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• Cannot run ffmpeg in subproces.call

  27 juin 2012, par Richard Knop

  So, I have a simple class where I am trying to save a string response from a terminal ffmpeg command into an object property :

  import os
  
  import subprocess
  
  
  
  class Movie(object):
  
  
  
      absolute_path = None
  
      movie_info = None
  
  
  
      def __init__(self, path):
  
          self.absolute_path = "%s/%s" % (os.getcwd(), path)
  
          if(os.path.exists(self.absolute_path) is False):
  
              raise IOError("File does not exist")
  
  
  
      def get_movie_info(self):
  
          ffmpeg_command = "ffmpeg -i %s" % self.absolute_path
  
          self.movie_info = subprocess.call(ffmpeg_command)
  
          print self.movie_info

  When I then run this command in cmd :

  import os
  
  import sys
  
  sys.path.append(os.getcwd())
  
  
  
  from Encode.Movie import Movie
  
  
  
  try:
  
      movie = Movie("tests/test_1.mpg")
  
      movie.get_movie_info()
  
  except IOError as e:
  
      print e

  I get this exception :

  richard@richard-desktop:~/projects/hello-python$ python main.py 
  
  Traceback (most recent call last):
  
    File "main.py", line 9, in <module>
  
      movie.get_movie_info()
  
    File "/home/richard/projects/hello-python/Encode/Movie.py", line 16, in get_movie_info
  
      self.movie_info = subprocess.call(ffmpeg_command)
  
    File "/usr/lib/python2.7/subprocess.py", line 493, in call
  
      return Popen(*popenargs, **kwargs).wait()
  
    File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
  
      errread, errwrite)
  
    File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
  
      raise child_exception
  
  OSError: [Errno 2] No such file or directory
  
  </module>

  The path is correct because when I do print self.absolute_path before subprocess.call(), I get :

  /home/richard/projects/hello-python/tests/test_1.mpg

  And this file exists.

• How to mock an .mpg file for unit tests ?

  28 juin 2012, par Richard Knop

  Ok. I have a class which runs this command :

  ffmpeg_command = "ffprobe -v quiet -print_format json -show_format -show_streams %s" % self.absolute_path

  Where self.absolute_path is a path to a movie, let's say .mpg file.

  The file I am using for testing is 4GB large and I don't want to commit it inside my GIT repo.

  So I was thinking of mocking this file and creating a file called :

  mock.mpg

  Which would return the same string as the actual mpg movie when supplied as input to ffprobe command. Is that possible ?

  Or what other approach should I choose ?

  This is my class :

    class Movie(object):
  
  
  
        absolute_path = None
  
        info = None
  
  
  
        def __init__(self, path):
  
            self.absolute_path = "%s/%s" % (os.getcwd(), path)
  
            if(os.path.exists(self.absolute_path) is False):
  
                raise IOError("File does not exist")
  
  
  
            self.info = json.loads(self.get_info())
  
  
  
      def get_info(self):
  
            ffmpeg_command = "ffprobe -v quiet -print_format json -show_format -show_streams %s" % self.absolute_path
  
            return subprocess.check_output(ffmpeg_command, shell=True)

  This is how I will be unit testing it :

    class MovieTest(unittest.TestCase):
  
  
  
        def test_foo(self):
  
            movie = Movie("tests/test_1.mpg") # this file should be a mock file!!!

• C# Adding generic text to a video file

  14 juillet 2016, par Ozan Ayten

  I would like to add a Generics Text (like the texts you see when a movie ends, it slides down or up in a slow pace) to a video file. Hardsubbed.

  I’ve been experimented with few api but couldn’t manage to find a solution. Is this possible ? Is there a way to do it without the task getting too complicated ?

  As a side note : I want to add generic text like the Windows Movie Maker does. But I want to do it programmatically of course.