[mjpeg @ 0x27ee9e0] buffer smaller than minimum size

- 日理万妓 2022-07-24 05:07 103阅读 0赞

在利用opencv读取视频，去除视频画面上的水印、台标和logo，并重新在生成新的视频。VideoWriter 类出现报错 “\[mjpeg @ 0x27ee9e0\] buffer smaller than minimum size”，查了很久都没有找到原因。

代码如下：

<span style="font-size:14px;">#include "stdio.h"
    #include "stdlib.h"
    #include "time.h"
    #include <opencv2/core/core.hpp>
    #include <opencv2/highgui/highgui.hpp>
    #include <opencv2/imgproc/imgproc.hpp>
    #include "opencv2/photo/photo.hpp"
    
    #include <iostream>
    
    using namespace std;
    using namespace cv;
    int  main()
    {
    	clock_t start, finish;
    	start = clock();
    	cout << "start!!" << endl;
    	string video_path = "/home/dyx/Desktop/test_logs/";
    	VideoCapture capture(video_path + "test.mp4");
    	if (!capture.isOpened())
    		cout << "fail to open!" << endl;
    	//获取帧率
    	double fps =capture.get( CV_CAP_PROP_FPS);
    	cout << "帧率为:" << fps << endl;
    	Size videoSize(capture.get( CV_CAP_PROP_FRAME_WIDTH),capture.get( CV_CAP_PROP_FRAME_HEIGHT));
    
    	int tem=CV_FOURCC('F', 'L', 'V', '1');
    	cout<<tem<<endl;
    
    	VideoWriter writer(video_path + "VideoTest.avi", CV_FOURCC('D', 'I', 'V', 'X') , fps, videoSize);
    	//	VideoWriter writer(video_path + "VideoTest.avi", CV_FOURCC('F', 'L', 'V', '1'), fps, videoSize);
    	//VideoWriter writer(video_path + "VideoTest264.avi", CV_FOURCC('X', '2', '6', '4'), fps, videoSize);
    	Mat frame;
    	Mat inpainted;
    	Mat inpaintMask = imread("/home/dyx/Desktop/test_logs/log5.jpg");
    	cv::cvtColor(inpaintMask, inpaintMask, CV_BGR2GRAY);
    	int i = 0;
    	while (capture.isOpened())
    	{
    		i++;
    		cout << i << endl;
    		capture >> frame;
    		if (!capture.read(frame)||i>=10000)// get a new frame from camera or video
    		{
    			cout<<"finlish!"<<endl;
    			break;
    		}
    		inpaint(frame, inpaintMask, inpainted, 8, CV_INPAINT_TELEA);
    		writer << inpainted;
    		//cvWaitKey(1000 / fps);
    		if (cvWaitKey(20) == 27)
    		{
    			break;
    		}
    		imshow("video", inpainted);
    
    	}
    	finish = clock();
    	long time = (double)(finish - start) / CLOCKS_PER_SEC;
    	cout << time << endl;
    	printf("时间：%f seconds\n", time);
    	return 0;
    }
    </span>

最后，通过调试发现是代码的问题，主要是VideoWriter的videoSize出了问题。把“Size videoSize(CV\_CAP\_PROP\_FRAME\_WIDTH,CV\_CAP\_PROP\_FRAME\_HEIGHT) ”改为“Size videoSize(capture.get( CV\_CAP\_PROP\_FRAME\_WIDTH),capture.get( CV\_CAP\_PROP\_FRAME\_HEIGHT))”，即可解决！

因为CV\_CAP\_PROP\_FRAME\_WIDTH=3，CV\_CAP\_PROP\_FRAME\_HEIGHT=4，即为videoSize（3,4），新生成的视频的宽高太小导致的。视频videoSize的大小最好不要小于videoSize（320,240）.