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• How to effectively turn high resolution images into a video with ffmpeg ?

  5 septembre 2022, par Sprout Coder
  

  • I have 24 frames (frame-%d.png)

  


  • I want to turn them into a video that will be 1 second long

  


  • That means that each frame should play for 1/24 seconds

  


  


  I'm trying to figure out the correct settings in order to achieve that :

  


  await new Promise((resolve) => {
  ffmpeg()
    .on('end', () => {
      setTimeout(() => {
        console.log('done')
        resolve()
      }, 100)
    })
    .on('error', (err) => {
      throw new Error(err)
    })
    .input('/my-huge-frames/frame-%d.png')
    .inputFPS(1/24)
    .output('/my-huge-video.mp4')
    .outputFPS(24)
    .noAudio()
    .run()


  


  

  1. Are my inputFPS(1/24) & outputFPS(24) correct ?

  


  2. Each frame-%d.png is huge : 32400PX x 32400PX ( 720Mb). Will ffmpeg be able to generate such a video, and if so, will the video be playable ? If not, what is the maximum resolution each frame-%d.png should have instead ?

  


  3. Since the process will be quite heavy, I believe using the command line could be more appropriate. In that case, what is the equivalent of the above Js code in the command line (as in ffmpeg -framerate etc...) ?

  


  


• ffmpeg : How do I set the framerate and keep the default image resolution ?

  8 septembre 2022, par Sprout Coder

  I have 23 frames inside a folder (each frame has the same resolution) :

  


  frame-1.png
frame-2.png
......
frame-23.png


  


  I want to create a 1 second video that will have the same resolution.
Each frame should therefore last for 1/23 seconds.

  


  I tried to following command :

  


  ffmpeg -r 23 -i "frame-%d.png" -c:v libx265 -r 23 out.mp4


  


  But my mac crashed.

  


  The resolution of each image is really big (15000x15000) but not big enough for ffmpeg to throw the usual "value is too big" (>INT_MAX) error..

  


  I think it crashes because my command is not correct.

  


  Could you please confirm what the correct command should be to achieve what I want ?

  


  Also, will the frames be ordered correctly according to this command ?

  


  Thank you in advance for your help

  


• change resolution of video using ffmpeg

  28 octobre 2022, par david

  I have a folder that contains videos with a resolution of 1080 and different bitrates. I am trying to change their resolution to 480 and using the following code :

  


  subprocess.call(['ffmpeg.exe','-i', pname1,'-vf', 'scale=-1:480,setsar=1:1','-c:v','libx264','-pix_fmt' ,'yuv420p','-b:v', str(cnt)+'K', '-bufsize', str(cnt)+'K' ,'-minrate', str(cnt)+'K','-maxrate', str(cnt)+'K', '-x264opts','keyint=60:min-keyint=60','-preset', 'veryfast', '-profile:v', 'high', '-f', 'hls', '-hls_time', '2', '-hls_list_size','0', pname2])


  


  but it produces noting in the related filename (pname2). it also shows no error.
what is the problem and how can I change the resolution to 480 ?