[FFmpeg-user] Documentation and feature request

Paul B Mahol onemda at gmail.com
Mon Apr 15 16:59:25 EEST 2019

On 4/15/19, Michael Koch <astroelectronic at t-online.de> wrote:
> Hi all,
> over the last months I've collected a list what's missing in FFmpeg's
> documentation.
> At the end of the list there are a few feature requests.
> 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.

More information about the ffmpeg-user mailing list