Recording a video that is playing on your computer can be tricky, especially if you want the sound from the video to be recorded. Suppose you have a video you have made and want to play the video and also talk over it, to provide more information or context. By default you can’t do this. Below are a couple of quick and relatively painless solutions to help you do this.
1) Camtasia http://www.techsmith.com/camtasia.html
Camtasia for both mac and PC has educational pricing, see website for specifics. Generally, this program is quite easy to use and allows you to:
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2) Quicktime Pro + Soundflower (MAC only)
Quicktime Pro is available for approx. $35 from quicktime.com. Among many of its features it allows for you to make audio, video and screen recordings. However, if you want record the audio of a movie playing on the computer instead of recording your voice for example, you will need to also download Soundflower.