最后突然想到去github bug反馈那边搜了一下,还真让我搜到一丝线索,说是调用VideoCapture打开媒体文件时如果第二个参数传入cv::CAP_MSMF(capture.open(0, cv::CAP_MSMF))就有可能出现这种问题。这是该Bug链接VideoCapture fails to get frame if I use msmf and mp4 has audio stream,有兴趣可以了解下。 回头...
const cap = new cv.VideoCapture('./roadtest1.mp4'); // Error: VideoCapture::New - failed to open capture I get the same results with an RTSP stream as well. This is on version 4.5.1 (autobuilt) on a fresh Ubuntu install, the only things ...
Dear all, I have just downloaded and installed Release 4.5 in my Ubuntu 20.04LTS successfully. I activated -DFFMEG=ON too. In my C++ program, I usually use this code VideoCapture capture; capture.open("/home/user/myvideo.avi"); if(!capture.isOpened()) std::cout << "no capture" <<...
std::string path = "xxxpath"; cv::VideoCapture * m_Cap = new cv::VideoCapture(path); if (m_Cap) { std::cout << "video: " << path << " is opened !" << std::endl; } else { std::cout << "video: " << path << " opened failed !" << std::endl; } if( !m_Cap-...
retval, buffer_img = cv2.imencode('.jpg', frame)cv2.error: OpenCV(4.1.2) /io/opencv/modules/imgcodecs/src/loadsave.cpp:877:error: (-215:Assertion failed) !image.empty()infunction'imencode' cap = cv2.VideoCapture(0)# here it throws an errorimportjsonwhile(True):# Capture frame-by-...
读取视频文件 #include<opencv2/opencv.hpp> #include<iostream> int main(int argc, char** argv) { cv::VideoCapture capture("D:/bb/tu/aa.avi&qu
flag =false; }//视频释放capture.release();#endifstd::stringpath ="xxxpath"; cv::VideoCapture * m_Cap = new cv::VideoCapture(path);if(m_Cap) {std::cout<<"video: "<< path <<" is opened !"<<std::endl; }else{std::cout<<"video: "<< path <<" opened failed !"<<std::endl...
import cv2 cap = cv2.VideoCapture(0) if not cap.isOpened(): print("Cannot open camera") exit() while True: ret, frame = cap.read() if not ret: print("no stream!") break cv2.imshow('frame', frame) if cv2.waitKey(1) == ord('q'): bre...
cam = cv2.VideoCapture("v4l2src device=/dev/video0 ! video/x-raw,format=YUY2,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw, format=BGR ! appsink drop=1 ", cv2.CAP_GSTREAMER) if not cam.isOpened() : print("Failed to open camera") ...
opencvVideoCapture.read（）读取错误 错误详情:OpenCV Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow, file ..\..\..\..\opencv\modules\highgui\src\window.cpp, line 261 源码:import cv2 as cv clicked = False def onMouse(event,x,y,flags,param):global clicked if ...