Best way to power a video wall?

chadu's picture

I'm constructing a large video wall with irregularly placed, non grid oriented displays.

In your experience what method of displaying has worked best for you?

Using multihead cards, potentially using 4 cards in a Mac pro, then connecting that mac pro to network of 4-5 other mac pros?

Using networked mac minis, each one powering a display or using imacs, each one as a dispaly?

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Furthermore, is QC visualizer up to the task of splitting across 2 dozen screens or would it be best to use the Network Broadcaster/Receivers on each client?

Should I be investigating using OPen Frameworks or something else as the playback engine instead of QC?

Thanks for any pointers on those doing this kind of stuff already. I'm just starting to dabble. Having a lot of fun so far, too!

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dust's picture
Re: Best way to power a video wall?

i would say a combination of both multi-head and machines. they both have there advantages. i think a combination of triple heads would be ideal.

chadu's picture
Re: Best way to power a video wall?

Thanks for the input. I have some dual proc quad core mac pros... also have a few imacs using the i7 proc and the top graphics card in em at this point.

the budget gods were kind this month.

want to use em to their fullest.

is there a place to look for cards that are the best with QC?

franz's picture
Re: Best way to power a video wall?

performance-wise (and to avoid problems, synch etc...), an array of identical hardware should perform better than different models.

jrs's picture
Re: Best way to power a video wall?

I've used both methods in 2 different museum exhibits (and tried QC for both but ended up going native for both due to performance). From that experience I'd say it really depends on what you want to do.

Use a single machine with multiple cards or some matrox box's (we were using both) if you:

  • Are spreading video across two screens that are next to each other, even if your not edge blending you will notice them being out of sync

  • Have synced audio and visuals (and are using a single sound system) - enough people struggle with syncing audio and video on the one machine let alone across a network

Use multiple machines if

  • you have high performance demands - whilst its easier to run multiple screens off one machine it comes at a cost

  • have long cable runs - we couldn't mount the mac pro next to the projectors and had a long cable run which caused issues - we bought some expensive signal amps which helped but things could still be more reliable