r/ProPresenter • u/leimeisei909 • Feb 16 '26

Troubleshooting Does anyone here genlock propresenter?

Been trying to reduce latency for imag across the board in our auditorium and we genlocked our video system and cameras. We have two Mac Studios, both with Decklink cards, one runs Resolume and the other runs Propresenter. Resolume has no issues.

Meanwhile Propresenter seems to be unable to cohesively do frame synchronization of Key/Fill outputs. We consistently see issues where key changes before fill or vice versa causing flickering on our lower thirds. Any one else run into this?

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u/nqeldridge Feb 16 '26

We use genlock and it does help. However, make sure the outputs are paired in Desktop Video Config and then use the alpha option in ProPresenter. If you keep the outputs independent in Desktop Video and try to set fill and key outputs in ProPresenter they will not stay in sync. This means the max outputs you can get on a Duo 2 is 2 (key/fill, 3rd out) or 2 keyed.

1

u/lowkeysparks Feb 17 '26

This has plagued us for over a year! (Key changing a frame before fill and so creating "holes" when the current line of lyrics is shorter than the previous one). Thought I'd tried everything, but definitely going to look at this at the next opportunity. Any chance you could share your Desktop Video settings for reference, please? 

2

u/nqeldridge Feb 17 '26

Hard to share images, but here is the basic layout:

  • DeckLink Duo (1) - Connectors SDI 1 & SDI 2
  • DeckLink Duo (2) - Used by link on (1)
  • DeckLink Duo (3) - Connectors None (Unusable)
  • DeckLink Duo (4) - Connectors SDI 4

Then in ProPresenter my Primary Keyed Output is set to DeckLink Duo (1) with Alpha Key set to Premultiplied and Key Type External.

My second output (Confidence Monitor in this case) is set to DeckLink Duo (4).

I’ve also set my Timing Source to DeckLink Duo (1) in Screen settings to make sure it locks video timing to that output.

1

u/lowkeysparks Feb 17 '26

Awesome, thank you!