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• ffmpeg, -shortest does not work when overlaying PNG sequence on a still

  27 août 2014, par Aviator Addis

  How do you make this work ?

  ffmpeg -loop 1 -i emma.jpg -r 29.97 -i source\source_%%05d.png -filter_complex overlay -r 29.97 -pix_fmt yuv420p -y -shortest sample_source.mp4

  It seems the -shortest option does not work and it just keeps encoding with no stop on the last frame. I’m using the latest static 8-27-2014 64 bit build on windows 8.1 If I assigned -t value it will stop at the specified length, but I need it’s output length set to whatever the sequence might happen to be (at it will vary).

• I have pip installed pydub but still didn't work

  1er mai 2023, par Dom807

  After I had pip installed pydub and SpeechRecognition, I still can't make the program run successfully although I extracted the files from ffmpeg and specified the folder name bin in the corresponding directory. I tried to find solutions to solve the problem but it sill didn't work after I followed the steps clearly from the web. May I ask what is the good way to read .wav files using pydub AudioSegment ?

  


    Warning (from warnings module):
      File "C:\Python38\lib\site-packages\pydub\utils.py", line 171
        warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
    RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work


  


• 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.