cvCapturefromCAM() returns NULL

Iam using cvCapturefromCAM() to display the camera video. But if some VT(video) call is made, cvCapturefromCAM() is returning N开发者_JAVA百科ULL. according to my analysis it is like, if the camera has already been started , capture will return NULL. so while doing video call, camera has bee started by the videoengine lib. And i donot hav the cvCapture pointer also to release the camera. Please help me how to go about this deadlock..

thanks gayathri devi

I think you have to make a pointer to cvCapturefromCAM() and then after use, release it. That's it.

Like this:

capture = cvCaptureFromCAM(0);

cvReleaseCapture(&capture);

Good Luck!

Make this modification and it should work. I also had this issue before.

CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANY );