Granjow's blog

Randa meeting 2014

As you have read before, Vincent, Till, and me have met again this year at the Randa Sprint in the Swiss mountains. We have worked on Kdenlive and discussed + partly planned its future.

Read more …

We’re in Randa!

At the moment nearly the whole Kdenlive team is hacking in Randa, Switzerland, at the KDE Sprint 2011. Don’t believe it? Here is the proof:

(From left to right, ttill, xzhayon, j-b-m, Granjow.) So, as you can see, we are totally busy coding and writing the manual. The main activities are:

  • Big refactoring which will improve our code base in terms of maintainability and (for new coders) readability. We created a new branch for the refactoring. When refactoring is complete, we should also be able to write some automated tests.
  • User manual; we are now definitely moving to KDE Userbase which is based on MediaWiki (you all know this from Wikipedia). It will also simplify translation. The first version of the Quickstart tutorial is already online.
  • GIT will be our new version control system at KDE multimedia.

That’s it so far! We’ll go back coding now.
— Your Kdenlive developers

Light Graffiti the 2nd

I’ve slightly improved the Light Graffiti effect, especially for different colours painted over each other. Enjoy :)

Light Painting 2 from Simon Eugster on Vimeo.

Widget layouts in kdenlive

You may probably have noticed that some additional widgets have been added to kdenlive recently. And you probably do not want your kdenlive to look like that:

(Notice that this is on a 1680×1050 screen. You absolutely don't want kdenlive to look like that on an even smaller screen.)

It wont … »

Writing a Light Graffiti effect …

So … this all started when a friend, Melanie, was working on her final paper about Light Graffiti and showed me the video below around mid-September.

Light Painting, also known as Light Graffiti or (partially) Lumasol, is so easy with a photo camera. You take a dark room, use a low shutter speed (several seconds), and paint in the air.

But what about video? You cannot decrease the shutter speed to one frame per minute. Therefore it is not possible.


This really made me think a lot. Actually for several weeks.

After a few minutes of research, I found that the effect used to create the video seems to be kept secret. (At least I couldn’t find any technical information about it.) After some additional research, I read that they actually did this effect in hardware (i.e. programming some camera chip) — but this was after I’d already written this blog post. (Actually, I’m not sure whether it is truely in hardware; some effects suggest that it was done in post as well, like in the part where you only see the light but not the painter.)

Nevertheless, the idea was fascinating, so I decided to start writing an effect frei0r filter that would do the same. It couldn’t be that hard.

That is what I thought at the beginning.

read more »

Introducing Scopes: The Audio Spectrum and the Spectrogram

In the next version of kdenlive you will again find new scopes. This time not for video but for audio! I will also give some tips about audio in general (recording, perception, etc.), not only about kdenlive’s scopes.

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Merry Xmas!

Vectorscope: What the I and the Q lines are good for

In the next kdenlive version (or in the current SVN version, if you dare compile it yourself :)) you will find a new option for the vectorscope: To draw I/Q lines. What are they good for?
Read more … »

Shooting with your DSLR

This article is going to give some tips regarding shooting Video with your DSLR and editing it in kdenlive afterwards.

Camera hardware


Generally Primes are preferred over zooms in video. (Some people, like me, prefer it over zooms as well for photography — but this is a matter of taste and of how you work.) Why that? A psychological reason is that eyes (at least mine) cannot zoom either, so zooming is hardly ever used in video. The technical reason is that Primes are cheaper to build whilst offering better quality: Better sharpness, bigger aperture (for limiting the Depth of Field). Opening the aperture gives you a very nice look. (Please also read ArtInvent’s comment on this.)
Examples for very popular primes are the Nikon 50mm f/1.8D and the Canon 50mm f/1.8 II.
If you own such a lens, just don’t forget that you should not always shoot at f/1.8. ;)

Introducing Color Scopes: The Vectorscope

The last scope (after the Histogram and the Waveform and RGB Parade) that is new to kdenlive 0.7.8 is the Vectorscope. This is actually the most interesting scope because it is quite different from the other ones and, secondly, is really useful for Color Grading.

More in the full article »


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