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Further re VDMX, Ray has just reminded me that you can limit the render rate (soz if you already know this)
– VDMX5 > Preferences… > Rendering
– Scroll down to reveal the hidden Advanced Rendering Prefs button and hit it
– Uncheck Display Drives Canvas Rendering
– Alongside its dimensions, your Canvas/Main Output will now have a FPS setting – set that to whatever seems reasonable – probably the rate of your original video source
It’s not going to give you true sync, but coupled with only rendering in OF on new frames it should improve things quite a bit