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• Catch refreshing Terminal output in Python

  26 janvier 2019, par Aaroknight

  I have written a python script which converts movies with ffmpeg from anything to h265 (hevc). Works fine so far now and I get catch a terminal output (How can I get terminal output in python ? - Stackoverflow). I already tried this solution as well : Catching Terminal Output in Python - Stackoverflow But none of them is really what I need.

  Current code is following :

  def convert(path):
  
  if os.path.getsize(path) < 500000000:
  
      pass
  
  name = path.split("/")[-1]
  
  os.mkdir(path.replace(name, "hevc/"))
  
  outvid = path.replace(name, "hevc/" + name)
  
  cmd = ["ffmpeg", "-hwaccel", "cuvid", "-i", path, "-c:v", "hevc_nvenc", "-preset",
  
         "slow", "-rc", "vbr_hq", "-max_muxing_queue_size", "1000", "-map", "0", "-map_metadata",
  
         "0", "-map_chapters", "0", "-c:a", "copy", "-c:s", "copy", outvid]
  
  
  
  process = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0]
  
  print(process)

  While ffmpeg is converting something, the bottom terminal line usually actualizes itself every second showing fps, time, etc. See screenshot bottom line.

  

  In Python I just get a static output :

  

  So do you guys have any idea how to catch that refreshing output ?

• Terminal text becomes invisible after terminating subprocess

  21 novembre 2016, par wim

  After terminating an ffmpeg subprocess, the terminal gets messed up - typed characters are invisible ! The input still works in that commands can be executed, but keyboard input is not echoed to the terminal.

  Issuing shell command reset puts everything back to normal (or !reset from within ipython), so a workaround the issue is calling os.system('reset') inside the script.

  Other things I’ve tried : import curses; curses.initscr() before spawning the subprocess and curses.endwin() after termination, which worked somewhat but broke other stuff. Another possibly related issue is that after spawning the child process, the interactive terminal becomes laggy and sometimes fails to capture typed characters.

  The code to spawn the process looks like :

  with open('/tmp/stdout.log', 'w') as o:
  
      with open('/tmp/stderr.log', 'w') as e:
  
          proc = subprocess.Popen([args], stdout=o, stderr=e)

  And later to stop it :

  proc.terminate()
  
  proc.communicate()

  What could be going wrong here ?

• Terminal text becomes invisible after terminating subprocess

  22 mai 2022, par wim

  After terminating an ffmpeg subprocess, the terminal gets messed up - typed characters are invisible ! The input still works in that commands can be executed, but keyboard input is not echoed to the terminal.

  



  Issuing shell command reset puts everything back to normal (or !reset from within ipython), so a workaround the issue is calling os.system('reset') inside the script.

  



  Other things I've tried : import curses; curses.initscr() before spawning the subprocess and curses.endwin() after termination, which worked somewhat but broke other stuff. Another possibly related issue is that after spawning the child process, the interactive terminal becomes laggy and sometimes fails to capture typed characters.

  



  The code to spawn the process looks like :

  



  with open('/tmp/stdout.log', 'w') as o:
    with open('/tmp/stderr.log', 'w') as e:
        proc = subprocess.Popen([args], stdout=o, stderr=e)


  



  And later to stop it :

  



  proc.terminate()
proc.communicate()


  



  What could be going wrong here ?