Not many know of this, but as of KDE 4.2, Kwin, the window manager has a nifty little feature – it can grab videos of desktop much like a screencasting tool such as Camtasia. This functionality requires Kwin’s composition mode to be enabled (ie, you must be using Kwin’s desktop effects).
Below video shows where and how you can enable the video recording feature. Note this video was recorded using KWin.
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