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• Making use of -w option in pyinstaller does not start/create the subprocess in python

  15 novembre 2018, par User

  I am making use of python to invoke ffmpeg to start and stop video capturing. I do not want to the console window appear when my python exe starts. The code I have currently to start and stop video recording is below,

  cmd = '\\ffmpeg\\bin\\ffmpeg.exe -loglevel quiet -f gdigrab -framerate 30 -i desktop -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 0 -threads 0 ' + '"' + final_file_for_video_processing + '"'
  
  
  
  def stop_screen_recording():
  
      sub_process.stdin.write("q".encode())
  
      stdOutput, stdError = sub_process.communicate()
  
  
  
  
  
  def stop_screen_recording(cmd):
  
      startupinfo = subprocess.STARTUPINFO()
  
      startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
  
      global sub_process
  
      sub_process = subprocess.Popen(cmd, startupinfo=startupinfo, 
  
      stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=None)
  
      sub_process.wait()

  The challenge faced is, when I build the exe using
  pyinstaller -w —onefile python_file_name.py the recording does not begin. Note : The -w is to not show the console window.

  If I were to make use of pyinstaller and build the exe in the following way,
  pyinstaller —onefile python_file_name.py then recording of the video begins.
  Note : Without the -w command it works perfectly fine.

  I want to make use of the -w command since I do not want to show the console window of my python exe. Any insights will help.

• hvcc : zero initialize the nal buffers past the last written byte

  23 février 2018, par James Almer

  hvcc : zero initialize the nal buffers past the last written byte
  Bug-Id : 1116
  
  Cc : libav-stable@libav.org
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DBH] libavformat/hevc.c

• Finishing stream 0:0 without any data written to it. Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  10 juin 2020, par Godspower

  I am trying to pipe an mp4 video to an ffmpeg server but it returned the following error message :

  



  "Finishing stream 0:0 without any data written to it.
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)"

  



  Please any suggestions will be deeply appreciated

  



  many thanks