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• How to merge two videos, so that the scale of the video takes up 50% of the size of the output video

  3 avril 2023, par Gadzhimurad Radzhabov

  How to merge two videos, so that the scale of the video takes up 50% of the size of the output video.

  


  For example I need to merge two videos so that one half of the video takes up 50% of the output video size from the top and the other half takes up 50% of the output video size from the bottom.

  


  i.e. to divide both video halves in the output video !

  


  Example of such video youtube.com/shorts/InBFBwkUsgI

  


  I tried to ask questions GPT but did not get a normal answer, that is, I do not know how to implement it in general heard that you can implement through vstack

  


• Would compressing the extracted source images of a video and reconstructing it make the video smaller ? [closed]

  9 septembre 2022, par tawfikboujeh

  I discovered squoosh and found out that it does crazy compression on images,

  


  Squoosh only works on images and i wanted to scale it to work on videos.

  


  I then wrote this script to convert the video to a set of images that I'll squoosh and then reconstitute to a video again using the almighty ffmpeg.

  


  mkdir out ; rm -rf ./out/*
ffmpeg -i input.mp4 -r 25 buffer.mp4 # for a reason, i needed to create a buffer, this is hacky, but whatever.
ffmpeg -i buffer.mp4 -vf fps=25 out/out%d.png # convert the image into images
squoosh-cli --mozjpeg '{quality: 75}' out/*.png # compress
FRAMERATE=$(ffmpeg -i buffer.mp4 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p") # get the framerate from buffer video
ffmpeg -framerate $FRAMERATE -i out/out%d.jpg output.mp4 # reconstitute the video knowing the framerate and having the compressed images


  


  the images are 90% smaller but the video has a bigger size than the original one.

  


  benchmarks :

  


  for the images :

  


  1.jpeg : 98 KB on disk
1.png : 1,7 MB on disk 


  


  for the videos :

  


  input.mp4 : 20 Mb on disk
buffer.mp4 : 21 Mb on disk
output.mp4 : 19 Mb on disk


  


  Any idea compressing the source images would make the video smaller ?

  


• FFMpeg merge video and audio at specific time into another video

  21 juillet 2021, par Lug Ia

  I have a standard mp4 (audio + video)
I am trying to merge a 1.4 second mini mp4 clip into this track, replacing the video for the length of the mini clip but merging the audios together at a specific time

  


  Would anyone know how to do this using ffmpeg ?

  


  I've tried quite a few different filters, however can't seem to get what I want

  


  
                          V <------->
miniclip.mp4              A <=======>
             V <----------->  ↓ + ↓  <--->
standard.mp4 A <=========================>