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• How to set ffmpeg for matplotlib in mac os x

  1er juillet 2023, par AlexNoir

  I want to animate some plots with matplotlib. The version I have is the Enthough Canopy distribution (Version : 1.1.0.1371), running in a mac os x 10.8 (Mountain Lion). I have used the FuncAnimation routine from the animation package of matplotlib. My problem comes saving the animation. I want to save in mp4 format :

  



  anim.save('test.mp4',fps=30)


  



  The error I get is :

  



  UserWarning: MovieWriter ffmpeg unavailable 
warnings.warn("MovieWriter %s unavailable" % writer)


  



  So I installed ffmpeg via Macports. But I am still having the same error. Do you know how to setup matplotlib in order to recognise ffmpeg ? Do I have to change the matplotlibrc file ?
Thanks.

  



  EDIT : I have realized that I can manually put '/opt/local/bin' in the PYTHONPATH, but it does not change the PATH in Enthough Canopy. Do anyone know how to change the PATH in canopy ?

  


• ffmpeg convert a series of images to video - with crossfade or any other transition between every two frames

  29 février 2020, par Narendra Singh

  I am currently able to convert a series of images to video, but I do also need to add transitions / animation in between them.

  String[] ffmpegCommand = {"/data/data/mypackage/app_bin/ffmpeg", "-y",
  
  "-qscale", "1", "-r", "" + framerate, "-i", "/data/data/mypackage/app_ipImg/image%3d.jpg",
  
  "-t", "" + (((total_images) * delay_of_each_frame_in_seconds) + 4), //"-s",heightwidth,
  
  "-vcodec", "libx264", "-s", "640x480",
  
   Environment.getExternalStorageDirectory() + "/photo_directory/myVideo.mp4"};

  The above command is working for me to create video from image series

  But

  Now, I do want to add fade or other transition / animation to be displayed in final video before each of the frames.

  I googled a lot, but didn’t find any solution to this trouble, yet.

  Please suggest me the way.

  Thanks in advance.

• combining / piping multiple ffmpeg commands to animate gif when using winff

  17 mai 2016, par Rick T

  Greetings I can convert a video file to a high quality animated gif file with the following lines below.

  ffmpeg -i test.mkv -vf palettegen palette.png
  
  ffmpeg -i test.mkv -i palette.png -lavfi paletteuse rot_pal.gif

  But I would like to use winff so I need to combine the two working lines together into one ffmpeg line operation. I can convert any video file to a animated gif with winff by editing the xml file below.

  <gifanimation>
  
      <label>Gif Animation Simple</label>
  
      <params>-f gif</params>
  
      <extension>gif</extension>
  
      <category>Gif Animation</category>
  
    </gifanimation>

  But what alteration do I need to do to the <params></params> line to get the two lines below into one ffmpeg line operation.

  ffmpeg -i test.mkv -vf palettegen palette.png
  
  ffmpeg -i test.mkv -i palette.png -lavfi paletteuse rot_pal.gif
  
  
  
  It looks like it needs to:
  
  1) generate the color palette from the video
  
  2) save the color palette to a file
  
  3) read the color palette back in
  
  4) apply it to the gif animation file.