1 private void PlayVideoBack(Bitmap frame)
 2 {
 3      lock (obLock)
 4     {
 5        BitmapData frame1Data = null;
 6        BitmapData frame2Data = null;
 7        try
 8        {
            //防止大分辨率视频的时候内存来不及释放而溢出        
 9          if (_frame == null || _frame.Width != frame.Width || _frame.Height != frame.Height)
10          {
11             _frame = new Bitmap(frame.Width, frame.Height, frame.PixelFormat);
12          }
13           frame1Data = _frame.LockBits(new Rectangle(0, 0, _frame.Width, _frame.Height), ImageLockMode.ReadWrite, _frame.PixelFormat);
15           frame2Data = frame.LockBits(new Rectangle(0, 0, _frame.Width, _frame.Height), ImageLockMode.ReadWrite, _frame.PixelFormat);
17          Win32API.CopyMemory(frame1Data.Scan0, frame2Data.Scan0, (uint)(frame1Data.Stride * frame1Data.Height)); 
18        }
19          finally
20         {
21          if (frame1Data != null)
22           {
23                _frame.UnlockBits(frame1Data);
24            }
25          if (frame2Data != null)
26           {
27                 frame.UnlockBits(frame2Data);
28           }
29        }
30          Graphics g = _playBackPictureBox.CreateGraphics();
31           g.DrawImage(frame, new Rectangle(0, 0, _playBackPictureBox.Width , _playBackPictureBox.Height));
32           g.Dispose();           
33            frame.Dispose();
34             }
35         }