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• How to record all dynamic videos in the process of capturing screen video with ffmpeg from a python program?

  4 December 2020, by fengnix

  I have many robotframework test cases and in the first case, a ffmpeg command like the following is invoked to record the whole running process:

  


  ffmpeg -framerate 30 -f gdigrab -i desktop -c:v libx264rgb -crf 0 -preset ultrafast output.mkv


  


  Whenever I firstly run all cases and then manuually run the above command from an addition command console, the recorded video always looks fine, it looks like all contents on the screen can be correctly captured.

  


  However, once I execute the command the same as the above one in the first case by call the following code:

  


  p=subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)


  


  and then in the final test case the record process is stopped by calling the following code to tell ffmpeg that we want to stop the recording:

  


  p.stdin.write(bytes("q",'UTF-8'))  


  


  the final result video only contain correct contents of the "start" and the "end" of the whole process, but all other contents no longer changed and seemd just a static image, which means all the dynamic effects on the screen cannot be captured.

  


  Could anyone be so kind as to let me know what the matter is and how to solve it?

  


• ffmpeg crop with negative offset

  12 August 2020, by Ajouve

  I have a nodejs application which is cropping videos using ffmpeg

  


  From time to time I have an error because I am trying to crop out of the video, see attached image where the black is the video and in red the crop zone. My final video has to be a square.

  


  

  


  If I am replacing the negative offset with 0 the final result will not be a square.

  


  I just need to add a black background on the non-existing part

  


  This is my actual code

  


  const cropVideo = (buffer, width, height, x, y) => {

    const inputFile = tmp.fileSync();
    const outputFile = tmp.fileSync();

    fs.writeFileSync(inputFile.name, buffer);

    return new Promise((resolve, reject) => {
        ffmpeg(inputFile.name)
            .videoFilters(`crop=${width}:${height}:${x}:${y}`)
            .format('mp4')
            .on('error', reject)
            .on('end', () => resolve(fs.readFileSync(outputFile.name)))
            .save(outputFile.name);
    })
}


  


• Museum of Multimedia Software, Part 3

  18 August 2010, by Multimedia Mike — Software Museum

  Discreet Cleaner 5
  Capture, author, encode, and publish multimedia in Real, QuickTime, Windows Media, MP3, DV, and MPEG formats. This package has a copyright date of 2001 (thus predating Flash video by a few years). This software seems to have since been purchased by Autodesk and is up to version 6.5 (which does support Flash video).

  
  
  

  Discreet Plasma
  "Web 3D Design." Package is copyright 2002. Like the last package, this package also makes reference to Discreet being a division of Autodesk. Sure enough, Autodesk purchased them in 1999 and would later rename them Autodesk Media and Entertainment.

  
  
  

  Debabelizer
  "The Graphics Processing Toolbox." Looking down its list of features on the box copy, I honestly wonder if it can accomplish anything that ImageMagick can’t.

  
  
  

  MatchWare Mediator 7
  "Create Flash, HTML & CD-Rom Presentations." Wow, version 7, and with a latest copyright date of 2002 on the box. There’s still a top-Google-hit web page for MatchWare Mediator 9, this one instead emphasizing interactive CDs, HTML, and then Flash.

  
  
  

  Final Cut Pro v1.2.5
  Promotional copy Apple’s video editing software. No copyright date, but it requires a PowerPC G3 or G4 and Mac OS 9.

  
  
  

  Apple Keynote
  More Apple software that I think can technically be classified as multimedia-related. I’m not sure which version this is.