You Can Just Concatenate MPEG-2

To deal with the inferior FAT file system, it would seem that consumer-level Sony video cameras write video files of a maximum of about 2.1 GB. A sensible approach, but annoying to work with. Luckily they can be concatenated without any concerns or side effects for easier viewing and editing.

cat 00006.MTS 00007.MTS 00008.MTS > output.mts

For other video formats, see the ffmpeg FAQ.

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Launcher with parameters in Xfce

Back in November I decided to try Aard 2 on my laptop. I followed the instructions and it worked. Then I created a launcher with the following command and suddenly it did not.

java -Dslobber.browse=true -jar ~/programs/aard2/aard2-web-0.7.jar ~/programs/aard2/slobs/*.slob

A different strategy, passing a command to Bash, did the trick.

bash -c "java -Dslobber.browse=true -jar ~/programs/aard2/aard2-web-0.7.jar ~/programs/aard2/slobs/*.slob"

Enjoy your fully functional launcher! 😉

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Qalculate!, My New Favorite Calculator

Over the past few years I acquired a bad habit of using search engines for basic calculations and conversions. I’m not talking about the stuff you should just do in your head — not quite that bad, but about the fact that several Linux distros, including my favorite of Debian Xfce, don’t seem to ship with a calculator by default. So I finally got around to testing some programs and Qalculate! does all I want. You can install it on Debian using sudo apt install qalculate-gtk. There’s a list of features on the website. Enjoy a few screenshots.

qalculate-conversion-celsius-fs8
Celsius to Fahrenheit.
qalculate-conversion-km-fs8
Kilometer to mile.
qalculate-conversion-money-fs8
Euro to Dollar.

I hope you’ll like it too!

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libGL error in Steam and Broken Age in Debian Stretch

After some update or other, Broken Age refused to start.

$ ./start.sh 
Running Broken Age
libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  155 (GLX)
  Minor opcode of failed request:  3 (X_GLXCreateContext)
  Value in failed request:  0x0
  Serial number of failed request:  91
  Current serial number in output stream:  92

Oh well, let’s give it a little hand, shall we?

LD_PRELOAD='/usr/lib/i386-linux-gnu/libstdc++.so.6 /lib/i386-linux-gnu/libgpg-error.so.0' ./start.sh

This loads the included libraries before any others, in order to override the incompatible libraries shipped with the program in question. The same trick also works for Steam. If gaming is your goal, you should probably stick to whatever version of Ubuntu is supported best. I’m just pleased that I can play the occasional game like Oxenfree (no preloading required, mind you) or Broken Age on my workhorse without having to install any stability-reducing binary blobs.

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Fix No gksu(do) Permissions Prompt on Gparted, Synaptic, Mounting Drives, Etc. in Debian

I run Debian Stretch (testing) as my daily driver, and at some point I stopped being able to start programs like start Synaptic, Gparted, Synaptic etc. without manually typing gksu(do). The solution is as simple as it is seemingly unnecessary and stupid:

sudo apt install policykit-1-gnome

The problem is apparent upon reading the description:

This implementation was originally designed for GNOME 2, but most
GNOME-based desktop environments, including GNOME 3, GNOME Flashback,
MATE and Cinnamon, have their own built-in PolicyKit agents and no
longer use this one. The remaining users of this implementation
are XFCE and Unity.

Reported as Debian bug #843224. My first?


D’oh, I wrote this on November 5, 2016. I’ll still publish it anyway in case it’ll still help someone searching for a solution.

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Workarounds for Turning Off Your DisplayPort Monitor

Sometimes you jot down a few quick notes for yourself without bothering to turn them into a blogpost that might be useful to others. This is one of those notes. First, I’ll introduce my computer monitor workflow as it’s been since time immemorial, also known as ’95 or ’96. Just like how I turn off lights I don’t use, I’ve always turned off my monitor when I wanted it. This has never been a problem, until in early 2015 I had to use DisplayPort for the first time. If you want an UltraHD monitor, which you do if you care even the tiniest bit about sharpness and clarity, you have to use DisplayPort.

But DisplayPort isn’t nice. Turning off your monitor is treated the same as disconnecting it. In Windows this means everything resets itself to some absurdly low resolution, whereas in Linux the consequences can be even worse (like having to SSH in from another computer to run an xrandr command to reactivate the monitor). This means you either face a colossal waste of energy or continuous annoyance at the fact that your monitor has turned itself off yet again. In my view monitor timeouts should be at least twenty minutes, just as a failsafe in the extremely unlikely event that you forgot to turn it off. Luckily I found two reasonable workarounds within the first week or two of having acquired my UHD monitor.

The first?

xset dpms force off

This has the same effect as your monitor timeout, only at your volition. I tend to find the blinking light on the monitor somewhat annoying, but this nevertheless remains your best bet to quickly turn the screen off as part of your regular workflow.

The second method consists of actually turning the monitor off. Besides getting rid of the blinking light I figure it saves just a tiny bit more electricity to boot. Which is useful if you want to keep your computer active, but not your monitor. For this method you have to switch to TTY (Ctrl + Alt + F1-6) before turning your monitor off. Then when you turn your monitor back on, X won’t know it’s been missing. Switch back with Ctrl + Alt + F7.

I’m still hopeful that there might simply be an xorg.conf setting I’ve overlooked, but in any case these workarounds serve their purpose. Note that xset dpms force off is also tremendously useful on laptops that don’t have a function key for turning off the screen. Standby often just isn’t what you want.

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Scanning with an HP MFP (multi-function peripheral) on Debian

You need to install hplip. It looks like something’s still off about the colors compared to Ubuntu and Windows, and I can’t figure out what the difference is. Alas. :/ Also, don’t buy HP.

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Less is More

A minimal Debian install comes without the ability to view man pages. Fair enough, it’s minimal after all. But they can be quite useful. A sudo apt install man later results in man pages being shown. That’s all, folks? Unnfortunately not, because the man pages are shown using the more command, which doesn’t allow for scrolling up and down with the arrow keys or j and k, Pg Up and Pg Dn, and all the other usual niceties. To fix you need to sudo apt install less, a “pager program similar to more.” And better, at least on any machine with sufficient RAM. Meaning anything anyone is likely to use in 2016, or probably also in 1990 for that matter.

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Let’s Encrypt on Debian/Jessie

Wow, that was easy. I’ve been reading about Let’s Encrypt all over the place, and I wouldn’t like any snooping on my feeds password, now would I?

  1. Add the jessie-backports repository.
  2. sudo apt install -t jessie-backports certbot python-certbot-apache
  3. sudo letsencrypt --apache -d example.com [-d subdomain.example.com]

This stuff expires every 90 days, so you still need a cron job to renew.

sudo crontab -e

Let’s say 4 at night every Sunday.

* 4 * * 0 letsencrypt renew >> /var/log/letsencrypt-renew.log

Neat!

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xorg.conf: EmulateWheel stopped working on libinput update

I didn’t spot it in the Debian changelog, but apparently the latest libinput10 update on Debian/stretch (unstable) broke my EmulateWheel option. Because the scroll ring on my trackball is broken, it’s all I’ve got. It’s also rather nice on trackballs without any kind of scrolling functionality at all, such as the Logitech Trackman Marble.

Let’s start by examining my current xorg.conf:

$ cat /etc/X11/xorg.conf 
Section "InputClass"
	Identifier	"Kensington Trackball"
	MatchProduct	"Kensington Expert Mouse"
	Option		"SendCoreEvents" "True"
	Option		"ButtonMapping" "0 1 2 4 5 6 7 3"
	Option		"EmulateWheel" "True"
	Option		"EmulateWheelButton" "1"
EndSection

Scanning man libinput doesn’t list any entries for those options anymore, but it does contain the following:

Option "ScrollButton" "int"
Designates a button as scroll button. If the ScrollMethod is button and the button is logically held down, x/y axis movement is converted into scroll events.
Option "ScrollMethod" "string"
Enables a scroll method. Permitted values are none, twofinger, edge, button. Not all devices support all options. If an option is unsupported, the default scroll option for this device is used.

Note how this would allow you to disable two-finger scroll on e.g. our Wacom drawing tablet if you don’t like it. (But I do!) In any case, adjusting my xorg.conf accordingly:

Section "InputClass"
        Identifier      "Kensington Trackball"
        MatchProduct    "Kensington Expert Mouse"
        Option          "SendCoreEvents" "True"
        Option          "ButtonMapping" "0 1 2 4 5 6 7 3"
        Option          "ScrollMethod" "button"
        Option          "ScrollButton" "1"
EndSection

Works like a charm. Better yet, it now also scrolls horizontally. Which can be disabled with Option "HorizontalScrolling" "false" if you so desire. All’s well that ends well.

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