因为要用到yuv格式视频。而眼下仅仅有avi格式的视频，所以须要转换，而且opencv不支持yuv编码的视频播放。所以须要转换为rgb编码。而后播放。写了两个程序。以供參考：

1，avi格式视频转yuv格式视频

2，播放并保存yuv视频

#include <stdlib.h>

#include <stdio.h>

#include <math.h>

#include <cv.h>

#include <highgui.h>

void avi2WriteYuv(const char *in,const char *out)

{

	cv::VideoCapture vc;

	bool flag = vc.open(in);

	if (!flag)

	{

		printf("avi file open error \n");

		system("pause");

		exit(-1);

	}

	int frmCount = vc.get(CV_CAP_PROP_FRAME_COUNT);

	frmCount -= 5;

	printf("frmCount: %d \n", frmCount);

	int w = vc.get(CV_CAP_PROP_FRAME_WIDTH);

	int h = vc.get(CV_CAP_PROP_FRAME_HEIGHT);

	printf("wwwwww%d\n", w);

	printf("hhhhhh%d\n", h);

	int bufLen = w*h * 3 / 2;

	unsigned char* pYuvBuf = new unsigned char[bufLen];

	FILE* pFileOut = fopen(out, "w+");

	if (!pFileOut)

	{

		printf("pFileOut open error \n");

		system("pause");

		exit(-1);

	}

	printf("pFileOut open ok \n");

	for (int i = 0; i<frmCount; i++)

	{

		printf("%d/%d \n", i + 1, frmCount);

		cv::Mat srcImg;

		vc >> srcImg;

		cv::imshow("img", srcImg);

		cv::waitKey(1);

		cv::Mat yuvImg;

		cv::cvtColor(srcImg, yuvImg, CV_BGR2YUV_I420);

		memcpy(pYuvBuf, yuvImg.data, bufLen*sizeof(unsigned char));

		fwrite(pYuvBuf, bufLen*sizeof(unsigned char), 1, pFileOut);

	}

	fclose(pFileOut);

	delete[] pYuvBuf;

}

void DisplayYUV2RGB(const char *dir,const char *in,int _w,int _h)

{

	int w = _w;

	int h = _h;

	printf("yuv file w: %d, h: %d \n", w, h);

	FILE* pFileIn = fopen(in, "rb+");

	int bufLen = w*h * 3 / 2;

	unsigned char* pYuvBuf = new unsigned char[bufLen];

	int iCount = 0;

	for (int i = 0; i<95; i++)

	{

		fread(pYuvBuf, bufLen*sizeof(unsigned char), 1, pFileIn);

		cv::Mat yuvImg;

		yuvImg.create(h * 3 / 2, w, CV_8UC1);

		memcpy(yuvImg.data, pYuvBuf, bufLen*sizeof(unsigned char));

		cv::Mat rgbImg;

		cv::cvtColor(yuvImg, rgbImg, CV_YUV2BGR_I420);

		cv::imshow("img", rgbImg);

		char s[100];

		sprintf(s,"%spic%d%s",dir,i,".jpg");

		cv::imwrite(s, rgbImg);

		cv::waitKey(1);

		printf("%d \n", iCount++);

	}

	delete[] pYuvBuf;

	fclose(pFileIn);

}

int main(int argc, char *argv[])

{

	const char *in = "C:/Users/jiang/Desktop/output/outfile.avi";

	const char *out = "C:/Users/jiang/Desktop/output/outfile.yuv";

	const char *dir = "C:/Users/jiang/Desktop/output/tupian1/";

	avi2WriteYuv(in,out);

	DisplayYUVtoRGB(dir,out, 1024, 768);

	return 0;

}