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• opencv_ffmpeg module crash (IP Camera)

  25 novembre 2016, par Suraksha Ajith

  I’m using IP webcam android app(It converts mobile camera into IP web camera).
  I’m running below code in Visual Studio 2015 with OpenCV 3.1.

  VideoCapture cap; Mat img;
  
  cap.open("http://192.168.0.101:8080/video?x.mjpeg");
  
  while(waitKey(33)!=27)
  
  {
  
      try{
  
          cap>>img;  //code crashes here
  
          if(img.empty())
  
          {
  
           cout<<"camera Closed"<code>

  Getting below error.cIf the internet connection is slow or if the Wi-Fi is disconnected in my android device the program crashes
  Error :

  Exception thrown at 0x0BF2F6F0 (opencv_ffmpeg310.dll) in test.exe :
  0xC0000005 : Access violation reading location 0x00000020.

  If there is a handler for this exception, the program may be safely
  continued.

  even if the code is wrapped within try catch block, it crashes !

  Should I use try {} catch (...) block in source file, if yes, then where should I use this ?
  I referred this link but did not find the right answer.

• python module ffpyplayer showing or displaying video frames to screen

  19 octobre 2016, par user2305443

  Using python module ffpyplayer, How can I see the frames or get the img object to display or show the video image/frames to the screen ?, in the tutorial that I followed, it seems very simple, it reads the frames and plays oudio but (does not display) any video image or frame to the screen, only if I add the (print img, t) will print the frame info to the screen but not video image is displayed on the screen.

  I being following tutorials from : https://pypi.python.org/pypi/ffpyplayer, and here : http://matham.github.io/ffpyplayer/player.html, and searched google but the only relevant results point to the same info, I am somewhat new to programming and python, and so maybe I am missing something that seems to be very simple but I can’t figure it out myself.

  I am using : windows 7 64bit, python 2.7.11 32bit.

  Any Help will be appreciated thank you very much.

  from ffpyplayer.player import MediaPlayer
  
  
  
  vid = 'test_video.flv'
  
  player = MediaPlayer(vid)
  
  val = ''
  
  while val != 'eof':
  
      frame, val = player.get_frame()
  
      if val != 'eof' and frame is not None:
  
          img, t = frame
  
          print img, t     #This prints the image object
  
          # display img    #This does nothing!

• Ubuntu 16.04 python installing 3rd party module ffmpeg-3.0.2

  3 juin 2016, par vanoccupanther

  Have tried installing this package multiple times. Initially I installed it to a directory where I am running scripts that call it but I get an error message "ImportError : No module named ’ffmpeg’".

  I then tried putting it in one of my python paths listed in sys.path and again I got the same message.

  I then opened .bashrc and added the home directory path and still got the same error message when I ran my script.

  import sys
  
  import pandas as pd
  
  import numpy as np
  
  import matplotlib.pyplot as plt
  
  import ffmpeg
  
  
  
  from PIL import Image
  
  
  
  img = sys.argv[1] # ignore this
  
  
  
  im = Image.open(img) # ignore this
  
  imarray = np.array(im) # ignore this
  
  
  
  ffmpeg -i ('flame.avi') -f image2 -c:v mjpeg ('image-%d.jpg')
  
  avconv -i ('flame.avi') -vsync ('1') -r ('100') ('image%03d.tif')

  I’m really not sure where to go, what are my options here ? And what am I doing that is glaringly wrong ?