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#!/usr/bin/env lua
function hue2rgb(hue)
local h = hue * 6
local x = math.floor((1.0 - math.abs(h % 2.0 - 1.0)) * 255)
return table.unpack(({
{255, x, 0},
{x, 255, 0},
{0, 255, x},
{0, x, 255},
{x, 0, 255},
{255, 0, x},
})[math.floor(h)+1])
end
local fps = 25
local dur = 2
local out = "discooverlay.mkv"
local encoder = io.popen("ffmpeg -f rawvideo -pixel_format rgb24 -video_size 1x1 -framerate "..fps.." -i - -y "..out, "w")
local total = fps*dur
for i = 0, total-1 do
encoder:write(string.char(hue2rgb(i/total)))
end
encoder:close()
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