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If wireless video control is absolutely necessary, it's worth noting that bluetooth has proved more reliable than wifi. The As of 2017, the "Unified Remote" app provides a nice free interface for for controlling a computer from a phone. It runs much more reliably on Android than iOS.
During the Show
There are lots of things that can go wrong with video. Make sure you're there before every show to set things up - make sure everything is plugged in, turned on, and if possible run through the cues with the person in charge of that.