Video fuzziness

I was hoping someone could help me.  I created a few "videos" using Microsoft PowerPoint (basically graphics with animations).  I then plugged these into Storyline, saved them and published.  No problems in general BUT...

When I play the videos they seem a little "fuzzy" or distorted.  The graphics are good quality and when not in a video those SAME graphics look fine in Storyline.  Is there something I can do or something I am doing wrong to make them not remain crisp?

THANK YOU

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