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• ScreenRecording a headless browser using xvfb with ffmpeg or jmf jar(java) shows distorted video in container, if the resolution greaterthan 1024x768

  4 août 2022, par Vigneshwar A S

  I am getting a proper video output, if i used to record a screen resolution for about 1024x768(max) or lesser. but
whenever i used to increase the resolution like "1600x900 or 1920x1080 or greater than
1024x768 (approx.)", i am getting distorted video.

  


  distorted image(frame of a video) with 1600x900 resolution
https://i.stack.imgur.com/iajzC.png

  


  1600x900 video information : https://i.stack.imgur.com/yutDq.png

  


  proper image(frame of a video) with 1024x768 resolution
https://i.stack.imgur.com/NcUt1.png

  


  1024x768 video information : https://i.stack.imgur.com/TeaW7.png

  


  I am using Xvfb & [both ffmpeg and jmf jar (either)] to record a headless browser inside docker container.

  


  I am getting a proper output, if i used to screen record an actual display(monitor), I am facing this issue only when i record the display inside docker (specifically headless browser) by using x11grab.

  


  To Start the Xvfb and ScreenRecording

  


  


  Xvfb :5 -screen 0 1600x900x16 &

  


  ffmpeg -nostdin -hide_banner -nostats -loglevel panic -video_size
1600x900 -framerate 30 -f x11grab -i :5 output.mp4 &

  


  


  if i replaced 1600x900 with 1024x768 or lesser than this, it is providing a proper video without any distortion.

  


  Am I missing anything ??

  


  Please help !

  


  


  Thanks for your time

  


  


• ffmpeg resize logo depending on video resolution with multiple outputs

  30 août 2022, par Panama Jack

  I'm having a tough time trying to get a logo above text in the lower right corner of my videos. The problem is depending on the video size and resolution the logo (image) is too big or too small. Sometimes it overlaps the text. How can I make it so that no matter what the resolution or ratio is, it scales proportionately and always above the text ? For example, videos of 1920x1080 at 16:9 or 1080x1920 9:16, or 1280x720 16:9 or 720x1280 9:16 and so on. Basically, it will always scale correctly on all outputs. Sometimes there might be more outputs but in this code sample there are 3 hls files. I tried scale2ref but can't get that to work and it makes my file sizes much bigger.

  


  Here's my current code.

  


  


  -filter_complex "[1:v]scale=150 :-2[logo] ;[0:v][logo]overlay=main_w-overlay_w-10:main_h-overlay_h-35,drawtext=fontfile=/var/www/area51-process1.somesite.com/html/includes/helveticaneue/HelveticaNeueMed.ttf:text=@somesite:fontcolor=white@0.9:fontsize=(h/32):x=w-tw-15:y=h-th-6,format=yuv420p,split=3[s0][s1][s2] ;[s0]scale=640:360[360p] ;[s1]scale=854:480[480p] ;[s2]scale=1280:720[720p]"
-map "[360p]" -map "[480p]" -map "[720p]" -maxrate:v:0 3000000 -bufsize:v:0 3000000 -maxrate:v:1 4000000 -bufsize:v:1 4000000 -maxrate:v:2 8000000 -bufsize:v:2 8000000 -map 0:a -c:a libfdk_aac -ac 2 -async 1 -ar 48000 -b:a 128k -c:v libx264 -preset veryfast -crf:v:0
25 -profile:v:0 high -crf:v:1 24 -profile:v:1 high -crf:v:2 23
-profile:v:2 high -g 50 -keyint_min 50 -force_key_frames "expr:gte(t,n_forced*2)" -sc_threshold 0 -flags +global_header
-movflags +faststart -max_muxing_queue_size 4096 -threads 0 -f tee "[select='v:0,a':f=hls:start_number=0:hls_flags=single_file:hls_playlist_type=vod:hls_segment_type=fmp4:hls_time=4:hls_list_size=0:hls_segment_filename=/var/www/area51-process1.somesite.com/html/v/OHE4f9WSezA-078f9ec1-2f2b-4a6b-a34d-a8c9d4c39d7b-360p-segment.mp4]/var/www/area51-process1.somesite.com/html/v/OHE4f9WSezA-078f9ec1-2f2b-4a6b-a34d-a8c9d4c39d7b-360p.m3u8|[select='v:1,a':f=hls:start_number=0:hls_flags=single_file:hls_playlist_type=vod:hls_segment_type=fmp4:hls_time=4:hls_list_size=0:hls_segment_filename=/var/www/area51-process1.somesite.com/html/v/OHE4f9WSezA-078f9ec1-2f2b-4a6b-a34d-a8c9d4c39d7b-480p-segment.mp4]/var/www/area51-process1.somesite.com/html/v/OHE4f9WSezA-078f9ec1-2f2b-4a6b-a34d-a8c9d4c39d7b-480p.m3u8|[select='v:2,a':f=hls:start_number=0:hls_flags=single_file:hls_playlist_type=vod:hls_segment_type=fmp4:hls_time=4:hls_list_size=0:hls_segment_filename=/var/www/area51-process1.somesite.com/html/v/OHE4f9WSezA-078f9ec1-2f2b-4a6b-a34d-a8c9d4c39d7b-720p-segment.mp4]/var/www/area51-process1.somesite.com/html/v/OHE4f9WSezA-078f9ec1-2f2b-4a6b-a34d-a8c9d4c39d7b-720p.m3u8"

  


  


• 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...) ?