Under Configure OpenLP/ Players, if I have VLC listed first I get a file unsupported error when I try to play a video. I've tried multiple formats, but typically the files are .mp4. If I have System listed first it will play the video but pixelates and lags. I can play the videos fine outside of OpenLP. I'd love to be able to use OpenLP for the videos though. Any thoughts on what the issue may be?