Lots of Heatmaps

using AbstractPlotting

function makeheatmaps(bufs)
    heatmaps = map(bufs) do buf
        heatmap(
            buf, padding = (0,0), colorrange = (0,1),
            axis = (names = (axisnames = ("", ""),),)
        )
    end
    scene = hbox(map(i-> vbox(heatmaps[i, :]), 1:size(bufs, 1))...)
    scene, last.(heatmaps)
end
datarows = 500; datacols = 500
plotrows = 4; plotcols = 4
bufs = [fill(0.0f0, datarows, datacols) for _ in 1:plotrows, _ in 1:plotcols]
scene, hms = makeheatmaps(bufs)
N = 100
record(scene, "output.mp4", 1:N) do i
    for (hm, buf) in zip(vec(hms), vec(bufs))
        buf .= rand.(Float32)
        hm[1] = buf
    end
    yield()
end