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• unconnected output - FFMPEG

  9 avril 2018, par Hernan Quintero

  Im trying to make my first apple Service.

  I want FFMPEG to extract 5.1 Audio from a video with this command line :

  ffmpeg -i infile \
  
  -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL] 
  
  [BR]" \
  
  -map "[FL]" front_left.wav \
  
  -map "[FR]" front_right.wav \
  
  -map "[FC]" front_center.wav \
  
  -map "[LFE]" lfe.wav \
  
  -map "[BL]" back_left.wav \
  
  -map "[BR]" back_right.wav

  It works very good from the Terminal, but when I try to make a Service in Automator I get the following error :

  Filter channelsplit:BR has an unconnected output

  This is the command line for the service :

  on run {input, parameters}
  
  tell application "Terminal"
  
      activate
  
      set filesString to ""
  
      repeat with file_ in input
  
          set filesString to filesString & " " & quoted form of (POSIX path of file_)
  
      end repeat
  
      do script "for f in" & filesString & "; do
  
  /usr/local/bin/ffmpeg -i \"$f\" -filter_complex 
  
  channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR] 
  
  -map [FL] front_left.wav 
  
  -map [FR] front_right.wav 
  
  -map [FC] front_center.wav 
  
  -map [LFE] lfe.wav 
  
  -map [BL] back_left.wav 
  
  -map [BR] back_right.wav 
  
  done"
  
  end tell
  
  return input
  
  end run

  Could you guys help me to figure out what I’m doing wrong ?

  Thank you very much.

• matplotlib "RuntimeError : No MovieWriters available" when ffmpeg is installed

  11 août 2014, par user1637894

  I’m using OSX Mavericks and the Enthought Canopy distribution of python. I’m trying to run any simple example script that uses matplotlib.animation to save an animation, but I always get the following error :

  Traceback (most recent call last):
  
  File "/Users/Sam/Google Drive/Spyder workspace/MiscScripts/animation.py", line 14, in <module>
  
      FFMpegWriter = manimation.writers['ffmpeg']
  
  File "/Users/Sam/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/matplotlib/animation.py", line 63, in __getitem__
  
      raise RuntimeError("No MovieWriters available!")
  
  RuntimeError: No MovieWriters available!
  
  </module>

  Ffmpeg is installed on my system : I can access it by typing ffmpeg into a new terminal. So I’m guessing matplotlib simply doesn’t know that ffmpeg is available because it is not in the python path. So I tried typing which ffmpeg into a new terminal window to find where ffmpeg was installed, then I added this string to my python path via sys.append('path_here'), but this didn’t help.

• Convert Transparent PNGs to a Transparent Video

  15 février 2023, par Aurora7979

  I have a set of transparent PNG pictures, and I want to convert them into a video with transparent background (play the PNGs continuously).

  


  First, I used ffmpeg with the terminal command :

  


  ffmpeg -framerate 30 -pattern_type glob -i '*.png' \-c:v libx264 -pix_fmt yuva420p out.mp4


  


  And I learnt that the codec libx264 does not compatible with the alpha channel. Then, I changed to another codec and used the following command :

  


  ffmpeg -framerate 30 -pattern_type glob -i '*.png' \-c:v libvpx-vp9 -pix_fmt yuva420p out.mp4


  


  However, QuickTime Player cannot play the resulting out.mp4. I don't know if it was because the video conversion failed or it was the fault of QuickTime Player. The terminal didn't show any error message, though.

  


  Therefore, I would like to ask :

  


  


  1. Which codec I should use to create a transparent video that a normal video player can play ?

     


  


  2. Can the output MP4 video format support transparent videos ?

     


  


  3. If there is another tool that is far more superior than ffmpeg for my purpose, I am willing to give it a try.

     


  


  


  Thank you for any advice.

  


  All the best,

  


  Aurora