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• Running a 2-pass video conversion using Python's subprocess module and ffmpeg

  22 novembre 2012, par ensnare

  I'm trying to convert a bunch of videos to play on my iPad. I'm using the subprocess module, which from what I understand launches a binary in a separate process from my script. I'm not sure how to handle 2-pass encoding which requires that the first process terminate before the second begin.

  Here is my code :

  def convert(filename):
  
    extension = filename[-3:]
  
  
  
    destination_filename_720 = filename[-4:] + '-a720p' + '.mp4'
  
    destination_filename_1080 = filename[-4:] + '-a1080p' + '.mp4'
  
  
  
    p = subprocess.Popen(['ffmpeg','-i', str(filename) ,
  
                          '-acodec' , 'aac' ,
  
                          '-ab' , '160k' ,
  
                          '-ac' , '2' ,
  
                          '-vcodec' , 'libx264' ,
  
                          '-strict' , '-2' ,
  
                          '-vpre' , 'ipod640' ,
  
                          '-threads' , '8' ,
  
                          '-s' , '1280x720' ,
  
                          '-b:v' , '2000k' ,
  
                          '-pass' , '1' ,
  
                          '-y' ,
  
                          destination_filename_720])
  
  
  
    p = subprocess.Popen(['ffmpeg','-i', str(filename) ,
  
                          '-acodec' , 'aac' ,
  
                          '-ab' , '160k' ,
  
                          '-ac' , '2' ,
  
                          '-vcodec' , 'libx264' ,
  
                          '-strict' , '-2' ,
  
                          '-vpre' , 'ipod640' ,
  
                          '-threads' , '8' ,
  
                          '-s' , '1280x720' ,
  
                          '-b:v' , '2000k' ,
  
                          '-pass' , '2' ,
  
                          '-y' ,
  
                          destination_filename_720])

  As soon as the convert() function is called, both processes are spawned immediately.

  The second process fails because the first process hasn't yet finished.

  How can I fix this ? Or, is there a better way ?

• Updated the AMD module requirements.

  12 juin 2013, par blueimp

  Updated the AMD module requirements.

• Refactored Angular module.

  13 juin 2013, par blueimp

  Refactored Angular module.
  Renamed fileupload directive to fileUpload (file-upload in templates)
  
  for consistency with the service and controllers.
  
  Preview and Progress directives now use "file-upload-" as prefix as a
  
  sort of namespace.
  
  The formatFileSizeFilter now accepts suffix and prefix for the units.
  
  This allows better localizing for languages which put the unit label
  
  first.