Use Opencv Open the laptop camera and report an error
Opencv Open the camera and report an error
Use Opencv Open the laptop camera and report an errorIn the near future, we will do a task of sending image data from the lower computer to the upper computer , When debugging, I wrote a client to obtain the camera video data of the laptop and transmit it to the server , Then the server displays the camera video data . Results the client reported an error when running , Video window flash back .
Generally, the code for acquiring camera image data is as follows ：
capture = cv.VideoCapture(0)However, the following errors will be reported during operation ：
[ WARN:0] global C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-52oirelq\opencv\modules\videoio\src\cap_msmf.cpp (677) CvCapture_MSMF::initStream Failed to set mediaType (stream 0, (640x480 @ 30) MFVideoFormat_RGB24(codec not found)
After searching the Internet, I found that as long as the above code is slightly modified
# Create an image reading object capture = cv.VideoCapture(0,cv.CAP_DSHOW) # change API Set up here 0 Represents the camera of the notebook , If there is an external camera, you can select 1、2 etc. .
Opencv Open the camera and report an errorCvCapture_MSMF::initStream Failed to set mediaType (stream 0, (640x480 @ 30)
cap=cv2.VideoCapture(0,cv2.CAP_DSHOW)enum VideoCaptureAPIs { CAP_ANY = 0, //!< Auto detect == 0 CAP_VFW = 200, //!< Video For Windows (obsolete, removed) CAP_V4L = 200, //!< V4L/V4L2 capturing support CAP_V4L2 = CAP_V4L, //!< Same as CAP_V4L CAP_FIREWIRE = 300, //!< IEEE 1394 drivers CAP_FIREWARE = CAP_FIREWIRE, //!< Same value as CAP_FIREWIRE CAP_IEEE1394 = CAP_FIREWIRE, //!< Same value as CAP_FIREWIRE CAP_DC1394 = CAP_FIREWIRE, //!< Same value as CAP_FIREWIRE CAP_CMU1394 = CAP_FIREWIRE, //!< Same value as CAP_FIREWIRE CAP_QT = 500, //!< QuickTime (obsolete, removed) CAP_UNICAP = 600, //!< Unicap drivers (obsolete, removed) CAP_DSHOW = 700, //!< DirectShow (via videoInput) CAP_PVAPI = 800, //!< PvAPI, Prosilica GigE SDK CAP_OPENNI = 900, //!< OpenNI (for Kinect) CAP_OPENNI_ASUS = 910, //!< OpenNI (for Asus Xtion) CAP_ANDROID = 1000, //!< Android - not used CAP_XIAPI = 1100, //!< XIMEA Camera API CAP_AVFOUNDATION = 1200, //!< AVFoundation framework for iOS (OS X Lion will have the same API) CAP_GIGANETIX = 1300, //!< Smartek Giganetix GigEVisionSDK CAP_MSMF = 1400, //!< Microsoft Media Foundation (via videoInput) CAP_WINRT = 1410, //!< Microsoft Windows Runtime using Media Foundation CAP_INTELPERC = 1500, //!< RealSense (former Intel Perceptual Computing SDK) CAP_REALSENSE = 1500, //!< Synonym for CAP_INTELPERC CAP_OPENNI2 = 1600, //!< OpenNI2 (for Kinect) CAP_OPENNI2_ASUS = 1610, //!< OpenNI2 (for Asus Xtion and Occipital Structure sensors) CAP_GPHOTO2 = 1700, //!< gPhoto2 connection CAP_GSTREAMER = 1800, //!< GStreamer CAP_FFMPEG = 1900, //!< Open and record video file or stream using the FFMPEG library CAP_IMAGES = 2000, //!< OpenCV Image Sequence (e.g. img_%02d.jpg) CAP_ARAVIS = 2100, //!< Aravis SDK CAP_OPENCV_MJPEG = 2200, //!< Built-in OpenCV MotionJPEG codec CAP_INTEL_MFX = 2300, //!< Intel MediaSDK CAP_XINE = 2400, //!< XINE engine (Linux) };Attached view camera subscript ：
import cv2ID = 0while(1): cap = cv2.VideoCapture(ID,cv2.CAP_DSHOW) # get a frame ret, frame = cap.read() if ret == False: ID += 1 else: print(ID) breakThe above is personal experience , I hope I can give you a reference , I also hope you can support the software development network .
