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• Piping to FFMPEG with Python subprocess freezes

  5 décembre 2016, par Simon Streicher

  With the following code, I am able to pipe frames of a video to FFMPEG using Python, Numpy and the FFMPEG binaries :

  from __future__ import print_function
  
  import subprocess
  
  import numpy as np
  
  import sys
  
  
  
  npshape = [480, 480]
  
  cmd_out = ['ffmpeg',
  
             '-y', # (optional) overwrite output file if it exists
  
             '-f', 'rawvideo',
  
             '-vcodec','rawvideo',
  
             '-s', '%dx%d'%(npshape[1], npshape[0]), # size of one frame
  
             '-pix_fmt', 'rgb24',
  
             '-r', '24', # frames per second
  
             '-i', '-', # The input comes from a pipe
  
             '-an', # Tells FFMPEG not to expect any audio
  
             '-vcodec', 'mpeg4',
  
             'output.mp4']
  
  
  
  fout = subprocess.Popen(cmd_out, stdin=subprocess.PIPE, stderr=subprocess.PIPE).stdin
  
  
  
  for i in range(24*40):
  
      if i%(24)==0: 
  
          print('%d'%(i/24), end=' ')
  
          sys.stdout.flush()
  
  
  
      fout.write((np.random.random(npshape[0]*npshape[1]*3)*128).astype('uint8').tostring())
  
  
  
  fout.close()

  This works fine if I write anything less than 37 seconds worth of frames, but if I try to write anything more, the code just hangs. What is the underlying cause for this behaviour ? How can I fix it ?

• opencv3.1 python VideoCapture black screen

  3 mai 2017, par alex

  i’m trying to use opencv3.1 with python3.5
  following this official)tutorial
  http://docs.opencv.org/3.0-beta/doc/py_tutorials/py_gui/py_video_display/py_video_display.html#display-video

  the camera led is "on" but the window doesn’t show any image (black)

  my current enviroment :
   windows 10
   python 3.5.2 (32bit)
   numpy 1.12.0b1 (32bit) binaries downloaded from : http://www.lfd.uci.edu/ gohlke/pythonlibs/
   opencv 3.1.0 (32bit) binaries downloaded from : http://www.lfd.uci.edu/ gohlke/pythonlibs/

  they seem installed correctly !

  as the tutorial says :

  Note Make sure proper versions of ffmpeg or gstreamer is installed. Sometimes, it is a headache to work with Video Capture mostly due to wrong installation of ffmpeg/gstreamer.

  i’ve no ffmpeg installed !!! so i suppose this is the cause of my problem
  so the questions are :
  1) which version of ffmpeg is needed ?
  2) how install ffmpeg on windows ? it seems a setup doesn’t exist(there is a binary section with a zip file ? how to use it after unzipped ?)
  3) is possible to see(in some way) if the opencv binaries(that i’ve downloaded) were compiled with ffmpeg support(flag ?)

  PS : i’ve tried to add the ffmpeg folder path the the PATH enviroment variable but nothing change

• Discord Python - ffmpeg not Found

  22 octobre 2020, par IBgreat

  So I am making a music bot for Discord and I need ffmpeg for it. So I have Installed it and Placed in C : and also added to the Environment Variables. But whenever I run the Code I get the Error

  


  discord.ext.commands.errors.CommandInvokeError: Command raised an exception: ClientException: ffmpeg was not found.


  


  I do not have Any Idea why this doesn't Work.

  


  https://prnt.sc/v4in62 <— This is How I add Environment Variables

  &#xA;