Hi all:
my platform is win10 64bits+vs2017+opencv3.4.1
i use VideoCapture read frame in from camera and save frame as .png file .
that's ok.
but how can i read frame in then save frame as .yuv file(422)?
i have try code but show
"OpenCV: FFMPEG: tag 0x30323449/'I420' is not supported with codec id 14 and format 'rawvideo / raw video' VideoWriter has created."
is FFMPEG codec wrong or my code got problem?my code as below
many many thanks for you read it.
include "opencv/cv.h"
include "opencv/highgui.h"
include "opencv2/opencv.hpp"
include <iostream>
using namespace std; using namespace cv;
CvVideoWriter* video = NULL; FILE* pFile;
IplImage* RgbToYUV420(IplImage* pImage) {
cout << "width:" << pImage->width << " height:" << pImage->height << endl;
int width = pImage->width;
int height = pImage->height;
int yuvSize = width * height * 3 / 2;
char* pRgbBuf = pImage->imageData;
char* pYBuf, *pUBuf, *pVBuf;
char* pYUVBuf;
pYUVBuf = (char*)malloc(yuvSize);
pYBuf = pYUVBuf;
memset(pYBuf, 0, yuvSize);
pUBuf = pYBuf + width * height;
pVBuf = pUBuf + width * height / 4;
unsigned char r, g, b;
unsigned char y, u, v;
for (int i = 0; i < height; i++)
for (int j = 0; j < width; j++)
{
b = *(pRgbBuf);
g = *(pRgbBuf + 1);
r = *(pRgbBuf + 2);
y = (unsigned char)( 0.299* r + 0.587* g + 0.114 * b );
u = (unsigned char)( -0.169 * r - 0.332 * g + 0.500 * b + 128);
v = (unsigned char)( 0.500 * r +0.419 * g - 0.0813 * b + 128);
if (y > 255)y = 255;
else if (y < 0)y = 0;
if (u > 255)u = 255;
else if (u < 0)u = 0;
if (v > 255)v = 255;
else if (v < 0)v = 0;
*(pYBuf++) = y;
pRgbBuf += 3;
if (i % 2 == 0 && j % 2 == 0)
{
*(pVBuf++) = v;
*(pUBuf++) = u;
}
}
fwrite(pYUVBuf, 1, yuvSize, pFile);
pImage->dataOrder=1;*/
return pImage;
}
int main(int argc, char* argv) { CvCapture capture = 0; IplImage* frame = 0; int frameWidth = 640; int frameHeight = 480; capture = cvCaptureFromCAM(1); video = cvCreateVideoWriter("out.yuv", CV_FOURCC('I', '4', '2', '0'), 25, cvSize(frameWidth, frameHeight)); if (video) { cout << "VideoWriter has created." << endl; } fopen_s(&pFile, "yuvvideo.yuv", "wb"); int fps = 25; //double fps = cvGetCaptureProperty(capture,CV_CAP_PROP_FPS);
CvVideoWriter* writer = 0;
int isColol = 1;
int frameW = 320;
int frameH = 240;
int n = 1;
writer = cvCreateVideoWriter("out.avi", CV_FOURCC('M', 'P', '4', '2'), fps, cvSize(frameW, frameH), isColol);
cvNamedWindow("webcam", 1);
//for(int i=0;i<50;i++) //2秒
for (;;)
{
frame = cvQueryFrame(capture);
cvWriteFrame(writer, frame);
cvShowImage("webcam", frame);
frame = RgbToYUV420(frame);
n = cvWriteFrame(video, frame);
CAP_PROP_CONVERT_RGB
cvWaitKey(1000 / fps);
}
cvReleaseVideoWriter(&writer);
cvReleaseImage(&frame);
cvReleaseCapture(&capture);
cvDestroyWindow("webcam");
return 0;
}
