A screencast is a digital recording of computer screen output, also known as a video screen capture, often containing audio narration. The term screencast compares with the related term screenshot; whereas screenshot is a picture of a computer screen, a screencast is essentially a movie of the changes over time that a user sees on a computer screen, enhanced with audio narration.
Links
srcbin.blogspot.com/2009/09/record-your-desktop-with-ffmpeg.html
You can see a tutorial on how to use ffmeg to do screencast in linux here: https://www.youtube.com/watch?v=B-ry-f3Mpx4
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