为什么frameGrabber.start（）不从视频文件中抓取帧

Question

这里是JAVA中的下面代码

公共课阅读{

public static void main(String []args) throws IOException, Exception, InterruptedException, ExecutionException
{

// Runtime.getRuntime（）。exec（＆＃34; ffmpeg -r 1 -i sample％d.png -s 320x240 -sepect 4：3 CHANDIGARH.mp4＆＃34;）;         FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber（＆＃34; C：/Users/Danish/Music/CHANDIGARH.mp4"）;         frameGrabber.setFrameNumber（0）;         frameGrabber.start（）;

    IplImage i;



    try {
        for(int ii=0;ii<=frameGrabber.getLengthInFrames();ii++){

            OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage();      

              Java2DFrameConverter paintConverter = new Java2DFrameConverter();
             i = converter.convert(frameGrabber.grab());


            Frame frame = converter.convert(i);
            BufferedImage img=paintConverter.getBufferedImage(frame,1);
            IplImage iplImage = converter.convert(paintConverter.convert(img));

        String path = "F:\\"+ii+".png";
        ImageIO.write(img,"png", new File(path));

        }
        frameGrabber.stop();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


}

}