[FFmpeg-user] Documentation and feature request

Michael Koch astroelectronic at t-online.de
Mon Apr 15 17:34:42 EEST 2019

Am 15.04.2019 um 15:59 schrieb Paul B Mahol:
>> Feature request:
>> -- Decay filter, makes short flashes of light appear longer, with an
>> exponential decay curve. Like on an analog oscilloscope screen with long
>> persistence time. Could be used for videos of the night sky to make fast
>> meteors appear longer. Should work as follows:
>> For each pixel do:  Multiply the RGB values from the previous output
>> frame with a decay constant in the range [0..1], for example 0.95. Use
>> these RGB values for the next output frame. But if the RGB value from
>> the next input frame is brigher than this, then use the brighter value.
> I'm not sure about "decay" name for filter.
> Decay is usually something else.

Please feel free to use a better name. I don't care about the name. You 
understood how it should work?


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