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  1. Installing Pelican 4

    Pelican is the static site generator that I use for my website. This allows me to write my website posts in almost plain text (actually a light-weight markup language named reStructuredText), which are then translated into HTML. As someone who has written his webpages in HTML by hand, I can …

  2. Creating a nomogram with Python and Postscript

    At work I needed a suitable way to check the calibration of gelcoat spray equipment. Gelcoat requires an initiator (often called “catalyst”) in the form of a peroxide to cure. The peroxide/gelcoat ratio is important, so it is checked regularly by spraying the separate components into suitable containers and …

  3. TeXLive 2018 update

    Today I updated my TeXLive install to 2018. Although the install went fine, there was a problem with the binaries.

    Both asymptote and xetex were linked to different versions of some libraries than those that are supplied by ports. So I had to rebuild them.

    Reason

    Some might wonder why …

  4. Video manipulation with ffmpeg

    Serveral useful recipes for manipulation video with ffmpeg.

    Note that a name within angle brancket (like <this>) represents a generic input or output file.

    Extracting raw audio

    The following recipe extracts the audio from a video file and converts it to WAV format.

    ffmpeg -y -hide_banner -i <input> -vn -c …
  5. Convert RCS history to git

    Before the rise of git, I used rcs as my version control system. Because I want to standardize on git, I am slowly converting old repositories.

    In this article I’ll be converting my old perl scripts in ~/src/perl.

    Create a fast-import stream

    From the existing repo, we create …

  6. Removing big files from git history

    By accident I checked 60-odd full-size photographs into the git history of my website. I shrunk them in a next commit, but the history was still there leading to a bloated .git directory. This took a lot of time when making backups. This documents how I cleaned up this mess …


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