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• How can I get Python to find ffprobe ?

  4 novembre 2018, par tburrows13

  I have ffmpeg and ffprobe installed on my mac (macOS Sierra), and I have added their path to PATH. I can run them from terminal.

  I am trying to use ffprobe to get the width and height of a video file using the following code :

  import subprocess
  
  import shlex
  
  import json
  
  
  
  
  
  # function to find the resolution of the input video file
  
  def findVideoResolution(pathToInputVideo):
  
      cmd = "ffprobe -v quiet -print_format json -show_streams"
  
      args = shlex.split(cmd)
  
      args.append(pathToInputVideo)
  
      # run the ffprobe process, decode stdout into utf-8 & convert to JSON
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
      ffprobeOutput = json.loads(ffprobeOutput)
  
  
  
      # find height and width
  
      height = ffprobeOutput['streams'][0]['height']
  
      width = ffprobeOutput['streams'][0]['width']
  
  
  
      return height, width
  
  
  
  h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
  print(h, w)

  I am sorry I cannot provide a MCVE, as I didn’t write this code, and I don’t really know how it works.

  It gives the following error :

  Traceback (most recent call last):
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 21, in <module>
  
      h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 12, in findVideoResolution
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 626, in check_output
  
      **kwargs).stdout
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 693, in run
  
      with Popen(*popenargs, **kwargs) as process:
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 947, in __init__
  
      restore_signals, start_new_session)
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 1551, in _execute_child
  
      raise child_exception_type(errno_num, err_msg)
  
  FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe'
  
  </module>

  If python is not reading from the PATH file, how can I specify where ffprobe is ?

  Edit :
  It appears the python path is not aligned with my shell path.
  Using os.environ["PATH"]+=":/the_path/of/ffprobe/dir" at the beginning of each program allows me to use ffprobe, but why might my python path not be the same as my shell path ?

• Apply Loop for Subprocessing Call FFMPEG in Python

  25 novembre 2019, par rayyar

  suppose I have a audio mp3 file with length 00:04:00 (240 seconds). I want to extract parts of said file each within range 2 seconds, so it would be :

  File_01 00:00:00-00:00:02, File_02 00:00:02-00:00:04, File_03 00:00:04-00:00:06 ... File_120 00:03:58-00:04:00.

  I am using python, call module subprocess to run ffmpeg function. What I did, I simply put it in a loop like this :

  count = 0
  
  count2 = 2
  
  count3 = 1
  
  while count2 <= audio_length:
  
      ffmpeg = 'ffmpeg -i input.mp3 -c copy -ss %d -to %d output%d.wav' % (count, count2, count3)
  
      subprocess.call(ffmpeg, shell=True)
  
      count = count + 2
  
      count2 = count2 + 2
  
      count3 = count3 + 1

  However, the subprocess part took a long time and it seems stucked. I’ve searched some insights, but i haven’t found any that mentions about looping. Any help appreciated.

• Python 3 subprocess.popen() doesn't work on linux. Works on windows [closed]

  30 avril 2021, par user2628458

  process = subprocess.Popen(
    cmd, shell=True,
    stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
     universal_newlines=True)
for line in process.stdout:
    # ...


  


  I have this line that executes an FFmpeg job and throws out every line in the output to a variable. It works fine on Windows, but doesn't work at all on Linux. The for loop never gets executed. I can't find anything about this, or the difference between Windows and Linux subprocess.Popen(). Can you please point me the right way to fix this ?