在opencv中以视频.3gpp格式逐帧拍摄

Question

正如有人在stackoverflow中建议的那样，我尝试使用代码从视频中逐个获取帧，如下所示：

String STR=(String) Environment.getExternalStorageDirectory().getAbsolutePath();

FrameGrabber videoGrabber = new FFmpegFrameGrabber(STR+"/vd.3gpp");
           try 
            {
                videoGrabber.setFormat("video format goes here");
                videoGrabber.start();    
            } catch (com.googlecode.javacv.FrameGrabber.Exception e) 
            {           
                Log.e("javacv", "Failed to start grabber" + e);     
                return ;  
            }


            Frame vFrame = null;

            do
            {
                try
                {
                    vFrame = videoGrabber.grabFrame();
                    if(vFrame != null);
                        //do your magic here
                } catch (com.googlecode.javacv.FrameGrabber.Exception e) 
                {
                    Log.e("javacv", "video grabFrame failed: "+ e);
                }
            }while(vFrame != null);

            try 
            {
                videoGrabber.stop();
            }catch (com.googlecode.javacv.FrameGrabber.Exception e) 
            {
                Log.e("javacv", "failed to stop video grabber", e);
                return ;
            }

但我意外地无法运行应用程序。任何人都可以建议我从存储的视频中获取所有帧的解决方案吗？