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• matplotlib funcanimation save issue

  20 avril 2015, par Richie Abraham

  I have been trying some animation recently using matplotlib animations. It has been going great, i create an ffmpeg writer and save it as a video file. However i face an issue whenever the function that FuncAnimation calls returns more than one object.

  Below is a small snippet of my code base. When I return both im0 and im1, the video file created only has im1 , although the plt.show command works as expected ( showing both the videos ). If i return just a single im0, then it works as expected. IT also works as expected if i return both im0 and im1 with alpha=0.5.

  Can anyone shed some light on what is happening underneath the hood ?

  fig, ax = plt.subplots(1)
  
  def animate(i):
  
      im0=ax.imshow(np.ma.masked_array(imgl[i][:,:,0], mask=get_blob(i)),cmap='cubehelix')
  
  
  
      im1=ax.imshow(imgl[(i-100)%len(imgl)][:,:,0],cmap='cubehelix')
  
  
  
      return [im1,im0]
  
  
  
  
  
  
  
  ani = animation.FuncAnimation(fig, animate, frames=200,
  
                                interval=10, blit=True,repeat=False)
  
  ani.save('ps.mp4', writer=writer)
  
  plt.show()

• How to save the output of an FFmpeg command into a text file

  14 décembre 2019, par Baba.S

  How can I save the output of an ffmpeg process into a text file ? I see the stuff I want to save come up in the terminal :

  frame=62 fps=0.0 q=-0.0 size=0kB time=00:00:01.06 bitrate=0.3kbit
  
  frame=116 fps=115 q=-0.0 size=0kB time=00:00:01.97 bitrate=0.2kbit
  
  frame=175 fps=116 q=-0.0 size=kB time=00:00:02.92 bitrate=0.1kbit
  
  frame=232 fps=113 q=-0.0 size=0kB time=00:00:03.87 bitrate=0.1kbit

  But need to know how this can be saved into a test file or even a csv file

• C# FFMPEG - How to get extracted frames without save in file system

  4 janvier 2023, par kadam

  I need to process frames from video and live stream without saving into file system.

  


  C# I am trying using below code, but not getting frames

  


  Process proc = new Process();
            proc.StartInfo.FileName = @"E:\ffmpeg\bin\ffmpeg.exe";
            proc.StartInfo.Arguments = String.Format(@"-i E:\ffmpeg\bin\video.mp4 -f rawvideo pipe:1");
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.Start();
proc.OutputDataReceived += (sender, args) => DataReceived(args);
            proc.ErrorDataReceived += (sender, args) => DataReceived(args);


  


  I can get frames in nodejs successfully using below code

  


  
const spawnProcess = require('child_process').spawn
    ffmpeg = spawnProcess('E:\\ffmpeg\\bin\\ffmpeg.exe', [
      '-i', 'rtsp://username:password@192.168.6.37/ch1/main/sub-stream',
      '-vcodec', 'mjpeg','-vf','fps=2',
      '-f', 'rawvideo',
      //'-s', HW, // size of one frame
      'pipe:1'
  ]);
      ffmpeg.stderr.pipe(logStream);
      let frames = [];
      ffmpeg.stdout.pipe(new ExtractFrames("FFD8FF")).on('data', (data) => {
        var fName=new Date().getTime()+".png";
        (
          async () => await ProcessFrame(Buffer.from(data).toString('base64'))
        )();
      })


  


  Same thing await ProcessFrame(Buffer.from(data).toString('base64')) I want in C#