Hello recently I wanted to record my game with tips for a friend and I had a problem with the fact that the quick time player plays the recorded sound but does not display the image,only a black screen.
Sounds like you would need to take that up with Camtasia's developers, or determine which part of the file you're adding isn't supported by the program (e.g. the MP4 or FLV container, the h264 video, or the AAC) so you can remux or re-encode it.
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