Video Art: Experimental Animation and Video Techniques in Linux
For most of us, the notion of animation brings to mind deliberate, structured sequences. In this section, I introduce some less-traditional ways of creating mind-blowing, computer-generated effects without having to know languages like Processing or Pure Data (both of these are very powerful, but not everyone who wants to animate knows how to code).
In my own work with video, screen recording tools have been indispensable. Sometimes I use them to capture animations I make in Pencil, because the movie export feature is broken in the version I use. Other times, I just want to capture some cool imagery on my screen without worrying about proprietary copyrights, so I take screen recordings of free software.
My preferred screen recorder is the bare-bones, command-line version of recordMyDesktop. Your distribution's repositories also might provide the graphical front ends GTK-recordmydesktop and QT-recordmydesktop, but I find those to be buggy and prone to crashes when recording long scenes. You can record your entire screen with:
The recording will start as soon as you enter the command, and it
will stop when you press Ctrl-c. Read the man page for more
options, such as recording a specific window (tip: find a window's ID with
If you aren't familiar with the trippiest screensaver in the world, go on-line and look up some images of Electric Sheep. The software artist Scott Draves created Electric Sheep as a dynamic, collaborative fractal flame animation that runs on and by thousands of computers worldwide. Networked data determines the mutations of the various "sheep" in the animation, and users can vote on and contribute their own sheep. And because it's all free, anyone can use the images generated in this android dream.
So how do you take a screen recording of a screensaver? Well, guess
what: Electric Sheep is a binary. Just enter
into your terminal and watch the magic in MPlayer.
If you want to create your own sheep, check out the program Qosmic.
Figure 5. Using recordMyDesktop to Capture Electric Sheep
XaoS is a real-time, interactive fractal zoomer that will capture the eye of mathematicians and VJs alike. You can change the fractal formulae and colors with many different parameters and filters. My favorite is the Pseudo-3D filter, which extrudes lines to generate what looks like a surreal landscape. Using the left and right mouse buttons, you can zoom in and out as if flying a plane over the "terrain".
Figure 6. XaoS with the Pseudo-3D Filter Applied
Fyre is a program that generates and animates Peter de Jong maps. You don't need a screen recorder to make animations with this; you can enter key frames and render an AVI file directly from the program. As you can see from the screenshot shown in Figure 7, Peter de Jong maps make for some neat, abstract images.
Figure 7. Animating in Fyre
Alphas and More to Look Out For
Unfortunately, there is not enough space in this article or in my brain to cover all the new video-related Linux software that's in development. In lieu of a complete list, I'll provide you with the names of a few projects that I expect to be worth checking out for both developers and end users.
Auteur is one cool new kid on the block. I first heard of this project in an episode of the podcast "The Bad Apples" (which has since been re-branded as "GNU World Order"), produced by Seth Kenlon, aka Klaatu, who is also a developer on the Auteur team. Klaatu noted the absence of a truly solid nonlinear video editor for Linux, so he set out to make one with all the features he felt existing software was lacking. The Web site currently says that the project is frozen due to lack of programmers—so programmers, why not help out with a promising alpha?
Figure 8. Testing Out Auteur
The folks behind the VLC media player have a nascent project called VLMC (VideoLAN Movie Creator). The latest releases are still basic and not quite stable, but knowing what the VideoLAN team is capable of, I am sure this will mature into a serious nonlinear video editor. They currently are looking for contributors.
Pencil is a traditional 2-D animation program, which, although still in beta, already fills a gaping hole in the sphere of Linux animation tools. It allows drawing in both vector and bitmap formats as well as importing images and sounds. My trials with Pencil have been basic but mostly satisfactory, although the video export feature appears broken in Linux. I have compensated for that and made some cool videos anyway simply by taking a screen recording during animation playback in Pencil. There is an active community of Pencil users who post animations on the Pencil Web site's gallery. Pencil is similar to Synfig Studio, but I find the interface easier to navigate.
Figure 9. An Animation I Made in Pencil
Puredyne is a multimedia Linux distribution based on Ubuntu and Debian Live, specifically designed for real-time audio-visual processing. Many of the tools and APIs I haven't had the verbal real estate to cover in this article (such as FreeJ, Gephex and DataDada) are included either in the distribution itself or in optional modules.
And, there you have it, animators and filmmakers. I hope this article inspires a cool music video or two!
ZS4 Video Compositing: http://zs4.org
t@b Software: http://www.thugsatbay.com/tab/?q=software
ZS4 Download: http://zs4.net/download
Psychological Image Collection at Stirling (PICS): http://pics.psych.stir.ac.uk
JPEG to MJPEG-AVI Converter: http://sourceforge.net/projects/jpegtoavi
Electric Sheep: http://www.electricsheep.org
Auteur Non-Linear Editor: http://auteur-editor.info
Pencil—Traditional Animation Software: http://www.pencil-animation.org
Rebecca "Ruji" Chapnik is a freelance creator of miscellanea, including but not limited to text and images. You can find her experiments at http://rujic.net
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.Register Now!
- SUSE LLC's SUSE Manager
- My +1 Sword of Productivity
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Managing Linux Using Puppet
- Non-Linux FOSS: Caffeine!
- Doing for User Space What We Did for Kernel Space
- SuperTuxKart 0.9.2 Released
- Google's SwiftShader Released
- Parsing an RSS News Feed with a Bash Script
- SourceClear Open
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide