Hello and thank you for your question!
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Please see this link for instructions on how to use video backgrounds with OpenLP:
https://docs.google.com/document/d/1X3JOEEVYHBqK1emhgZ7dLcyX-5xOk8cYt9-xD1OfXsQ/edit?usp=sharing<br style="box-sizing: border-box;">
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We are working to make this easier but it's a difficult task and will take us some time to do.
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If you want to help with the programming, you should start by having a look at our wiki pages.
http://wiki.openlp.org/Main_<wbr>Page#Development
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All the best & hope this helps,
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Azaziah