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• Can not open video in OpenCV and all solution on stacjoverflow is not working with me

  19 mai 2017, par Abeer Yosef

  I am trying to open video in openCV but it is not working i found solutions by adding full path i.e "D :/Folder1/Folder2/1.avi", converting video to .avi instead of mp4, copy the dll file from open cv to python folder after changing it is name by opencv version and windows 64 bit ffmpeg opencv_ffmpeg320_64.dll
  my opencv version 3.2.0
  windows 64
  python2.7 and Anaconda2

  I am beginner in Python and unfortunately nothing of the above solved my problem.

  below my code snappit

  import numpy as np

  import cv2

  cap = cv2.VideoCapture(’1.avi’)
  if cap.isOpened() :
  print "opend"
  else :
  print "not opend"

  while(cap.isOpened()) :
  ret, frame = cap.read()

  gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
  
  
  cv2.imshow('frame',gray)
  
  if cv2.waitKey(1) & 0xFF == ord('q'):
  
      break

  cap.release()
  cv2.destroyAllWindows()

• How to open&save a video file in python ?

  27 août 2014, par AliGH

  I’ve just started to make a ubuntu application using PyGtk. My very first object is to open, convert and then save a video file. Ignoring convert phase, I’m going to implant open-save functions. But at the moment when I open a video file, and save it, I get non-video file with 11B size. I’ve just google this and found OpenCV for python. But I’m not sure if it’s the best way to do it. I also think I’m going to use ffmpeg libraries to do some manipulates on video files. Is it what I want or there might be other built-in libraries ?

  By the way, here’s my code to open and save the file :

      def on_openFile_clicked(self, widget):
  
          filename=None
  
          dialog = Gtk.FileChooserDialog("Please choose a file", self,
  
              Gtk.FileChooserAction.OPEN,
  
              (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
  
               Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
  
  
  
          response = dialog.run()
  
          self.add_filters(dialog)
  
  
  
          if response == Gtk.ResponseType.OK:
  
              filename = dialog.get_filename()
  
          elif response == Gtk.ResponseType.CANCEL:
  
              print 'Cancel Clicked'
  
          dialog.destroy()
  
  
  
          print "File Choosen: ", filename
  
  
  
      def add_filters(self, dialog):
  
  
  
          filter_py = Gtk.FileFilter()
  
          filter_py.set_name("Video Files")
  
          filter_py.add_mime_type("video/mp4")
  
          filter_py.add_mime_type("video/x-flv")
  
          dialog.add_filter(filter_py)
  
  
  
          filter_any = Gtk.FileFilter()
  
          filter_any.set_name("Any files")
  
          filter_any.add_pattern("*")
  
          dialog.add_filter(filter_any)
  
  
  
      def on_saveFile_clicked(self, widget):
  
          filename=None
  
          dialog = Gtk.FileChooserDialog("Please choose a file", self,
  
              Gtk.FileChooserAction.SAVE,
  
              (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
  
               Gtk.STOCK_SAVE, Gtk.ResponseType.OK))
  
  
  
          response = dialog.run()
  
          self.add_filters(dialog)
  
  
  
          if response == Gtk.ResponseType.OK:
  
              filename = dialog.get_filename()
  
          elif response == Gtk.ResponseType.CANCEL:
  
              print 'Cancel Clicked'
  
          dialog.destroy()
  
  
  
          if filename != None:
  
              save_file=open(filename, 'w')
  
              save_file.write("Sample Data")
  
              save_file.close()
  
          print "File Saved: ", filename

• FFmpeg : How to open a file with an apostrophe in its name ?

  5 février 2020, par EmielBoss

  I am trying to concatenate a bunch of audio files with the following command :

  ffmpeg -f concat -safe 0 -i Filelist.txt -c copy out.mp3

  Unfortunately, one of my audio files has an apostrophe in its name, which are used to indicate the start and end of the filename :

  file 'Murfy's in Trouble!.mp3'

  giving the following error :

                              Impossible to open 'Murfy%s'
  
  Filelist.txt: No such file or directory

  I tried escaping it with \ and %, but those don’t work. Is there any way around this without changing all my filenames ?