opencv 播放视频

看资料 cv播放视频 是用 VideoCapture 。结果始终打不开文件，open(0); 倒是可以打开摄像头。于是抛弃他的c++类，用c 接口来播放。结果ok.

//打开CvCapture *capture=cvCreateFileCapture( "a.avi" );if(!capture){     return -1;}//视频信息 int cam_width= (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH ); int cam_height= (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT ); int fps=(int)cvGetCaptureProperty(capture,CV_CAP_PROP_FPS ); int ex=(int)cvGetCaptureProperty(capture,CV_CAP_PROP_FOURCC );// 获取下一帧IplImage *tm =cvQueryFrame(capture);// 关闭 cvReleaseCapture(&capture);