On 05-08-2018 06:41 PM, Michael Koch wrote:
I'd like to ask if it's possible to make an exponential decay effect
with FFmpeg.
Let's assume a pixel is fashing to luminance = 1 in just one frame. Then
in the output video I'd like to have the pixel flashing to 1
immediately, followed by an exponential decay with a time constant of a
few seconds.
The mathematics would be something like this:
luminance = 0.95 * luminance_in_last_frame; // exponential decay
if (luminance_in_new_frame > luminance)
luminance = luminance_in_new_frame;
So,
frame 0 --> luminance 0
frame 1 --> luminance 1
frame 2 --> as per exprs above
...
frame 2+T --> "
frame NEXT --> source luminance
...
frame LAST --> "
?
Or would the exponential decay restart each time a pixel of lum 1 is
encountered?
Gyan
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