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• "The system cannot find the file specified" when animating with ffmpeg in matplotlib

  27 novembre 2019, par algol

  I am trying to generate a movie from a stack of numpy arrays using a function I have used on a different computer (a mac) on my home computer (Windows 10). Here is the function that I am using :

  def make_animation(frames,name): 
  
  
  
      plt.rcParams['animation.ffmpeg_path'] = u'C:\ffmpeg-20190320-0739d5c-win64-static\bin\ffmpeg.exe' 
  
      n_images=frames.shape[2] 
  
      assert (n_images>1)   
  
      figsize=(10,10)
  
      fig, ax = plt.subplots(figsize=figsize)
  
      fig.tight_layout()
  
      fig.subplots_adjust(left=0, bottom=0, right=1, top=1, wspace=None, hspace=None)
  
      #lineR, = ax.plot(xaxis_data[0],R_data[0],'c-',label="resources")
  
      img = ax.imshow(frames[:,:,0], animated = True)   
  
  
  
  
  
      def updatefig(img_num): 
  
  
  
          #lineR.set_data(xaxis_data[img_num],R_data[img_num],'r-')
  
  
  
          img.set_data(frames[:,:,img_num])
  
  
  
          return [img]
  
  
  
  
  
      ani = animation.FuncAnimation(fig, updatefig, np.arange(1, n_images), interval=50, blit=True)
  
      mywriter = animation.FFMpegWriter(fps = 20)
  
      #ani.save('mymovie.mp4',writer=mywriter)
  
  
  
      ani.save(f"D:\{name}.mp4",writer=mywriter)
  
  
  
      plt.close(fig)

  Here is the error that I am getting :

  Traceback (most recent call last):
  
  
  
    File "", line 1, in <module>
  
      make_animation(stack,'full_test')
  
  
  
    File "", line 27, in make_animation
  
      ani.save(f"D:\{name}.mp4",writer=mywriter)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 1136, in save
  
      with writer.saving(self._fig, filename, dpi):
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\contextlib.py", line 112, in __enter__
  
      return next(self.gen)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 228, in saving
  
      self.setup(fig, outfile, dpi, *args, **kwargs)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 352, in setup
  
      self._run()
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 363, in _run
  
      creationflags=subprocess_creation_flags)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 143, in __init__
  
      super(SubprocessPopen, self).__init__(*args, **kwargs)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\subprocess.py", line 775, in __init__
  
      restore_signals, start_new_session)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\subprocess.py", line 1178, in _execute_child
  
      startupinfo)
  
  
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  </module>

  I know this code basically works since I have used it before on another computer. My guess is that something about ffmpeg is messed up or something about the output path is wrong. I’m not sure what could be wrong with the ffmpeg since I definitely have it installed (via conda) and the path is pretty straightforward. On the other hand I’m not sure what could be wrong with the output path.

• Which Platform/Language to choose for Video Management System [closed]

  5 décembre 2019, par Vivek Buddhadev

  We have started on a new project, Which enables for the multiple IP cameras(Around 1000 Cameras) to record as well as available for live streaming.

  Like https://www.security.honeywell.com/uk/product-repository/maxpro-vms

  Initially, we have tried using ffmpeg commands that saves data in chunks :

  ffmpeg -i {rtsp_url} -fflags flush_packets -max_delay 2 -flags -global_header \
  
      -hls_time 2 -hls_list_size 3 -vcodec copy -y /var/www/html/Cam01.m3u8

  Then we have started http server and using node.js we are displaying the stream.

  But as we are adding more cameras into it, the performance is going down.

  Kindly suggest if there is any other way to achieve this functionality which help us to fulfill the above requirement.

• FFmpeg os.system commands not working but work in Terminal

  28 janvier 2020, par Oscar Dolloway

  I’ve downloaded ffmpeg through the website and ran some commands through the terminal to confirm its install.

  when running the command ’ffmpeg’ in the Terminal it returns

   ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg 
  
   developers
  
   built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

  if i type into Python

  import os
  
  os.system ('ffmpeg')

  it returns

   os.system ('ffmpeg')
  
   sh: ffmpeg: command not found
  
   Out[25]: 32512

  any ideas ?

  Solution :

   ffmpeg = '/bin/ffmpeg' #path to the binary file
  
  
  
   os.system(ffmpeg)

  Output :

  os.system (ffmpeg)
  
  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)