无效的参数 munmap：无效的参数 problem with libv4l2 - 服务报错
我今天写了个测试程序，在linux下坐测试，发现这句话执行时会报这样的提示，但依旧能正常预览视频，我很奇怪！虽说能运行，但下到板子里就不行了。请高人提示下，我的测试代码：
#include <stdio.h>
#include <cv.h>
#include <highgui.h>
int main()
{
//声明IplImage指针
IplImage* pFrame = NULL;
printf("IplImage oK\n");
//获取摄像头
CvCapture* pCapture = cvCreateCameraCapture(-1);
printf("cvCreateCameraCapture OK!\n");
//创建窗口
cvNamedWindow("video", 1);
printf("cvNamedwindow OK!\n");
//显示视屏
while(1)
{
pFrame=cvQueryFrame( pCapture );
printf("first frame\n");
if(!pFrame)
{
printf("fail to cvQueryFrame!\n");
break;
}
cvShowImage("video",pFrame);
char c=cvWaitKey(33);
if(c==27)break;
}
cvReleaseCapture(&pCapture);
cvReleaseImage(&pFrame);
cvDestroyWindow("video");
}
用gcc编译器之后，运行结果如下：
IplImage oK
mmap: Invalid argument
munmap: Invalid argument
munmap: Invalid argument
munmap: Invalid argument
munmap: Invalid argument
Unable to stop the stream.: Bad file descriptor
munmap: Invalid argument
munmap: Invalid argument
munmap: Invalid argument
munmap: Invalid argument
cvCreateCameraCapture OK!
cvNamedwindow OK!
后面的都好好的。。。。 渴望您的指点
写回答
-
zhe这难道是opencv的一个bug？？？######
我在google上得到：
problem with libv4l2
Hi,I've looked for some post with my problem but I haven't found.I have started to use opencv with Harpia without problems. Today, I have decided to install the latestversion of opencv.After the installation, I've re-compile my source and I've encountered this error:"...(software runs correctly)...mmap: Invalid argumentmunmap: Invalid argumentmunmap: Invalid argumentmunmap: Invalid argumentmunmap: Invalid argumentUnable to stop the stream.: Bad file descriptormunmap: Invalid argumentmunmap: Invalid argumentmunmap: Invalid argumentmunmap: Invalid argumentlibv4l2: error converting / decoding frame data: v4l-convert: error parsing JPEG header: Not a JPG file ?HIGHGUI ERROR: V4L: Could not SYNC to video stream. Input/output error...(software runs correctly)Segmentation fault"The error is generated by this code:ImgCap = cvCaptureFromCAM(0);if(!cvGrabFrame(ImgCap))printf("Cannot Grab Image from camera 1");ImgFr1 = cvRetrieveFrame( ImgCap ,0);and I think that it depends on "static IplImage* icvRetrieveFrameCAM_V4L( CvCaptureCAM_V4L* capture,int)" of cvcap_v4l.cppSomeone knows the solution of my problem?I've tried with Opencv 2.0 and 2.1, with a philips spc1300nc and the integrated laptop camera.Same error, while the harpia opencv run correctly.Thanks------------------------------------Change settings: http://www.yahoogroups.com/mygroups, selectGet Emails (get all posts)Daily Digest (one summary email per day)Read on the web (read posts on the web only)Or Unsubscribe by mailing OpenCV-unsubscribe <at> yahoogroups.com
######和我的问题一样啊！！！！######http://ubuntuforums.org/showthread.php?t=1453004 这个人的问题也和我一样2020-05-29 21:15:45赞同 展开评论 打赏
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