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• ffmpeg fails with : Unable to find a suitable output format for 'pipe :'

  28 octobre 2022, par user3542055

  I am trying to record my desktop and save it as videos but ffmpeg fails.

  



  Here is the terminal output :

  



  $ ffmpeg -f alsa -i pulse -r 30 -s 1366x768 -f x11grab -i :0.0 -vcodec libx264 - preset ultrafast -crf 0 -y screencast.mp4
...
Unable to find a suitable output format for 'pipe:'


  


• Play the last minute of an mp3 file in Linux [closed]

  29 mai 2021, par Jörg

  I have got a number of audiobooks with play times beyond 30h. I noticed that a handful are corrupted towards the end. I have been trying to find ways to play only the last couple of minutes. ffplay -ss <seconds></seconds> doesn't seem to be able to do it since the files are too big.

  


  I'm able to jump ahead to position 50000 but any higher value, such as 98000, and that ffplay gets stuck.

  


  ffplay -ss 50000  bigfoo.mp3

  


  Does anyone know a fix or an terminal based alternative ? I also had a look into Python but didn't find any relevant packages that can start playing in the middle of an audio file.

  


• 'ffmpy' cannot find 'ffmpeg' when running in PyCharm on Mac using conda env

  5 janvier 2020, par user12448123

  When I ran the following piece of code in PyCharm on MacOS Catalina within conda environment :

  import ffmpy
  
  
  
  ff = ffmpy.FFmpeg(
  
       inputs={'download/v_5c80f6ac3e28a_7BumyNgu/video.m3u8': ['-protocol_whitelist', 'crypto,file,http,https,tcp,tls']},
  
       outputs={'download/ffmpy_test.mp4': None}
  
  )
  
  print(ff.cmd)
  
  ff.run()

  I got this error :

  Traceback (most recent call last):
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/site-packages/ffmpy.py", line 95, in run
  
      stderr=stderr
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/subprocess.py", line 800, in __init__
  
      restore_signals, start_new_session)
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/subprocess.py", line 1551, in _execute_child
  
      raise child_exception_type(errno_num, err_msg, err_filename)
  
  FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg': 'ffmpeg'
  
  
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "/Users/myname/Documents/Projects/xiaoetong/ffmpy_test.py", line 8, in <module>
  
      ff.run()
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/site-packages/ffmpy.py", line 99, in run
  
      raise FFExecutableNotFoundError("Executable '{0}' not found".format(self.executable))
  
  ffmpy.FFExecutableNotFoundError: Executable 'ffmpeg' not found
  
  
  
  Process finished with exit code 1
  
  </module>

  The traceback info above literally implies that either ffmpeg is not installed or command is not added to path. However, I did install it, and I could call ffmpeg command successfully in terminal. I could even run that python script without error in zsh terminal within exactly the same conda environment (and using exactly the same python interpreter).

  (Some information that might be useful :

  1. The same code could also be run without error within the same conda environment in PyCharm on Windows 10.

  2. python==3.7.5, ffmpeg==4.2, ffmpy==0.2.2 )

  This error is just so weird that I have no clue. Someone please help, I would appreciate.