[mjpeg @ 0x27ee9e0] buffer smaller than minimum size

在利用opencv讀取視頻，去除視頻畫面上的水印、台標和logo，並重新在生成新的視頻。VideoWriter 類出現報錯 “[mjpeg @ 0x27ee9e0] buffer smaller than minimum size”，查了很久都沒有找到原因。

代碼如下：

<span >#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;
	//獲取幀率
	double fps =capture.get( CV_CAP_PROP_FPS);
	cout << "幀率為:" << 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("時間：%f seconds\n", time);
	return 0;
}
</span>

最後，通過調試發現是代碼的問題，主要是VideoWriter的videoSize出了問題。把“Size videoSize(CV_CAP_PROP_FRAME_WIDTH,CV_CAP_PROP_FRAME_HEIGHT) ”改為“Size videoSize(capture.get( CV_CAP_PROP_FRAME_WIDTH),capture.get( CV_CAP_PROP_FRAME_HEIGHT))”，即可解決！

因為CV_CAP_PROP_FRAME_WIDTH=3，CV_CAP_PROP_FRAME_HEIGHT=4，即為videoSize（3,4），新生成的視頻的寬高太小導致的。視頻videoSize的大小最好不要小於videoSize（320,240）.