.mpg or .flv imported video won't play

Hi guys, we're attempting to post a video into our Lectora course that is originally in .mpg format that has been exported from WinFast, a PC video capture card that rips live television. It won't play in either .mpg format or .flv format, just a black box with a control panel. We can use the new upload from YouTube feature successfully with no problems.

Apologies if this sounds naive, but can anyone help??

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