Question about Apple TV lag when mirroring to two displays...

Question,

I am a pastor whose church uses Proclaim weekly. Recently our church decided to helped put on a small youth camp whose facilities had a widescreen projector permanently mounted to the ceiling with a single vga hookup in the very back of the room. To help my worship team with the lyrics, I decided to mirror the presentation via an Apple TV (on airplay) to a 42" flatscreen up front.

So my setup was macbook pro in the rear with a thunderbolt to vga adapter running the projector for the main display with an apple tv hooked up to a flatscreen via airplay for the worship leader. Both the projector and apple tv were on external display and were mirroring the same window. My problem wasn't that it didn't work. It did. But the apple tv had a tendency to lag considerably behind the vga projector at times. For instance, when I changed a lyric slide, the projector that was hardwired always changed seamlessly, while the apple tv monitor would be inconsistent. Sometimes it would lag or freeze between slides while, at other times, it worked perfectly.

My questions are: (1) Is it graphics card related and I need to forget trying it again!? (2) Is it Yosemite? (some online forums seem to say apple tv lags in Yosemite) (3) Or is it Proclaim struggling to do something it wasn't created to do?

Macbook Pro 15"(mid-2014), 2.5 Ghz i7, 16 gb ram, NVIDIA GeForce GT 750M 2048 MB

Apple TV 3rd gen

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Comments

Josh Edwards

I don't think it's any of those. I have found that if using an Apple TV its best to have it hooked to a router with a cable and not wirelessly. You can then use it as a wireless display but throughput it limited when it's connected to the network wirelessly. One other suggestion: have you tried it wirelessly using the Apple TV as a stage display instead of mirroring the output showing all the backgrounds and videos?

Scott Alexander

I have heard there are issues with AirPlay on Yosemite when Bluetooth is enabled on the laptop. Have you tried disabling Bluetooth?

David Philip Speas

thanks for the reply. i'll try out the router to apple tv via internet first. as for the second suggestion...i didn't even know you could set an output as stage display instead of mirroring...how do you do that!?

David Philip Speas

thanks for the tip scott. i actually already tried that. thanks though.

Josh Edwards

David, here's how I set it up. On the AirPlay icon on the top right of your Mac, connect to the AppleTV then make sure to extend desktop (so it's using the AppleTV as a separate display).

Then open Proclaim and under "Settings" make sure you choose "Confidence" for the AppleTV display (Use "identify monitors" if you need to see which is which). Also, make sure your Mac (should be display 1) is set to "No Signal (Application)" and the Projector is set to "Slides". That should do it!