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• How to combine multiple images horizontally and vertically using ffmpeg [duplicate]

  7 février 2020, par user3625087

  I’m attempting to create a script that can stitch together images side by side. These images are basically letters that I want to create words with (think of those ransom letters in Hollywood movies with randomly cut out letters from magazines). I need to specifically use these images, so I don’t want ffmpeg to type out some words into images itself. I’ve seen some similar answers using hstack and tile filter complexes but those didn’t work for me. Here is what I’ve tried so far :

  ffmpeg -pattern_type glob -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex tile=5x1 test.png

  For this one, -pattern_type didn’t exist as an option (I’m using ffmpeg 4.2 on Windows), so I removed it and the result was 1 letter and black space for the rest.

  ffmpeg -y -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex hstack test.png

  For this one, the result was 2 letters side by side, and then black space for the rest.

  All of my images are of the same height and variable width. Is there a command that can achieve this ?

• headless chrome capture screen video or animation

  14 septembre 2019, par t_io

  I try to capture some animations from a website and stitch them together using ffmpeg.
  As far as I understand the docs startScreencast is the way to go.

  If I understand that right I can start the screencast with

  await Page.startScreencast({format: 'png', everyNthFrame: 1});

  and listen to every incoming frame with

  Page.screencastFrame(image =>{
  
    const {data, metadata} = image;
  
    console.log(metadata);
  
  });

  But it’s never prints out something. So I assume it’s not called.

  I archived my goal with something like this :

  let counter = 0;
  
  while(counter < 500){
  
    await Page.startScreencast({format: 'png', everyNthFrame: 1});
  
    const {data, metadata} = await Page.screencastFrame();
  
    console.log(metadata);
  
    counter += 1;
  
  }

  Which feels like a non-performant hack.
  So any suggestions on how to use startScreencast and screencastFrame properly ?

• FFmpeg Image to Video command consuming 100% CPU

  23 décembre 2023, par Dishan Verma

  I am working on a project where I need to first extract all the frames of videos and after extracting the frames I need to stitch the frames back again showing 1 frame for exactly 1 seconds i.e I need to create a 1 FPS video from extracted frames.

  


  I am successfully able to extract frames of video using ffmpeg without any issues.

  


  But my FFmpeg command which I am using to convert frames to 1 FPS video is consuming 100% CPU, for example a 40 mb video input is consuming 8 GB of CPU. Below is how my FFmpeg command looks like.

  


  final String ffmpegCommandFormat = "%s -framerate 1 -i %s -c:v libx264 -pix_fmt yuv420p -crf 18 -y %s";
final String ffmpegCommand = String.format(ffmpegCommandFormat, FFMPEG_EXEC_PATH, framesPathRegex, pathToStoreProcessedVideo);


  


  I am creating a service which needs to support around 2 GB sized videos and with the current behaiviour it cannot even support 100 MB of video.

  


  Can anyone please help me here to understand why FFmpeg is consuming too high CPU and how can i resolve this issue ?
Is there any alternate/better/fast/efficient command which I can use to created 1 FPS video wither from extracted frames or directly from input video ?

  


  I am new to ffmpeg so not sure what else to explore.