The One with the Thoughts of Frans

KOReader Beta 20180314

As one of the maintainers of KOReader, a versatile a document and image viewer for E Ink devices, I’m proud to announce the latest release.

This release adds support for the Kobo H2Ov2 thanks to @cairnsh. You need to use at least KSM 9 with update 1.

@dengste added a widget to configure the natural light on the Kobo H2Ov2 and the Kobo Aura One in #3744.


The Android x86 build is now a regular part of the nightly builds (see #3384 but it wasn’t finalized on the build server until koreader/koreader-misc#14).

We’d like to thank all contributors for their efforts. Some highlights include:

Full changelog


Improving Gource Videos with Background and Audio

Gource videos have been popping up on my radar for several years now, but for some reason I decided to play around with it yesterday. My tweaks were very minor: much increased speed, avatars, a logo, a background image, and some music to go along with it.

I started with the avatars. To grab them, I used this script with a quick replacement for the error handling:

    if($rc != 200) {

        my $gh_url = "".$author."?size=".$size; 

        warn "fetching gh image for '$author' $email ($gh_url)...\n";

        my $rc = getstore($gh_url, $author_image_file);


That way users without Gravatars but a GitHub username in their commit message still get the one you’re used to seeing. I manually deleted all of the default GitHub no avatar images. That sounds like a lot of work, but you can just sort by size.

I did a quick inversion of the KOReader logo in GIMP. Nothing special there.

The background image I grabbed from Pixabay, a useful site for free photographs. The music I got from, something similar for music.

Now for the pièce de résistance, thanks to the Gource wiki:

gource -1920x1080 -a 0.1 -s 0.05 -i 0 --logo koreader-logo-inverted.png --user-image-dir .git/avatar/ --background-image fairyland-canyon-1632749_1920.jpg -o - | ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i - -vcodec libx264 -preset ultrafast -pix_fmt yuv420p -crf 1 -threads 0 -bf 0 gource.mp4

The most important aspect is the resolution and how fast or slow you want the video to be. Then once you have the video, you can mix in the audio:

ffmpeg -i gource.mp4 -i mindmapthat_-_Transmutation.mp3 -c:v copy -c:a aac -strict experimental -filter:a "volume=0.6" gource-muxed.mp4

Note that I lowered the volume of the music, more on that here. You could also play around with fade-outs, whether in Audacity or straight from ffmpeg. Also see my post on lossless audio cutting for when everything is good but you just want to trim the audio a little. That’s all!

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Six Years of KOReader

This is a little experiment with Gource. Direct link to video here. KOReader is a document viewer for E Ink devices. It supports PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, EPUB, DOC, MOBI, and ZIP files. It currently runs on Kindle, Kobo, PocketBook, Ubuntu Touch and Android devices. More information here.



Music: Transmutation by Kara Square (c) copyright 2017 Licensed under a Creative Commons Attribution (3.0) license. Ft: Spinningmerkaba

Also see…

Back in 2015 Landon Wilkins uploaded a visualization here.

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KOReader Nightly 20180212

As one of the maintainers of KOReader, a versatile a document and image viewer for E Ink devices, I’m proud to announce the latest release.

Special thanks to @dengste this month for adding natural light support on the Kobo Aura One (#3679).

You can control the natural light feature on the Kobo Aura One through the regular frontlight widget and the frontlight gesture controller. The latter allows for controlling warmth by swiping on the right of the screen, and is accessible via ToolsMore pluginsFrontlight gesture controller.

Those who read two-column papers might like the new two-column navigation (@FranMarelli This does not work in conjunction with scroll mode.

Those willing to experiment can try the new Open with… option (#3651).

Finally, a little clarification on last month’s HTML dictionary support. We use MuPDF to render the HTML dictionary results. Unfortunately, MuPDF expects its input to be well-formed XHTML, meaning XML. When the HTML is tag soup instead, KOReader will fall back to a stripped version of the HTML dictionary entry. Should this be the case, you can manually fix up the output by adding a .lua file in the dictionary directory. Further details and a few examples are provided by @poire-z in #3611.

We’d like to thank all contributors for their efforts. Some highlights include:

  • Fix speedup of dictionaries init (@poire-z
  • Swipe down or tap on top left/right to access left/right reader menu tab directly (@nagyation
  • Menu: configure number of items per page, wrap entries (@robert00s
  • OPDS – add confirm when file exist in local destination (@robert00s
  • HTML dictionary link support (@TnS-hun
  • Update History and Last open document when move (cut and paste) file (@poire-z
  • Do not execute background runner if device is suspended (@Hzj-jie
  • [feat] Add NetworkManager:isConnected() (@Frenzie
  • Filemanager – sort by percent of book (@robert00s
  • [UX] Move “Go back to previous location” up one menu level (@Frenzie
  • Wikipedia: show images and allow interrupting queries (@poire-z
  • luasettings: backup previous file and auto-recover (@poire-z
  • epub metadata: support multiple authors (@poire-z
  • HtmlBoxWidget: fix selection when starting from end (@poire-z
  • Bump base: fix gray background instead of white on Kindle (@poire-z
  • Add MovableContainer: allow moving some widgets (@poire-z
  • Add menu item for toggling auto_book_status (@poire-z
  • [UX] Dict: scroll back with tap: go to bottom of prev definition (@poire-z
  • NewsDownloader: better exception handling and basic redirects (@mwoz123
  • [feat] Open with: choose which engine to use for file (@Frenzie
  • Menu: speed up rendering of long texts (@robert00s
  • cre full text search: fix inconsistencies (@poire-z
  • kobolight.plugin: Support for setting natural light (@dengste
  • Show vertical marker at original position when back from link (@poire-z
  • File manager: added ‘Go to letter’ (@robert00s
  • cre cache: allow for disabling compression (@poire-z
  • [feat] Two-column navigation (@FranMarelli
  • [fix] larger max font size for crengine (@Frenzie

Full changelog