Problem with mp4 playing in Storyline course

Hello -

I have an mp4 video that was created in Camtasia that won't play when published in a Storyline course. I even used the Articulate video encoder to change to FLV just to see if maybe using an Articulate product would help this video to play in the course. 

I add the video to the course and I can see it in preview mode. But if I publish the course, it gets hung up on this video and won't finish publishing. It just says "Encoding Videotitle"  I have attached a screen shot for your reference. Do you have any tips to get this video to play in the published course? Thank you   

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