C++ 无法在OpenCV中创建/保存输出avi文件

我有以下检测BLOB的源代码，我使用的是MS2008，OpenVC2.1

#include "stdafx.h"

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <stdlib.h>
using namespace std;

/*You may change the values of the sthreshold and hlower and hupper to get different results....*/
const int sthreshold=210;
const double hlower=178;
const double hupper=3;
int main(int argc, char* argv[]) {

    int i,j,k;//for iterations
    int height,width,step,channels;/*HSV means the frame after color conversion*/
    int heightmono,widthmono,stepmono,channelsmono;/*mono means the frame which has the monochrome image*/
    const char string1[]="monoimg.avi";/*This is the name of the video which would be the outcome of the blob detection program..*/
    uchar *data,*datamono;


    i=j=k=0;

    IplImage *frame = 0;

    int key = 0;/*Initializing the capture from the video...*/

    CvCapture* capture = cvCreateFileCapture( "partofvideo3.avi" );

    double fps = cvGetCaptureProperty (/*getting the capture properties......the frame rate..*/
    capture,CV_CAP_PROP_FPS);

    CvSize size = cvSize(
    (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH),
    (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT)
    );

    CvVideoWriter *writer=cvCreateVideoWriter(string1, CV_FOURCC('D', 'I', 'V', 'X') ,fps,size) ;


    if(writer !=NULL)
        printf("Loaded\n");
    else
        printf("Not Loaded\n");
    /* always check */

    if (!capture) {
    fprintf (stderr, "Cannot open video file!\n");
    return(1);
    }


    height = frame->height;
    width = frame->width;
    step = frame->widthStep;
    channels = frame->nChannels;
    data = (uchar *)frame->imageData;

    cvNamedWindow("monoimage", CV_WINDOW_AUTOSIZE);
    cvNamedWindow("original frame", CV_WINDOW_AUTOSIZE);
        for (;;) {/*keep looping till we are out of frames...*/
    if (!cvGrabFrame(capture)) {
    break;
    }

    frame = cvRetrieveFrame(capture);
    IplImage *colimgbot = cvCreateImage( cvGetSize(frame), 8, 3 );
    IplImage *monoimgbot = cvCreateImage( cvGetSize(frame), 8, 1 );
    cvCvtColor(frame,frame,CV_RGB2HSV);

    for(i=0;i< (height);i++)
        {
            for(j=0;j<(width);j++)
            {
            if((data[(height-i)*step+j*channels]<=hlower) && (data[(height-i)*step+j*channels]>=hupper))
                {
                    if((data[(height-i)*step+j*(channels)+1])>sthreshold)
                            /*"height-i" because if we use only "i" we were getting vertically inverted result...hence reinverting the same
                            would do the required....*/
                            datamono[i*stepmono+j*channelsmono]=255;
                        else    
                            datamono[i*stepmono+j*channelsmono]=0;}
                        else datamono[i*stepmono+j*channelsmono]=0;
                }
            }
        cvErode(monoimgbot,monoimgbot,0,14);
        cvDilate( monoimgbot,monoimgbot,0,15);
        cvWriteFrame(writer, monoimgbot);
        cvShowImage("original frame", frame);
        cvShowImage("monoimage", monoimgbot);

        if( (cvWaitKey(10) & 255) == 27 ) break;

        }

    cvReleaseVideoWriter(&writer) ;

    cvDestroyWindow("monoimage");

    cvReleaseCapture(&capture);


    return 0;
}

输出#0，avi，到'monoimg.avi'： 流#0.0：视频mgeg4，yuv420p，q=2-3190K tbn [mpeg4@0x37e5c0]未设置帧速率 OpenCV错误：未知函数、文件中的参数错误（无法打开编解码器“mpeg 4”：未指定错误）

---

C:\User\VP\ocv\opencv\src\highgui\cvcap\u ffmpeg.cpp，第1306行

第一步getCaptureProperties在实际获取任何东西时有点差劲，因此您应该检查fps是否确实具有您认为的功能。有些编解码器无法在特定的帧速率下进行编码，所以请尝试将fps显式设置为30，然后看看它是否有效

否则，您将丢失它所说的mpeg 4编解码器。我建议：

1.）下载一些编解码器，然后重试。 可能有你想要的东西

2.）您可以更改

CvVideoWriter *writer=cvCreateVideoWriter(string1, CV_FOURCC('D', 'I', 'V', 'X') ,fps,size) ;

行以使用其他编解码器。我使用了两个编解码器，并将编码7分钟视频的时间放在了我的系统上

   (\P,\I,\M,\1) ;= MPEG-1 codec      (112913.386195 msecs) (104 MB)
   (\M,\J,\P,\G) ;= motion-jpeg codec (crashed)                                        
   (\M,\P,\4,\2) ;= MPEG-4.2 codec    (107184.186774 msecs) (82 MB)
   (\D,\I,\V,\3) ;= MPEG-4.3 codec    (118308.933328 msecs)  (83 MB)
   (\D,\I,\V,\X) ;= MPEG-4 codec      (99037.738131 msecs)  (85 MB)  
   (\U,\2,\6,\3) ;= H263 codec        (101141.993551 msecs) (89 MB) 
   (\I,\2,\6,\3) ;= H263I codec       (crashed) 
   (\F,\L,\V,\1) ;= FLV1 codec        (104307.567802 msecs) (93 MB) 

特别是我建议尝试FLV1编解码器，因为我在这方面很幸运。因此，总之，尝试：

CvVideoWriter *writer=cvCreateVideoWriter(string1, CV_FOURCC('F', 'L', 'V', '1') ,fps,size) ;

---

祝你好运

我已经安装了DIVX编解码器包，我尝试将fps手动设置为30，同时我也尝试了FLV1，但这次我得到以下错误输出#0，avi，到'monoimg.avi'：Stream#0.0:Video:flv，yuv420p，q=2-31，90k tbn，50 tbc编译器没有对齐堆栈变量。Libavcodec编写错误，可能非常慢或崩溃。这不是libavcodec中的错误，而是编译器中的错误。您可以尝试使用gcc>=4.2重新编译。不要向FFmpeg开发人员报告崩溃。图片大小无效（0x0）最后一条消息重复2次avi@0x37bfd0]维度未设置fps为30在osx opencv2.2和MPEG-4编解码器中手动为我工作请帮我回答这个问题好吗

CvVideoWriter *writer=cvCreateVideoWriter(string1, CV_FOURCC('F', 'L', 'V', '1') ,fps,size) ;