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• ffmpeg how to determine the size of the image and stretch the video to fit it ?

  11 décembre 2020, par Артем

  I want to automatically detect the size of the image and stretch the video to fit it.
  
I have images of different sizes.
  
There is a video with a green background one size.
  
I remove the chromakey and overlay the image.
  
But I have a problem, my video is of a different size.
  
Me need to automatically expand or contract it to the size of the image.
  

  


  @echo off
setlocal EnableDelayedExpansion
color a
set a=Your_files\*.jpg
set aa=Your_files\*.mp4
set b="Result\%%~na.mp4"
set c=ffmpeg
set f=-filter_complex "[1:v]chromakey=0x00D700:0.1:0.3[ckout];[0:v][ckout]overlay=(W-w)/1:(H-h)/1[o]" -map [o] -map 1:a -c:a copy
for %%s in (%aa%) do !set aud="%%s"!
for %%a in (%a%) do (%c% -y -i "%%a" -i %aud% %f% %b%)
exit


  


  Help me please
  

  


  Bad idea.. Images can be of different formats. (there will be distortion)
  

  


  


  Me only one thing comes to my mind.
  
Separately resize the image.
  
Separately resize the video.
  
And then work with them...
  

  


  


• How to draw - dynamic - "safe areas" in ffplay

  16 juin 2023, par F.O.R.A.R.T.

  we need to preview videos with overlayed so-called "safe areas" according to this EBU document : SAFE AREAS FOR 16:9 TELEVISION PRODUCTION.

  


  Here's the scheme for 1080p resolution :
1080p Safe Areas

  


  Those consist of three different "zones", each with the same percentage size-to-the-edge of the video frame for any resolution :

  


  

  • Action Safe Area (GREEN box) : 3.5%

  


  • Graphics Safe Area (RED box) : 5%

  


  • 4:3 Safe Area (GREY box) : 16.25%

  


  


  It should be easily achieveable using the drawbox command, but how can be dynamically adapted to any video resolution ?

  


• how to change ffmpeg xstack background color

  17 août 2021, par Abdelsalam ElTamawy

  I creating a 2x2 grid of videos but only had 3 videos. So I created an xstack of these 3 videos. The bottom right corner does not get a video. This causes it to be left to FFmpeg default colour.

  


  Here is the command I use to create the video mosaic :

  


  ffmpeg -i TEST.mkv -i TEST.mkv -i TEST.mkv -filter_complex "
[0:v] scale=960x540 [a0];
[1:v] scale=960x540 [a1];
[2:v] scale=960x540 [a2];
[a0][a1][a2] xstack=inputs=3:layout=0_0|0_h0|w0_0[out]"
 -map "[out]" -f matroska - | ffplay -


  


  

  


  How can I make the green corner black or any other colour ?

  


  I'm using FFmpeg version 4.4