Time-lapse videos of Sydney, Australia skyline during sunrise / sunset

I created some time-lapse videos of the Sydney skyline during sunrise and sunset.  This one is my favorite because you can see a clouds moving, a star appear and move, and a plane:

https://www.youtube.com/watch?v=Vfu9yXc8yt8

(best with HD / full screen)


Here's one during sunrise when you can see pink clouds, dew drops form and roll down the ledge, and regular clouds move across the sky:

https://www.youtube.com/watch?v=Sqwn72vfwo4

This last one is a bit shakier than the others, but I really like the colors:
https://www.youtube.com/watch?v=m_QyVevW3Dw

Apologies for the changing brightness - lesson learned, need to set the camera to full manual mode to try to avoid that.

As in previous cases I created the videos using ffmpeg with e.g.

ffmpeg -r 30 -f image2 -s 1280x720 \
    -i ordered_symbolic_links/png_snapshot_%04d.png \
    -vcodec libx264 -crf 25 -pix_fmt yuv420p test2.mp4

from:  https://trac.ffmpeg.org/wiki/Concatenate#samecodec

Edit:  could not by default upload these videos to instagram - turned out the format is OK, needed to rescale so width was <= 1080.  I did that using:

ffmpeg -i 2018-12-30_surry_hills_sunset_timelapse.mp4 -vf scale=1080:720 2018-12-30_surry_hills_sunset_timelapse_scaled.mp4

from:  https://trac.ffmpeg.org/wiki/Scaling