Perfect codec for fluent video editing on Linux is called DNxHD

I came across DNxHD just a short while ago, searching for a solution to be able to fluent edit my videos from various occasions. So far it was a bit of a problem since the video editing software had trouble to decode it fast enough (we speak about 1920×1080 AVC video), and so it was a pain to just cut them into pieces. But with DNxHD its piece a cake, the only downside is the fact it need a lot of space (8 min equals ~11 gb when the video is 1920×1080) but the positive aspect is that its visually lossless. Before I used H264 lossless mode, but yea, same problems as with the AVC files from the cam itself, through a bit better since its not in M2TS format anymore. I really wish they would finally add VDAPU (nvidia) and its AMD counterpart to the known video editors. Anyway, to convert a source m2ts to our DNxHD mov (yes, Quicktime, otherwise it won’t work) just do the following on a console after navigating into your video folder:

avconv -i 20120526130908.m2ts -vcodec dnxhd -b 185M -s 1920x1080 -aspect 16:9 -deinterlace -r 25 -acodec pcm_s16be -v verbose -y

Here I convert the live performance of Shiroku that I captured on the  Dokomi this year into DNxHD for editing. The file also needs deinterlacing and decimate since its taken in 50i. If you capture in 60i (NTSC) you want to change the “-r 25” to “-r 30”. Also you can change here already the resolution if you plan to use a lower res later or your camera actually takes a lower res. To do so change the “-s HxW” parameter, for example for 720p go for “-s 1280×720”. When you change the picture size you also can change the video bit rate. I found a useful table at this page. Currently ffmpeg just support 8 bit DNxHD, and through that our video editing software also only support 8 bit since practically all software on Linux use ffmpeg for de/en-coding in the end. If you system don’t have “avconv” just replace it with “ffmpeg”. I migrate from the ffmpeg to the avconv command since with ffmpeg-0.8 the “ffmpeg” command is marked as legacy. Also I found it quite useful to export from my video editing software to DNxHD, and encode the material with Handbrake. The DNxHD export works way faster than the usual H264 export, and Handbrake tends to encode the H264 more efficient then the video editing software does. If you still look for software to edit with, here is a list of software I use(d):

And if you have suggestions for more video editing software, just post a comment. I’m always open to try something new.

ColorHug – A open source display colorimeter

Picture of the ColorHug attached to a screenToday I read in the current issue of the Linux Magazin about a opensource colorimeter named ColorHug. It’s certainly something nice since first of all its opensource and also its noticeable cheaper then professional ones. Another plus point for me is that it works on Linux. Many probably wonder “What the heck is a colorimeter to begin with and why does it bother me?”. Well it’s not too complicated, a colorimeter is a device allowing you to calibrate your monitor so it shows the colors accurate. And why should you care? Since you want to view your pictures/videos even nearer to reality, and also it helps when you edit them. The ICC profile that gets generated by it can be used with Linux (well, to be expected, eh?), Windows and also Mac OSX.

The ColorHug itself is a small accessory with the dimensions 32mm wide, 43mmm tall and 21mm deep. It gets connected via USB. Here are some pictures from ColorHug’s website to illustrate how it looks.

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The ColorHug is a lot faster then similar products and the good point is it’s open design, which allows for example picture or video editing software to integrate it.

Currently you can preorder the ColorHug for just £48 (56,57€ / 74,92$), its a 20% developer discount since the ColorHug probably have some bugs in the beginning. But due its open design and the possibility to upgrade firmware it no problem to fix possible problems later. If you order later the price is supposed to be £60 (70,70€ / 93,65$), so I suggest if you’re intrested, preorder now.

Please be aware that there are no OSX/Windows driver, users not using Linux can use the LiveCD or the Software included in Fedora 16 or later. For ordering and even more information please visit the ColorHug website.

The software and the firmware for ColorHug can be found on

St. Martin Day festivities in Uerdingen

This clip was done by Marcus and me when we’re attended the traditional St. Martin’s Day festivities. It shows the kids marching with their self-made lanterns and later the fire. Sadly they didn’t showed the cutting of the cloth this year, but still it was nice. For more background on this festivity checkout Wikipedia.

OpenRheinRuhr: Gründen mit freier Software – Tipps & Tricks für Gründer und IT-Dienstleister

ORR2011: Gründen mit freier Software – Tipps & Tricks für Gründer und IT-Dienstleister

Gründer haben es schwer. Man muss an viele Dinge denken, sich organisieren, sich finanzieren, auf dünner Decke tragende Säulen errichten, mit wenig Geld auskommen und sein Geschäft zum Blühen bringen. Freie Software ist hier in vielerlei Hinsicht ein wichtiger Baustein. Einerseits für den nicht-IT-Unternehmer, weil er professionelle Werkzeuge nutzen kann, ohne Tausende zu investieren und nur wirklichen Nutzen bezahlt. Und natürlich für den IT-Unternehmer, weil er seinen Kunden diese Werkzeuge näher bringen kann und nicht an Lizenzen sondern am Nutzen und der Dienstleistung verdient, die seine Kunden abnehmen. In meinem Vortrag mit Live-Präsentation werde ich Ihnen zeigen, wie sich Gründer und IT-Unternehmer mit freier Software besser organisieren können. Dazu werden Sie Sie an praktischen Beispielen sehen, wir man mit dem kombinierten Einsatz freier Werkzeuge leistungsfähiger und zukunftssicher wird.

– was hindert Gründer (und bestehende Unternehmen) am Geld verdienen?
– was braucht man als Gründer überhaupt?
– wie gründet man mit IT (als IT-Gründer und als Gründer an sich)?
– die Organisation – lieber einmal richtig als dauerndes Flickwerk
– das Wachstum – Hilfe! Mein Laden läuft…
– freie Software – kein Allheilmittel aber ein wichtiger Baustein zum Erfolg
– Beispiele aus der Praxis, live und in Farbe
– Fragen und Diskussion

(entnommen von

Hier finden sich die zum Vortag gehörigen Folien:

Und natürlich die weiterführenden Links:
– das KaMUX Partnernetzwerk:
– das freie KMUX-Projekt:


Kapuzinerberg (autumn)

Kapuzinerberg (autumn)

A set of footage I did shot with my new camcorder as test material to get a feeling. Also its to fill a request by a friend who wanted to see more of the area around the Kapuzinerberg here in Krefeld, Germany.

In this area I took the video footage.