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• FFmpeg : How to convert horizontal video 16:9 to vertical video 9:16, with blurred background on top and bottom sides

  13 janvier 2016, par gomezo

  I know there is a post to do the contrary :
  FFmpeg : How to convert vertical video with black sides, to video 16:9, with blurred background sides

  but i can’t figure out how to do this with ffmpeg

  here is the input :

  

  and here is the expected result (the background video should be zoomed with the same aspect ratio, cropped to 9/16 and blurred) :

  

  Thanks for your help !

• Filter the video while keeping the bitrate (FFmpeg) [migrated]

  20 décembre 2013, par Timofey

  For experimental purposes, I need to filter my video (using -vf option) and change, say, brightness, but keep the same bitrate as in original video.

  Just for testing purposes, I change RGB values to make video completely black using line like this :

  ffmpeg -i input.mp4 -vf lutrgb='r=0.0*val:g=0.0*val:b=0.0*val' output.mp4

  So far, I tried to specify bitrate manually by adding -b, -minrate/maxrate and -q options to this line, but no matter what I do, FFmpeg keep reducing the br of the output video to just a few kilobytes.

  And my question is - if it's possible to keep bitrate on the same level even if if I change RGB values to be completely black (as an extreme case).

• Converted mp4 not displaying image which was added with FFMPEG [duplicate]

  3 décembre 2015, par Avi

  This question already has an answer here :

  • ffmpeg PNG to mp4 - Black screen
    
    1 answer
    

  I am converting a mp3 to a mp4 and simultaneously adding an image to it using FFMPEG.

  Here is the command I am using.

  ffmpeg -loop 1 -i ../image.jpg -i "track 1.mp3" -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest -vf scale=800:400 "track 1".mp4

  The image appears when the video is played in a web browser. However, it doesn’t appear when the video is played on Windows Media Player or on QuickTime.

  Any ideas why ?