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• avdevice/x11grab : fix cursor drawing in multi-screen setup

  8 septembre 2014, par Antonio Ospite

  avdevice/x11grab : fix cursor drawing in multi-screen setup
  The code uses XFixes to retrieve the cursor coordinates, but XFixes
  
  gives no information of what screen the pointer is on ; this results in
  
  always drawing the cursor on the captured screen even if the mouse
  
  pointer was on another screen.
  For example, when capturing from screen 1 (i.e. -f x11grab -i ":0.1")
  
  the cursor was being drawn in the captured image even when the mouse
  
  pointer was actually on screen 0, which is wrong and visually confusing.
  Use XQueryPointer to check that the pointer is actually on the screen
  
  which is being captured.
  Signed-off-by : Antonio Ospite <ao2@ao2.it>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavdevice/x11grab.c

• How to install ffmpeg in xampp with php 7.0.13 on windows 7 64 bit ?

  25 janvier 2017, par Monik Dabheliya

  I am using xampp and windows 7 (64bit) and PHP Version 7.0.13

  I do all steps copy php_ffmpeg.dll file in ext folder & Other files in system32 folder & also i paste Other files in sysWOW64 folder.

  Add extenstion in php.ini file.

  And restart the xampp.

  It not worked for me on PHP 7.0.13

• OpenCV cv2 not working in Windows 7

  6 septembre 2014, par Subhendu Sinha Chaudhuri

  I have a Windows 7 SP1 64 Bit machine with open cv2.4.9 installed and python 2.7.6 installed.
  I use pre compiled version of opencv

  The following code works perfectly for me

  import cv2.cv as cv
  
  import time
  
  
  
  cv.NamedWindow("camera", 0)
  
  
  
  capture = cv.CaptureFromCAM(0)
  
  
  
  while True:
  
      img = cv.QueryFrame(capture)
  
      cv.ShowImage("camera", img)
  
      if cv.WaitKey(10) == 27:
  
          break
  
  cv.DestroyAllWindows()

  Now when I try to use this code

  import cv2
  
  import numpy as np
  
  cam = cv2.VideoCapture(0)
  
  s, img = cam.read()
  
  
  
  winName = "Movement Indicator"
  
  cv2.namedWindow(winName, cv2.CV_WINDOW_AUTOSIZE)
  
  
  
  while s:
  
    cv2.imshow( winName,img )
  
  
  
    s, img = cam.read()
  
  
  
    key = cv2.waitKey(10)
  
    if key == 27:
  
      cv2.destroyWindow(winName)
  
      break
  
  
  
  print "Goodbye"

  The window is opened , the camera is initialized (as camera lights are on) , but nothing is displayed and the window closes and the program exits.

  WHERE am I going wrong ??

  QUESTION 2
  Can any one also suggest me how to capture live video stream from my Linux machine 192.168.1.3 . The stream is being generated by ffmpeg.

  The video stream can be opened in web browser. But I want to capture it with opencv and python.