ProPresenter 6 Tutorial: How to add video countdowns
У вашего броузера проблема в совместимости с HTML5
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http://TrinityDigitalMedia.com If you want to add an actual countdown video, instead of using the built in countdown utility in ProPresenter, it's not that hard. Try using the props layer, instead of putting the video in the slides layer. By doing so, you'll have the ability to change slides underneath (with a preservice loop, for example).