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• how to resize and keep video keep aspect ratio and pad with black bars [duplicate]

  20 septembre 2017, par Sepehr Norouzi

  This question already has an answer here :

  • Use ffmpeg to generate video thumbnail without any distortion
    
    2 answers
    
  • FFMPEG (libx264) “height not divisible by 2”
    
    4 answers
    

  I need to resize my video with ffmpeg.

  It’s MP4 with width 640 and height 360. How can i resize it and keep aspect ratio and pad with black bars so that the video size is exactly ... ?

  I already tried some codes on Linux but it just damages file.

• ffmpeg overlays the video on the background video and deletes the black background of the original video

  4 avril 2023, par codecapture

  I use this command to remove black background

  


  ffmpeg -i bg.mp4 -i video.mp4 -filter_complex [1:v]colorkey=0x000000:0.1:0.1[ckout];[0:v][ckout]overlay[out] -map [out] -t 5 -c:a copy -c:v libx264 -y result.mp4


  


  enter image description here
The black color on the person in the original video will also be removed, how to solve it ?

  


• FFMpeg set alpha channel transparent for black pixels

  1er avril 2023, par Pete

  I'm using ffmpeg for a bunch of my video workflows. I need to learn how to replace the alpha channel for the black pixels to be transparent. The video I'm working with is ProRes 4444. Here is a link to a
Sample video file. It seems it should be easy but I'm having a hard time figuring out how to do it. Thanks in advance for helping !