Posts

Following my previous post, I attached a video camera to the composite input of my tv tuner. One good thing I didn’t noticed yesterday is that mplayer can be told to directly use pvr:// as a source instead of the generic tv:// (with many options). So you just have to enter mplayer pvr:// -tv device=/dev/video1:input=0 in order to watch tv. Noticed the input=0 above? This tells the tuner to take the video signal from the tv (read the mplayer man page to see how to change the channel). Now, since I connected my video camera to the composite video in, I need to tell mplayer to use it with input=1. One last thing: taking a screenshot in mplayer is done by pressing the ’s’ key (with option -vf screenshot. In summary, the image below was taken with mplayer pvr:// -tv device=/dev/video1:input=1:noaudio -vo x11 -vf screenshot (camera facing the screen). ...

I recently got a Hauppauge WinTV-PVR-USB2 (a TV tuner, video recorder and FM receiver) because I read it was well supported on GNU/Linux. The following post explains how I installed it on a Fedora Core 9. If you want to install it with another Linux distribution, some information may vary but most of the following steps will be exactly the same. First connect the USB device, the list of USB devices shows my system has recognised it: ...

Diwali, the Indian Festival of Lights, is under way in India. But if you live in Belgium, there will be at least three occasions to celebrate! In Antwerpen, first, on October 29th, morning. Then in Leuven, on November 1st evening, organised by the association of Indian students in Leuven. Finally in Ghent, on November 3rd evening, organised by the Indo-Belgian Association of Ghent. Edit on November 1st: Bharatiya Samaj is also organising Diwali in Bruxelles on November 8th. ...

If you live in Belgium, you probably noticed a small bu zz about a database police is building about Belgian citizens and, more precisely, about the access control of this database. The “problem” is that this database already exists and it has a legal basis since … 1998 (10 years!). But mainstream media won’t tell you that (or I’m unaware of it). I don’t think there is a conspiracy. It’s just that, sadly, the current economic environment doesn’t leave much space for this kind of information. The Minister of Justice’s website has more info on this database and its content (excerpt of translation below): ...

Finally, I got a working pixel lapse software under Linux :-) It’s a bit late (and I have to work tomorrow), code is rather dirty but I’ll publish it as soon as possible (btw that’s why I needed a webcam and a library to read it yesterday). Originally, “pixel lapse” photography is the process of creating an image one pixel at a time. Beginning in the upper left corner, pixels are captured sequentially at a set rate until the entire image is formed. ...

A small post just to keep this command at hand: mplayer -fps 30 -tv driver=v4l:width=640:height=480:device=/dev/video1 tv:// This allows you to watch what your webcam “sees” (provided it uses a video4linux webcam). Btw, Cheese is funny to use too! I was also trying to find a decent Python library for video4linux but I only found outdated ones ( libfg, 2003, and pyv4l, 2002). I guess I’ll have to use some C library for a small project I’ll tell you about later ;-)

In my previous post, I was glad to see that the Journal of Visualized Experiments ( JoVE) was now indexed by PubMed. I then spent some time watching some very interesting videos. And I realized that something is missing … In my mind, I thought that third-party archiving (like arXiv or self-archiving) was one of the mandatory requirements for Open Access journals … and I was wrong. It seems JoVE is not giving the (technical) possibility to download the publication from their website (all what you can download is the abstract in text version). Now that this publication is a video and not a text/PDF version, it’s a problem for me (who cares?) and the Open Access movement (imho). ...

JoVE, the Journal of Visualized Experiments is a peer reviewed, open access, online journal devoted to the publication of biological research in a video format. Think of a YouTube-like service for the life-science community, add a quality control before publication and you’ll get the picture. As many other Open Access scientific journal, JoVE is now indexed in PubMed, the life-science publications directory. It’s nice to see interesting, open and innovative initiatives getting a “recognition” like this. ...

Following my previous post about an e-conference, Daneel Ariantho provided me with interesting informations … The conference about scientific patents was part of Second Nature, (scientific journal) Nature’s home in the virtual world of Second Life. Following their description, Second Nature is home to scientific exhibitions, ongoing projects and regular events. The conference in itself was given in November 2007 but, unfortunately, nor slides nor podcast are available. In real life, if you miss a conference, you still have a copy of the slides or, at least, the abstract ;-) . ...

While looking for pictures related to patents, I found these interesting ones taken by Daneel Ariantho on Flickr. They depict a virtual conference about scientific patents. It could be interesting to get more information about 1) the content of this conference and 2) the kind of conferences organized in these virtual worlds. It could also be interesting to see the social aspects of these conferences (are your contact better/different in a virtual conference?) and the “quality control” (of speakers, of posters, of advertizers, …).