ffmpeg how to apply a vignette to a video

Written by John Riselvato - original link

A vignette is a fade that is added to the edges of an input. It’s a simple way to add atmosphere or emulate vintage television sets. 

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A vignette can be added without additional parameters as seen in figure 62.0:

  $ ffmpeg -i input.mp4 -vf "vignette" output.mp4

The vignette filter also has an angle parameter to adjust the angle of the fade. Below is a vignette with a 30 degree angle:

  $ ffmpeg -i input.mp4 -vf "vignette=angle=PI/6" output.mp4

vignette
    Indicates the vignette filter name

angle, a
    Indicates the angle in radians (PI/2 to 0 with default PI/5)

x0, y0
    Indicates the center coordinates

mode
    Indicates the forward or backward mode (forward or backward)

For more information about additional vignette parameters visit: https://ffmpeg.org/ffmpeg-filters.html#vignette-1