FFmpeg 5.0.3
Since* 4.2
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Slowly update darker pixels.

This filter makes short flashes of light appear longer. This filter accepts the following options:

decay

Set factor for decaying. Default is .95. Allowed range is from 0 to 1.

planes

Set which planes to filter. Default is all. Allowed range is from 0 to 15.

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Commands

This filter supports the all above options as commands.