a try, and if it works you could investigate why the type isn't automatically set as it is supposed to be.

回答2:

I had the same problem and it was due to the surface not being ready to play back video.

You should try and call playVideo() from the surfaceCreated() handler.

public void surfaceCreated(SurfaceHolder holder) {
        runOnUiThread(new Runnable(){
            public void run(){
                playVideo();
            }
        });
}

回答3:

I had this problem and solved it by adding in my release function visible=gone to surfaceview:

  public void release() {
    if (mMediaPlayer != null) {
    setVisibility(View.GONE);
      mMediaPlayer.reset();
      mMediaPlayer.release();
      mMediaPlayer = null;
      mCurrentState = STATE_IDLE;}
  }

and set visible=visible in onprepared function:

   videoView.setOnPreparedListener(new OnPreparedListener() {
            public void onPrepared(MediaPlayer mp) {
                audio=false; video=false; int ty=mp.getTrackInfo().length;
                for (int i=0; i<ty;i++)
                {
                    if (mp.getAudioTrack()>-1) {audio=true;}
                    if (mp.getVideoTrack()>-1) {video=true;}
                }

                if (((audio==false)&&(skip==true))||((video==false)&&(skip2==true))||((video==true)&&(skip4==true))) 
                {   notifybar("...");
                    nexttr();} else {
                if (vis==true) {
                if (video==false) {
                    if (mVisualizerView.getVisibility()!=View.VISIBLE) {mVisualizerView.setVisibility(View.VISIBLE);}
                        mVisualizerView.link(videoView.getAudioSessionId());
                        vis2=true;
                        } else if (vis2==true){
                       mVisualizerView.release();
                       mVisualizerView.setVisibility(View.GONE);
                      vis2=false;
                        }}
                //this
                if (video==true) {
                if (videoView.getVisibility()!=View.VISIBLE) {videoView.setVisibility(View.VISIBLE);}
                } else {if (videoView.getVisibility()!=View.INVISIBLE) {videoView.setVisibility(View.INVISIBLE);}
                }