Often you might want to take a snap of a video. This could be a movie, a home video, maybe a music video. You might want to use it on Wikipedia, set it as a desktop background, and what not? You can use VLC Media Player's inbuilt feature to do that.
On Windows, Linux or Unix, if you press Ctrl+Alt+S, VLC takes a snap of whatever is playing on the screen, not the whole screen. On a Mac, you replace Ctrl with the Command key.
On Windows, it's saved in the Pictures folder. On Windows XP and older, it is of course, My Documents/My Pictures. The photo on a Mac is saved on the desktop, and on Linux and Unix, it goes to home\vlc.
You can change the directory where the photo is saved via the Preferences -> Video, and you can modify the keyboard shortcut too, using Preferences -> Interface -> Hotkeys settings (after checking Advanced settings).
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