This is a great question, and while I don't think you can just students' understanding one way or another simply with test results, I think the question still has to be asked: do videos support new learning, or simply reinforce incorrect learning. Derek Muller discusses his doctoral thesis: "It is a common view that 'if only someone could break this down and explain it clearly enough, more students would understand.'... they do not engage with the media on a deep enough level to realize that what was is presented differs from their prior knowledge." The answer isn't a simple yes-no, of course: if misconceptions are presented and then refuted (a la Mythbusters) then students can learn from videos.
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