Are you still taking screenshots? That is sooo last decade. Today if you want to showcase your application, your gaming skills, or even your astonishing new desktop wallpaper collection, you need a screen recorder (or screencasting tool) to capture full-motion video and audio of your desktop. You’ll find several solid options, but which one works best for you depends a lot on the type of content you need to capture, and what you intend to do with it.
For starters, the output produced by the tool varies considerably. Some alternatives give you a wide choice of video and audio codecs, others just one. But if that one (say, Flash) is the one you need, producing it directly is much quicker than having to save an intermediary file and crank it through a video editor. It also may be important to select just a portion of the screen rather than your whole display, or to choose a specific frame-rate (high for games, low for bandwidth-saving demos). Finally, there are always special features that vary between utilities, such as whether or not they can capture OpenGL content or be started remotely by script.
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