OpenCV VideoCapture在大尺寸视频上崩溃

Question

我正在尝试读取大小为2448x2050的原始avi视频。每次我试图读取一个帧时，程序都会因seg错误而崩溃。同样的程序适用于较小尺寸的视频。

以下是一个示例程序：

#include <iostream>
#include <opencv2/opencv.hpp>
int main( int argc, char** argv )
{
    cv::VideoCapture cap(argv[1]);
    if(!cap.isOpened())
        return -1;
    cv::Mat frames;
    cv::namedWindow("Window", CV_WINDOW_NORMAL);
    for(;;)
    {
        // error here
        cap >> frames;
        // ........
        cv::imshow("Window", frames);
        cv::waitKey(33);
    }
    return 0;
}

以下是valgrind的输出：

==30166== Invalid read of size 1
==30166==    at 0x9ECD550: sws_convertPalette8ToPacked24 (in /usr/lib/x86_64-linux-gnu/libswscale.so.2.1.1)
==30166==    by 0x9ED13AA: ??? (in /usr/lib/x86_64-linux-gnu/libswscale.so.2.1.1)
==30166==    by 0x9ED385A: sws_scale (in /usr/lib/x86_64-linux-gnu/libswscale.so.2.1.1)
==30166==    by 0x4E5066D: CvCapture_FFMPEG::retrieveFrame(int, unsigned char**, int*, int*, int*, int*) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E5071A: cvRetrieveFrame_FFMPEG (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4FB88: CvCapture_FFMPEG_proxy::retrieveFrame(int) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E4BA: cv::VideoCapture::retrieve(cv::Mat&, int) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E2A6: cv::VideoCapture::read(cv::Mat&) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E209: cv::VideoCapture::operator>>(cv::Mat&) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x401330: main (in /home/rumman/temp/Video)
==30166==  Address 0x18897a10 is 5,015,952 bytes inside a block of size 5,018,408 free'd
==30166==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==30166==    by 0x8CD0113: av_destruct_packet (in /usr/lib/x86_64-linux-gnu/libavcodec.so.54.35.0)
==30166==    by 0x8CD04B3: av_free_packet (in /usr/lib/x86_64-linux-gnu/libavcodec.so.54.35.0)
==30166==    by 0x4E50BB8: CvCapture_FFMPEG::grabFrame() (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E50C38: cvGrabFrame_FFMPEG (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4F934: CvCapture_FFMPEG_proxy::grabFrame() (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E450: cvGrabFrame (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E46C: cv::VideoCapture::grab() (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E241: cv::VideoCapture::read(cv::Mat&) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x4E4E209: cv::VideoCapture::operator>>(cv::Mat&) (in /usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.8)
==30166==    by 0x401330: main (in /home/rumman/temp/Video)

Answer 1

发现问题只发生在使用原始视频时，与视频分辨率无关。

修补程序可以在这里找到。