Video Art: Experimental Animation and Video Techniques in Linux
The famous GNU Image Manipulation Program can create animations as well as still images. Because it is a full-featured image editing program, you can use it to create an animation entirely from scratch.
In order to import a prepared image sequence into GIMP, click File→Open as Layers... or press Ctrl-Alt-o. The Open Image dialog allows you to select multiple files, which then will appear as layers.
Figure 3. An animation in progress that I made by tracing reference photos of faces from the Psychological Image Collection at Stirling (PICS).
In the example shown in Figure 3, I imported a series of reference photos into GIMP and traced over them in cyan and then in black. I eventually deleted the reference photos and blue layers, leaving only the black-lined drawings that I planned to use for my final animation.
To finish my animation, I exported the layers as a GIF and specified animation parameters in the export dialog. Because I wanted to use the animation in a video, I had to turn the animated GIF into a video file. I ultimately chose to do this by way of screen recording, but that is not the only option.
From Stills to Movies
Let's say you have a sequence of images, or perhaps an animated GIF, that you want to make into a video file. There are several ways to go about this.
Stopmotion started as a student project under the Skolelinux/Debian-edu organization in 2005. Although it hasn't been updated since 2008, I find it to be a handy tool for anyone working with frame-by-frame animation. You might have trouble finding Stopmotion in your distribution's repositories if you aren't using a DEB- or RPM-based package manager, but you can, of course, compile it from source on any distribution; that's how I set it up in Sabayon Linux.
Stopmotion is simple and to the point, with a nice drag-and-drop interface. It's not designed for heavy post-production or for drawing and adding effects to frames. Rather, the point is to give users an easy way to arrange images sequentially and export them into a video file.
The video import and export options are limited only by your imagination (and your knowledge of the command line). If you know how to use FFmpeg and/or MEncoder to convert image sequences to video, you can pass your desired command-line arguments to Stopmotion, which is essentially a GUI for those programs. Stopmotion also gives you several choices of video capture commands for grabbing video from your Webcam or another attached device.
One cool feature I didn't know about until I read the user's handbook was the option to add sound. You can set a sound clip to start at any given frame by double-clicking on it. The audio I added to my sequence didn't play in the exported AVI, but maybe you'll have better luck.
If you want to perform more-advanced editing on your individual frames, Stopmotion has a button to open a selected frame in GIMP. You also can export your data into Cinelerra for video editing.
Figure 4. Animating a Sequence of Faces in Stopmotion
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.
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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