android獲取當前視頻的截圖

Question

我已經看到很多關於這個的老問題，也許現在有一些解決方案。 我想截取我的視頻的當前幀的截圖。 Videoview使用rtsp-stream顯示實時視頻。

我嘗試采用位圖，但它始終是黑色的

public static Bitmap loadBitmapFromView(View v) {
    Bitmap b = Bitmap.createBitmap(v.getLayoutParams().width , v.getLayoutParams().height, Bitmap.Config.ARGB_8888);                
    Canvas c = new Canvas(b);
    v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
    v.draw(c);
    return b;
}

編輯： MediaMetadataRetriever不能與流網址一起使用，也許適用於視頻文件。 在此鏈接上使用lib（它是啟用rtsp協議輸入的MediaMetadataRetriever包裝器）我可以保存一幀視頻，但實時視頻視圖有10秒的延遲，因為它必須與流服務器建立新連接。

我沒有測試ThumbnailUtils ，但在Api中我讀到輸入只是文件路徑

Answer 1

使用TextureView代替VideoView。 TextureView有getBitmap（）方法。 以下是TextureView作為videoView的用法

public class TextureVideoActivity extends Activity implements TextureView.SurfaceTextureListener {

private static final String FILE_NAME = "myVideo.mp4";
private static final String TAG = TextureVideoActivity.class.getName();

private MediaPlayer mMediaPlayer;
private TextureView mPreview;

@Override
public void onCreate(Bundle icicle) {

    super.onCreate(icicle);
    setContentView(R.layout.activity_texture_video);

    mPreview = (TextureView) findViewById(R.id.textureView);
    mPreview.setSurfaceTextureListener(this);

}

public Bitmap getBitmap(){
   return  mPreview.getBitmap();
}

public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
    Surface surface = new Surface(surfaceTexture);

    try {
        mMediaPlayer = new MediaPlayer();
        mMediaPlayer
                .setDataSource(this, Uri.parse(FILE_NAME));
        mMediaPlayer.setSurface(surface);
        mMediaPlayer.setLooping(true);

        // don't forget to call MediaPlayer.prepareAsync() method when you use constructor for
        // creating MediaPlayer
        mMediaPlayer.prepareAsync();
        // Play video when the media source is ready for playback.
        mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mediaPlayer) {
                mediaPlayer.start();
            }
        });

    } catch (IllegalArgumentException e) {
        Log.d(TAG, e.getMessage());
    } catch (SecurityException e) {
        Log.d(TAG, e.getMessage());
    } catch (IllegalStateException e) {
        Log.d(TAG, e.getMessage());
    } catch (IOException e) {
        Log.d(TAG, e.getMessage());
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (mMediaPlayer != null) {
        // Make sure we stop video and release resources when activity is destroyed.
        mMediaPlayer.stop();
        mMediaPlayer.release();
        mMediaPlayer = null;
    }
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int i, int i2) {

}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
    return false;
}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {

}
}

在TextureView上播放視頻