Aurora Borealis (Northern Lights) in Tromsø

To celebrate my fiftieth birthday the whole family had a great vacation in Tromsø to see the northern lights.

The following videos where all taken using a wireless remote control with programmable interval.

The single shots where joined using ffmpeg.

#!/bin/sh
# $1 = framerate (for aurora timelapse use 1 to 4)
# $2 = start number of first image
# $3 = output file (with .mp4 extension)

ffmpeg -y -r "$1" -start_number "$2" -i IMG_%04d.JPG -s hd1080 -vf "framerate=fps=30:interp_start=0:interp_end=255:scene=100" -vcodec mpeg4 -q:v 1 "$3

In a few cases the images where a bit underexposed and needed to be brightened.
This was done with a simple shell script using the imagemagick convert.

#!/bin/sh

mkdir modulate150

for i in *.JPG
do
        convert $i -modulate 150% modulate150/$i
done