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• Saving Animated Matplotlib Chart to GIF

  29 mai 2020, par Jonathan Bechtel

  I have an animated matplotlib chart that I'm trying to save to a .gif file, but I can't get my image writer to work.

  



  I've installed imagemagick and verified that it works on my computer via the instructions given on its installation page, but when I do this :

  



  anim.save('gd.gif', writer='imagemagick')


  



  I get the following error message :

  



  MovieWriter imagemagick unavailable. Trying to use pillow instead.


  



  However, doing anim.save('gd.gif', writer='pillow') gives the following error message :

  



  ValueError: not enough image data


  



  I tried installing ffmpeg with the command conda install -c conda-forge ffmpeg. It looked like it installed correctly, but I don't know how to bind it to matplotlib apparently.

  



  Specifying the writer as ffmpeg gives the same error message that I encountered with imagemagick.

  



  I also tried adding imagemagick's path to matplotlib's config file path with the following line :

  



  animation.convert_path: 'C:\Program Files\ImageMagick-7.0.8-Q16\magick.exe'


  



  That was suggested in this question.

  



  None of these seemed to have worked though.

  



  I'm on Windows 10, and am using Python 3.7

  


• how to resolve Accord.Video.FFMPEG error Rational is defined in an assembly that is not referenced

  18 janvier 2023, par HighwayRob

  I have developed a visual studio c# Windows app that I want to use Accord.Video.FFMPEG.DLL to merge JPGs into a video file.

  


  I added the reference to the DLL and the following code :


  


   using Accord.Video.FFMPEG;

private void videoTestBttn_Click(object sender, EventArgs e)
{
    int width = 320;
    int height = 240;
    Bitmap bitmap;

    // create instance of video writer
    VideoFileWriter writer = new VideoFileWriter();
    // create new video file
    writer.Open("c:\\test.avi", width, height, 25, VideoCodec.MPEG4);
    // create a bitmap to save into the video file
    Bitmap image = new Bitmap(width, height, PixelFormat.Format24bppRgb);
    // write 1000 video frames
    for (int i = 0; i < 100; i++)
    {
        image.SetPixel(i % width, i % height, Color.Red);
        bitmap = new Bitmap(ffiles[i, 0].ToString());
        writer.WriteVideoFrame(bitmap);
        bitmap.Dispose();
    }
    writer.Close();

}


  


  I get the following error in the build on the 'writer.Open' line of code :

  


  Error CS0012 The type 'Rational' is defined in an assembly that is not referenced. You must add a reference to assembly 'Accord, Version=3.8.0.0, Culture=neutral, PublicKeyToken=fa1a88e29555ccf7'.

  


  Downloaded DLL from https://nuget.info/packages/Accord.Video.FFMPEG/3.8.2-alpha

  


  How and where to I add this reference ?
Looking forward to some assistance !

  


• Error while transcoding video from one format to another

  24 octobre 2019, par MalTec

  I am using xuggler API to transcode Video from one format to another.

  Following the example, provided by

  http://wiki.xuggle.com/MediaTool_Introduction & http://www.javacodegeeks.com/2011/02/xuggler-tutorial-transcoding-media.html

   public void convertVideo() {
  
  
  
   String sourceUrl = getResourceDirectory() + "/in/AV36_1.AVI";
  
   String destUrl = getResourceDirectory() + "/out/output.mp4";
  
  
  
   IMediaReader reader = ToolFactory.makeReader(sourceUrl);
  
  
  
   // add a viewer to the reader, to see progress as the media is
  
   // transcoded
  
   reader.addListener(ToolFactory.makeViewer(true));
  
  
  
   // create a writer which receives the decoded media from
  
   // reader, encodes it and writes it out to the specified file
  
   IMediaWriter writer = ToolFactory.makeWriter(destUrl, reader);
  
  
  
   // add a debug listener to the writer to see media writer events
  
   writer.addListener(ToolFactory.makeDebugListener());
  
  
  
  
  
   ////
  
   ////       // create the media writer
  
   reader.addListener(ToolFactory.makeWriter(destUrl, reader));
  
  
  
   // read packets from the source file, which dispatch events to the
  
   // writer, this will continue until 
  
  
  
  
  
   while (reader.readPacket() == null)
  
    do {} while (false);
  
  }

  Provides Could Not Open Exception :

    Exception in thread "main" java.lang.RuntimeException: could not open: D:\Malhar\project_works\VideoConvertter/resources/in/AV36_1.AVI
  
      at com.xuggle.mediatool.MediaReader.open(MediaReader.java:637)
  
      at com.xuggle.mediatool.MediaReader.readPacket(MediaReader.java:434)
  
      at util.VideoEncoder.convertVideo(VideoEncoder.java:38)
  
      at ConvertVideo.main(ConvertVideo.java:12)

  Have tried with different file to.. But, the result is same.