c - 在 OpenCV 中读取 AVI 文件时出现未知错误

Question

每当我尝试读取 avi 文件并在 Windows XP 中使用 Opencv 2.1 和 VS 2008 转换为灰度时

我不明白为什么我会同时收到以下运行时错误，但我无法获得有关它的帮助

错误 1

[NULL @ 0x37da10]Invalid and inefficient vfw-avi packed B frames detected fps=23 frame (w, h) = (640, 272) Output #0, avi, to 'test.avi': Stream #0.0: Video: mpeg4, yuv420p, 640x272, q=2-31, 11141 kb/s, 90k tbn, 23 .98 tbc [mpeg4 @ 0x37f920]removing common factors from framerate [mpeg4 @ 0x37da10]Invalid and inefficient vfw-avi packed B frames detected Compiler did not align stack variables. Libavcodec has been miscompiled and may be very slow or crash. This is not a bug in libavcodec, but in the compiler. You may try recompiling using gcc >= 4.2. Do not report crashes to FFmpeg developers. [mpeg4 @ 0x37da10]Invalid and inefficient vfw-avi packed B frames detected

如果我尝试其他 avi 文件，则会出现以下运行时错误

错误2

fps=15 frame (w, h) = (176, 184) Output #0, avi, to 'demo.avi': Stream #0.0: Video: mpeg4, yuv420p, 176x184, q=2-31, 2072 kb/s, 90k tbn, 15 tbc Compiler did not align stack variables. Libavcodec has been miscompiled and may be very slow or crash. This is not a bug in libavcodec, but in the compiler. You may try recompiling using gcc >= 4.2. Do not report crashes to FFmpeg developers.

我真的不知道这是怎么回事，这是我学习 OpenCV 的代码，

// VideoCon.cpp : Defines the entry point for the console application.


#include "stdafx.h"


#include <cv.h>
#include <highgui.h>
#include <stdio.h>



int main( int argc, char* argv[] ) {
    cvNamedWindow( "Example2_10", CV_WINDOW_AUTOSIZE );
    cvNamedWindow( "Log_Polar", CV_WINDOW_AUTOSIZE );
    CvCapture* capture = cvCreateFileCapture( "Rambo.avi" );
    if (!capture){
        return -1;
    }
    IplImage* bgr_frame;
    double fps = cvGetCaptureProperty (
        capture,
        CV_CAP_PROP_FPS
    );
 printf("fps=%d\n",(int)fps);

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

    printf("frame (w, h) = (%d, %d)\n",size.width,size.height);
    #ifndef NOWRITE
   CvVideoWriter* writer = cvCreateVideoWriter(  
   // On linux Will only work if you've installed     ffmpeg development files correctly, 
       "test.avi",                               
    // otherwise segmentation fault.  Windows probably better.
        CV_FOURCC('D','X','5','0'),    
        fps,
        size
    );
#endif
    IplImage* logpolar_frame = cvCreateImage(
        size,
        IPL_DEPTH_8U,
        3
    );

    IplImage* gray_frame = cvCreateImage(
        size,
        IPL_DEPTH_8U,
        1
    );

    while( (bgr_frame=cvQueryFrame(capture)) != NULL ) {
        cvShowImage( "Example2_10", bgr_frame );
        cvConvertImage(   //We never make use of this gray image
            bgr_frame,
            gray_frame,
            CV_RGB2GRAY
        );
        cvLogPolar( bgr_frame, logpolar_frame,  
           //This is just a fun conversion the mimic's the human visual system
                    cvPoint2D32f(bgr_frame->width/2,
                    bgr_frame->height/2), 
                    40, 
                    CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS );
        cvShowImage( "Log_Polar", logpolar_frame );
        //Sigh, on linux, depending on your ffmpeg, this often won't work ...
#ifndef NOWRITE
       cvWriteToAVI( writer, logpolar_frame );
#endif
        char c = cvWaitKey(10);
        if( c == 27 ) break;
    }
#ifndef NOWRITE
    cvReleaseVideoWriter( &writer );
#endif
    cvReleaseImage( &gray_frame );
    cvReleaseImage( &logpolar_frame );
    cvReleaseCapture( &capture );
}

Answer 1

我的猜测是您的计算机上没有安装正确的编解码器。尝试安装一些合适的编解码器。