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• Use animation.save with ffmpeg writer within a Python package

  16 janvier 2021, par Logan Yang

  I'm writing a Python package that produces some animated plots. I can successfully use matplotlib.animation.save to save gifs as such :

  


  anim.save(f"./{file}", writer="imagemagick", fps=15)


  


  But if I try to save it to mp4 like this, it doesn't work because I guess it can't find ffmpeg on my system (MacOS)

  


  anim.save(f"./{file}",writer=FFMpegWriter(fps=15))


  


  Error :

  


  MovieWriter stderr:
dyld: Library not loaded: /usr/local/opt/x265/lib/libx265.165.dylib
  Referenced from: /usr/local/bin/ffmpeg
  Reason: image not found
...


  


  My intention is to make it platform agnostic, since it's a Python package I'm writing, I would like it to be portable so that the user can use it out-of-the-box with pip install . Since gif is already working with imagemagick, I'm not sure how to make it work for ffmpeg writer.

  


  I tried pip install ffmpeg in my project but that didn't work. Any suggestion is appreciated !

  


• How save an audio buffer with Fluent FFmpeg

  17 juin 2016, par Luke

  I have a Buffer object that contains audio data and I’m wondering if I can save this Buffer through Fluent FFmpeg without writing it to a file temporary first.

  I came across this other question : fluent-ffmpeg module : "end" event does not fire

  Which seems to do what I need but with video, however, this technique doesn’t seem to work for me. I get the following error :

  ffmpeg write error 'Input stream error: not implemented'

  How can I pipe a Buffer directly to Fluent FFmpeg without writing it to a temporary file first ?

• How to open&save a video file in python ?

  27 août 2014, par AliGH

  I’ve just started to make a ubuntu application using PyGtk. My very first object is to open, convert and then save a video file. Ignoring convert phase, I’m going to implant open-save functions. But at the moment when I open a video file, and save it, I get non-video file with 11B size. I’ve just google this and found OpenCV for python. But I’m not sure if it’s the best way to do it. I also think I’m going to use ffmpeg libraries to do some manipulates on video files. Is it what I want or there might be other built-in libraries ?

  By the way, here’s my code to open and save the file :

      def on_openFile_clicked(self, widget):
  
          filename=None
  
          dialog = Gtk.FileChooserDialog("Please choose a file", self,
  
              Gtk.FileChooserAction.OPEN,
  
              (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
  
               Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
  
  
  
          response = dialog.run()
  
          self.add_filters(dialog)
  
  
  
          if response == Gtk.ResponseType.OK:
  
              filename = dialog.get_filename()
  
          elif response == Gtk.ResponseType.CANCEL:
  
              print 'Cancel Clicked'
  
          dialog.destroy()
  
  
  
          print "File Choosen: ", filename
  
  
  
      def add_filters(self, dialog):
  
  
  
          filter_py = Gtk.FileFilter()
  
          filter_py.set_name("Video Files")
  
          filter_py.add_mime_type("video/mp4")
  
          filter_py.add_mime_type("video/x-flv")
  
          dialog.add_filter(filter_py)
  
  
  
          filter_any = Gtk.FileFilter()
  
          filter_any.set_name("Any files")
  
          filter_any.add_pattern("*")
  
          dialog.add_filter(filter_any)
  
  
  
      def on_saveFile_clicked(self, widget):
  
          filename=None
  
          dialog = Gtk.FileChooserDialog("Please choose a file", self,
  
              Gtk.FileChooserAction.SAVE,
  
              (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
  
               Gtk.STOCK_SAVE, Gtk.ResponseType.OK))
  
  
  
          response = dialog.run()
  
          self.add_filters(dialog)
  
  
  
          if response == Gtk.ResponseType.OK:
  
              filename = dialog.get_filename()
  
          elif response == Gtk.ResponseType.CANCEL:
  
              print 'Cancel Clicked'
  
          dialog.destroy()
  
  
  
          if filename != None:
  
              save_file=open(filename, 'w')
  
              save_file.write("Sample Data")
  
              save_file.close()
  
          print "File Saved: ", filename