Tuesday, January 1, 2019

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

Thursday, December 27, 2018

Astronomy and meeting nice random people in Sydney, Australia

While visiting in-laws in Sydney, Australia, I woke up very early on December 25, 2018, and took a walk to try to look at stars that are only visible in the Southern hemisphere.  I ended up meeting some very nice people in a park from Venezuela and Chile!  It was magical to be out in the city at such an odd hour and have the feeling of discovery by looking both around and up.

Sunday, September 16, 2018

Failed attempt to rebuild raspberry pi filesystem (ext4)

My raspberry pi failed to boot, and I tracked it down to being a damaged main linux partition.&nbsp; I tried to repair the partition, but it didn't work.&nbsp; This posts lists some of the things I tried for posterity.

Sunday, July 29, 2018

Trip to NYC to visit Tuukka and watch Anjunadeep Open Air

My friend Tuukka was going to be nearby - in NYC* - so he invited me down to hang out while he filmed Yotto (deep house DJ) perform at Anjunadeep Open Air at the Brooklyn Mirage.  It was an amazing experience ...

* he's from Helsinki, so that is relatively nearby)

Sunday, March 4, 2018

Setting up samba share on raspberry pi

I wanted to have a samba share of the RAID on my raspberry pi, I was able to do it quite quickly using the instructions here:
https://wiki.debian.org/SambaServerSimple

The main thing I had to do that was not in the above instructions: install the package samba-common-bin in order to have smbpasswd; not sure why it wasn't installed by default, perhaps that is a difference between the debian version those instructions and the version of raspbian I'm running.

I ran into an apt-get upgrade error during the process that was probably unrelated but for completeness: it had to do with exim4, fix meant moving all exim4-* from /var/lib/dpkg into a temp location, then running:
sudo dpkg --configure -a
sudo apt-get update
sudo apt-get upgrade
I was able to connect my mac laptop to it immediately from the finder --> Go --> Connect to Server (command-K), then using this for the server address:
smb://piB/mraid
piB is the address of the raspberry Pi (I've edited /etc/hosts on my laptop to use that) and mraid is the name of the share I configured on the samba server on the raspberry pi in /etc/samba/smb.conf ([ourfiles] in the link above).

Sunday, January 7, 2018

Dry stout from dried malt extract and a mash

I originally intended to make a dry stout from dried malt extract, but when I realized I didn't have enough extract, I decided to try doing a mash of what grain I had available to make up the balance of sugars. The results:

Sunday, December 31, 2017

Grapefruit Mead*

* technically it's called a melamel when you add fruit to a mead

Following up on previous mead brewing attempts, I decided to attempt a mead flavored with grapefruit.  Basically I followed Charlie Papazian's recipe from The New Complete Joy of Home Brewing, p. 344 "Antipodal Mead".  What I used: