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Here is my situation. I'm doing a series of lectures for a Udemy course and I need to show people how to boot into tails from a USB drive. Obviously while configuring the bios and when in the new O.S it is impossible to run a software screencast solution thus I need some form of hardware to frame grab.

I've never done this before and I need some help to understand the basic concepts and what I should buy. I understand this question isn't quite in a stackexchange format thus at the very least if you could point me to a forum that could answer this question or a tutorial you think would be helpful, then I'd be very grateful

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You can use a graphics card that has a HDMI output connector.

Instead of connecting it to a monitor/TV you can connect it to a camera or a VCR that has HDMI input. This way you should be able to record anything that is shown at the card.

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@CharlesHoskinson it seems as this will do the work (but I don't know this product so check with the supplier/manufacturer to be safe). It also uses H264 which is perfect for YouTube etc. although it doesn't state what compression rate etc. it uses. –  Ken Jun 9 '13 at 21:15
    
So the ideal setup would be to get some DVI to hdmi converters and run the feed coming from the computer to the monitor through the device. –  Charles Hoskinson Jun 9 '13 at 21:37
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