[FFmpeg-user] Filter for smoothening gradual luminance changes?
tavasti at tavasti.fi
Sun Apr 16 15:08:30 EEST 2017
I have tried to find out proper way to smoothen luminance changes on
videos of sunset. Cameras are action cameras where it is not possible to
set manually exposure etc, and in fact, it is not desirable. Typically
my video recordings are few hours, from full daylight, sun shingin
towards camera, and endig to darkness. So exposure changes gradually,
but problem is that on such cameras, change is annoying clear, sudden
change. Therefore, I'd like to smoothen that so that it is not that sudden.
See example what I mean https://youtu.be/vOVYZAcWpZE?t=23s
Video is shot as normal video, and then speeded up with ffmpeg. If video
would be done from pictures, then it is possible to change luminance of
each picture to match to average of surrounding pictures, but cameras I
use don't support taking pictures with given interval or provided
intervals are too long. Therefore making 'timelapse' from video is needed.
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