Except of using screenshot (using an image), sometimes needed to capture desktop screen using video to show the way of to do something or take some demo or and illustration. there's a good news for Gnome Shell (Gnome 3) user, because they don't need to install any additional application to record their desktop activity using video.
There is build in desktop video recording tool/screen recording tool inside of Gnome shell, you can easily capture desktop activity by pressing shortcut ctrl+shift+alt+r , after pressing ctrl+shift+alt+r you will see such notification in the bottom right corner of your desktop, when you see the notification, Gnome will start record your desktop, see following screenshot.
|Ubuntu Desktop Screen Recording Tool (see the red mark in the bottom right corner)|
Following video is produce by Gnome Shell screen recording tools:
- Video Format : webm (playable in VLC and Mplayer).
- Resolution : 1366 x 768
- Framerate : 15 Frames per sec
- 1 Minute = 3MB
- Codec vp8 Video
This is one of great feature which is owned by the Gnome Shell, but one notable thing you should know is, you can't record any voice using this, you will get silent video, to add any voice and sound you need video editor software like audacity and Openshot.