[FFmpeg-user] Filter for smoothening gradual luminance changes?

[Paul B Mahol]

On 4/18/17, Moritz Barsnick <barsnick at gmx.net> wrote:
> On Tue, Apr 18, 2017 at 10:45:24 +0300, Markku Tavasti wrote:
>> One option is to write all frames as pictures to disk, and then run
>> timelapse-deflicker.pl for them, and make video from those pictures.
>> However, that will take much time and disk space.
>
> Only after looking at that script[*] (and the lovely videos of course) do
> I understand your intent: The brightness shall follow a rolling average
> of sorts, i.e. be more or less monotonic (wrong term, I know).
>
> I'm pretty sure that ffmpeg can't do that, as I know of no filter which
> will create such an average and apply it. But a filter could be
> written... I don't know if it would be a candidate for upstream though.

I just wrote deflicker filter.

>
> (I'd be willing to try, but my filter writing learning skills are stuck
> at a different attempt. ;-))

Which attempt?

>
> [*] https://github.com/rambo/timelapse/blob/master/timelapse-deflicker.pl
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