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• How to convert mp4 to h264 adding AUDs using FFMPEG

  30 décembre 2016, par SyntheticGio

  I am trying to convert an mp4 clip to h264 bytestream format using FFMPEG. I have successfully compiled FFMPEG from source with access to libx264.

  Looking at the documentation for FFMPEG (version 3.2.2) under libx264 there is a bool flag -aud. In the online documentation it gives the example

  ffmpeg -i input.flac -id3v2_version 3 out.mp3

  Using this format, the following command works, but doesn’t produce the desired AUDs in the output file :

  ffmpeg -i input.mp4 -codec:v libx264 -aud 1 output.h264

  I’ve also tried different variants with this including :

  ffmpeg -i input.mp4 -vcodec libx264 -aud 1 output.h264
  
  ffmpeg -i input.mp4 -aud 1 output.h264

  etc.

  I assume there is something I’m misunderstanding about performing this operation. I basically want to take a h264 movie in an mp4 container and dump it as an h264 stream with AUDs added to it. Any idea why this isn’t working ?

  (I’ve also tried using x264 with the -aud flag, also ran fine but didn’t produce the desired output).

• How to convert mp4 to h264 adding AUDs using FFMPEG

  16 mars 2021, par syntheticgio

  I am trying to convert an mp4 clip to h264 bytestream format using FFMPEG. I have successfully compiled FFMPEG from source with access to libx264.

  



  Looking at the documentation for FFMPEG (version 3.2.2) under libx264 there is a bool flag -aud. In the online documentation it gives the example

  



  ffmpeg -i input.flac -id3v2_version 3 out.mp3


  



  Using this format, the following command works, but doesn't produce the desired AUDs in the output file :

  



  ffmpeg -i input.mp4 -codec:v libx264 -aud 1 output.h264


  



  I've also tried different variants with this including :

  



  ffmpeg -i input.mp4 -vcodec libx264 -aud 1 output.h264
ffmpeg -i input.mp4 -aud 1 output.h264


  



  etc.

  



  I assume there is something I'm misunderstanding about performing this operation. I basically want to take a h264 movie in an mp4 container and dump it as an h264 stream with AUDs added to it. Any idea why this isn't working ?

  



  (I've also tried using x264 with the -aud flag, also ran fine but didn't produce the desired output).

  


• Can't find ffmpeg with python

  16 avril 2017, par Edoardo Centamori

  I’m trying to use the module save from matplotlib.animation.FuncAnimation.
  This is the part of the code I’m referring to :

  import matplotlib.animation as animation
  
  plt.rcParams['animation.ffmpeg_path'] ='/Users/edoardo/Downloads/ffmpeg-3.3/ffmpeg'
  
  ...
  
  """other code"""
  
  ...
  
  ani = animation.FuncAnimation(fig, update_mode, 250,
  
                                 interval=50, blit=False)
  
  ani.save('Resonant_modes.mp4', fps=30, extra_args=['-vcodec', 'libx264'])

  But I get this error as a result :

  ValueError: Cannot save animation: no writers are available.
  
  Please install mencoder or ffmpeg to save animations.

  The problem is that I have installed ffmpeg, so I don’t know what to do.
  Could someone explain to me how to do and where should I move the executable ffmpeg file so than Python can find it easly ?

  Edit 1 :
  I’m using mac os x
  FFmpeg should be installed correctly, here’s the output from Bash :

  MBP-di-Edoardo:~ edoardo$ ffmpeg ffmpeg version 2.8.6 Copyright (c)    
  
  2000-2016 the FFmpeg developers built with gcc 4.8.5 (GCC) 
  
  ...more stuff ... 
  
  Use -h to get full help or, even better, run 'man ffmpeg' –

  Edit 2 :
  I’ve tried moving the file to \bin but even using sudo I can’t

  sudo cp ffmpeg /bin
  
  Password:
  
  cp: /bin/ffmpeg: Operation not permitted
  
  MBP-di-Edoardo:Desktop edoardo$