Things I Read

Severe #Hydrogen impact on #climate.

We learnt this at university in the 90ies, but big money does not listen. Steam from water, vapor, mist are much more greenhouse gas than others. Especially on local levels, like urban micro climate (think of a million cars steaming water in the air) but also on higher layers. Read this. ATM there’s no valid path around public transport and electric vehicles. Good-bye, privately owned combustion engine. That includes fuel cells.

“we have also considered, for the first time, previously ignored changes in stratospheric [that is, in the second-lowest layer of the atmosphere] water vapour and stratospheric ozone in our calculations of hydrogen’s GWP,” “

https://www.rechargenews.com/energy-transition/hydrogen-twice-as-powerful-a-greenhouse-gas-as-thought-before-uk-government-study/2-1-1200115

Things I Read

Setting up four monitors on a Linux laptop via script

Although KDE discovers the three external monitors and the built-in display perfectly, I need this alias sometimes because the thunderbolt doc gets confused when I change the laptop attached to it: 

#:~> alias monitors
alias monitors=’xrandr –output eDP –output DisplayPort-1 –output DisplayPort-2 –off –output DisplayPort-3 –off –output HDMA-A-0 –off; xrandr –output DisplayPort-3 –mode 1920×1080 –output DisplayPort-1 –primary –mode 1920×1080 –right-of DisplayPort-3 –output HDMI-A-0 –mode 1920×1080 –right-of DisplayPort-1 –output eDP –mode 1920×1080 –below HDMI-A-0′
#:~>

(Yes, it’s an L-shaped Setup on my desktop)

Linux and OSS hints

#bipbip the #lucaapp remix loop (12” version 10:00)

#bip, #bipbip, #bipbipbip, #loop. Mit ffmpeg rumspielen, schabernack. Aber gerade die 10-Minuten-Dauerbeschallung ist so realitätsnah, irgendwie. #zusammenrottung. 

Hier die Videos, die Anleitung steht unten: 

BIP:

BIPBIP:

BIPBIPBIP:

BIPLOOP:

Bash HOWTO:

Die Schöpfungshöhe ist ja fragwürdig, bei dem hier, weil das unter #Linux so einfach geht. Erstmal habe ich den mit meinen GEZ-Geldern finanzierten, von den steuerfinanzierten Luca-App-Machern auf Youtube veröffentlichten Quelltext heruntergeladen. Ja, da ist noch ein wenig Overhead in Form von Bildern dabei, aber die entfernen wir später: 

mfeilner@:~> youtube-dl “ytsearch:Smudo Luca Maischberger Woche”     
[download] Downloading playlist: Smudo Luca Maischberger Woche
[youtube:search] query “Smudo Luca Maischberger Woche”: Downloading page 1
[youtube:search] playlist Smudo Luca Maischberger Woche: Downloading 1 videos
[download] Downloading video 1 of 1
[youtube] r66-5cDbNAE: Downloading webpage
[youtube] r66-5cDbNAE: Downloading MPD manifest
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[download] Smudo über Luca bei Maischberger Die Woche am 25.11.2020-r66-5cDbNAE.mkv has already been downloaded and merged
[download] Finished downloading playlist: Smudo Luca Maischberger Woche
mfeilner@al-khwarizmi:~>

Ups, das hatte ich ja schon runtergeladen. 😉 Habt Ihr gesehen, wie die Lucas auch dort alle Kommentare ausgeschalten haben? Da waren wohl wütende Opfer Kunden dabei?
Ok, dann den richtigen Ausschnitt ausschneiden: 2:32 bis 2:33:

ffmpeg -i Smudo\ über\ Luca\ bei\ Maischberger\ Die\ Woche\ am\ 25.11.2020-r66-5cDbNAE.mkv -ss 00:02:32 -to 00:02:33 -c copy bib-raw.mp4

Und im zweiten Nachgang genauer zuschneiden:

ffmpeg -i bip-raw.mp4 -ss 0.2 -to 0.4 -c copy bip.mp4

Aber so ein alleinestehender “Bip” ist doch langweilig, machen wir doch einen #bipbip, einen #bipbipbip und eine 10-Minuten-Loop daraus. 

cp bip.mp4 bip1.mp4; ls bip*mp4 > files.txt; ffmpeg -f concat -safe 0 -i files.txt -movflags faststart -c copy bipbip.mp4

cp bip.mp4 bip2.mp4; ls bip*mp4 > files.txt; ffmpeg -f concat -safe 0 -i files.txt -movflags faststart -c copy bipbipbip.mp4

Und dann machen wir mal 10 Minuten bipbip mit Fade-In und Fade-Out:

fmpeg -stream_loop 1485 -f concat -safe 0 -i fileList.txt -movflags faststart -c copy loop1.mp4

ffmpeg -i loop1.mp4 -af afade=t=in:st=0:d=5,afade=t=out:st=590:d=10 loop.mp4

Und jetzt? Das hält doch keiner aus. Genau wie bei der #lucaapp.

Disclaimer: Dies ist Lernmaterial aus einem ffmpeg / Linux-Kommandozeilen-Kurs.

Things I Read

USA: You can check out anytime… #citizenship

Americans seeking to renounce their citizenship are stuck with it for now

“It’s very taxing. My whole life in Germany is on hold,” he said. “It’s funny: people in Germany tend to see the US as a liberal country where the rule of law was established, but I can’t even find anyone in the US government to talk to.”

https://www.theguardian.com/us-news/2021/dec/31/americans-seeking-renounce-citizenship-stuck

Linux and OSS hints

Linux – Bash Resize, split, Rotate or concatenate PDFs

This has probably been done a thousand times and ways, and much better than my humble fiddling. Consider this my memory pad for later.

I am doing some scripted pdf magic with files that come in from the scanner. They are either too big for web use, wrong format, not the right orientation (user error) or similar. So here’s a little collection:

Convert all (huge) PDFs into small ones with ghostscript (assuming ./Z-OLD for old versions exists):

for i in *.pdf; do gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=$i-small.pdf $i; mv $i Z-OLD/; rename .pdf-small.pdf .pdf *-small.pdf; done

Convert all PNGs in working directory into small PDFs (assuming ./png exists):

for i in *.png; do convert $i $i.pdf; mv $i png/; gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=$i-small.pdf $i.pdf; rename .png-small.pdf .pdf *.png-small.pdf; rm *.png.pdf; done

Concatenate PDFs into one file (the last argument is the new outputfile):

pdfunite A.pdf B.pdf C.pdf ABC.pdf

A lazy “rotate all” script that helps me if I put the paper on the scanner the wrong way. Leaves four versions of every pdf it finds, but 90/180/270° degrees tilted to the original.

#!/bin/bash
INFILE=ls.txt
ls *pdf -1 > $INFILE
while IFS=”²” read -r line
do
PDF=`basename $line | rev | cut -c 5- | rev`
#left turn
pdftk “$line” cat 1-endwest output “$PDF”_left.pdf
#right turn
pdftk “$line” cat 1-endeast output “$PDF”_right.pdf
#turn 180 degrees:
pdftk “$line” cat 1-endsouth output “$PDF”_upsidedown.pdf
done <$INFILE

And yes, I know, there’s better ways. Worx 4 me, I guess. 🙂


Convincing People since 1994. Open Source. Security Theater. Leadership. Journalism.