new pc to connect 4 projectors

alice

Thank you all for your comments!

I want four different contents in my four external displays, so i want individual control.

So I guess I will go with a desktop.. I just didn't understand the recomendation. Do you think it's better to use the blackmagic deckLink Duo (PCI express) https://www.blackmagicdesign.com/products/decklink/techspecs/W-DLK-31

(so i would have four video outputs)

or the aja 4K Mini Converter https://cvp.com/product/aja_ha5-4k_mini_converter?fbclid=IwAR0XHWWnW5gbkww3IDpBtdYPcN7ybFidql_jgf2XvReNnABbUsXF9vUAp8k (where i would have one 4K display splitted in four?)

Is Isadora compatible only with Matrox TripleHead2Go? The Matrox QuadHead2Go is too expensive for me..

alice

@mark_m that's alright! this is interesting stuff!

mark_m

@alice

If you got a little computer like mine, you wouldn't need any external hardware: you could run your 4 x 720p projectors plus a monitor from it. It'd cost you around $US 1300 plus monitor, keyboard and mouse, and a couple of adapters to attach your projectors to the MiniDP and / or Thunderbolt outputs. It'd give you four different contents on the four external displays.

alice

@mark_m

I'll do my research and I will come back! On a first glance I saw that the newer models support only 3 displays, so that model is the only one. I am a bit concered because I need it to be fast for the interactive things and it is two years old.. Thank you very much for the recomendation I will come back with more questions!

Woland

@alice said:

Do you think it's better to use the blackmagic deckLink Duo (PCI express) https://www.blackmagicdesign.c... i would have four video outputs)or the aja 4K Mini Converter https://cvp.com/product/aja_ha... (where i would have one 4K display splitted in four?)

Is Isadora compatible only with Matrox TripleHead2Go?

I'd have to leave that recommendation up to someone who has used the equipment. I make a point of not recommending equipment that I've not personally worked with or been given a good recommendation on by someone I know. I have and use two Matrox TripleHead2Gos, which is why I mentioned them. Specifically, the Matrox TripleHead2Go DP Edition is what you want if you're going for a TH2G.

alice

@woland

yes of course I wouldn't want you to recommend something you haven't used. I just need 4 projectors that's my problem.. I will check out these mini pcs and in the meanwhile if anyone have used this equipment just let me know!

Thank you all for your help!

jandraka

@alice

Hi,

These last few weeks I am testing the new Raspberry Pi 4. I have been surprised by the versatility and cost. Especially for two projects: Pi Presents, and the possibility of OSC control, and Dicaffeine Player, an NDI encoder / decoder in ARM platform. This last project is interesting since it allows you to send a stream from Isadora to the Raspberry, and connect it to a projector, with a UTP cable. Or take a single cable to the stage and distribute it to several Raspberrys with different sources. I have tested the player at 720p60 and it works correctly. It is a project that is still in beta but developing.
Maybe I still wouldn't use it for production but I think that over time it can be an alternative.

Best.

Fred

@alice I would avoid the blackmagic outputs , they are not connected to a GPU but require the signal from the GPU to be downloaded to the CPU and then output to the blackmagic card, there is little advantage in doing this. If the blackmagic or AJA gear was an option in your budget I would push it to a datapathx4. This is a great way to work with 4 outputs. You can maybe get 4 outputs from your GPU, and in the case of @mark_m 's computer I would guess that not all of these outputs could be used for displays at once, the GPU is integrated (albeit an AMD integrated into an intel CPU??). The datapath will take a UHD signal and output 4 independent 1920*1080 signals, it can be plugged into anything that supports 4k over HDMI so it is a great piece of gear to have. You can then be a bit more flexible about what machine you want to run stuff from, I am a big fan of rack/tower pcs, more value for money but yes a pain to carry around. A tower computer with the right GPU can also get you these outputs, watch out for mixing an integrated GPU output with those on the GPU, this can be problematic if your media and outputs are not distributed correctly (IE needing data to move between the GPU and integrated graphics).

I have been looking at these small form factor PCs lately https://comino.com/en/otto#overview-header they are not super cheap but water-cooled and come in a config with a 2080ti and an Intel® Core™ i9-10900KF processor, 10 Cores / 20 Threads with Max Turbo Frequency 5.30 GHz. They run cool and stable and are quite small, they will be safely transported in a pelican case with pluck out foam.

The ALIENWARE M15 R3 also has quite a variety of configurations where the power of the machine varies greatly and of course the cooling in a laptop (and this will directly control the machines actual performance and ability to run the components at the advertised speeds for any length of time) is significantly worse than a well designed tower.

Laptops have very limited options for upgrades, small form factor machines less so, and tower machines are very flexible.

Woland

@alice said:

I just need 4 projectors that's my problem

A laptop (built-in user interface display) capable of connecting to two external displays + Matrox TripleHead2Go = five displays

Built-In Display (laptop screen for the user interface): No connection needed
External Display #1: Connected to the first output port
External Displays #2, #3, and #4 (from one Matrox TH2G DP Edition): Connected to the second output port

A Mini PC or desktop machine capable of connecting to three external displays + Matrox TripleHead2Go = five displays

External Display #1 (external monitor for the user interface): Connected to the first output port
External Display #2: Connected to the second output port
External Displays #3, #4, and #5 (from one Matrox TH2G DP Edition): Connected to the third output port

If you have the budget, as @Fred said, the Datapath Fx4 is an even better option than the Matrox.

mark_m

@fred said:

I would push it to a datapathx4

Just to say that if you're in the UK or Europe @alice there's a chap on eBay selling 'em for GBP 210 which is an absolute bargain:
https://www.ebay.co.uk/itm/Dat...

alice

wow thank you all so much, you really helped!

Kathmandale

@mark_m

Good spot, they're a great deal. Counting my pennies...

Worth noting though @alice that those are the 'old' Datapath X4. They're a great piece of kit but only have the band width to support DVI-dual-link, 2560*1600@60. That said, you can get 4k through them but you have to reduce the refresh rate and it can be a bit fiddly to get it set up.

The 'new' datapaths are called FX4 and come in a few options, including SDI and Display port.

I'd certainly go down the datapath route if you've got the budget. They're so configurable you can scale images and define pixel precise input regions, so your 'capture' regions don't have to be halves/thirds/quarters but any area you chose. This means they can overlap for example, or have a gap. It means your set-up can be really flexible. In my experience they are also absolutely rock solid; you can leave them doing a job for years and they just get on with it, or move them every week and they take whatever you throw at them.

The matrox stuff is also really good in my experience but it's not quite on the same level in terms of functionality and reliability; which is fair enough really, because they're also a lot cheaper. And I'm not saying they don't work, they just often seem to forget what they're supposed to be doing when you turn on and need to re-configure them.

CitizenJoe

I must be missing something.

If I were building a machine, I would simply install a GPU with 5 outputs. Wouldn't that be simplist?

If I were using an existing machine, I would use a Matrox TH2G or DH2G, as needed, to get the number of outputs I want. I also really like the look of the new QuadHead2Go! @DusX, you've been testing this, haven't you? Unlike @Kathmandale, I've not had trouble with these units forgetting their config's in Windows. I find them very reliable.

I've not used the DataPath units as they're so expensive. Matrox is also a Canadian company, so easily available here in Canada!

Cheers,

Hugh

alice

yes you are right, it was the old one.. The new one is a bit expensive! I think if I will need this kind of equipment I will give aja a try

alice

@citizenjoe

yes, of course it will be simpler if I build a machine to have 5 outputs.. I don't know what I can find because I want to build a small pc. So I am just considering all my options so that I can find a balance between cost, reliability, and mobility - I don't have a big budget..

Woland

It will never hurt to have a Datapath Fx4 or Matrox TripleHead2Go in your kit. They're incredibly helpful pieces of equipment and I've used them for numerous projects. They're an excellent investment.

Kathmandale

@citizenjoe sorry, I didn't mean to give a bad impression of the matrox kit. I've got a TH2G in my personal kit and I use it all the time. And yes, the times I've had trouble with the set up tend to be on mac rather than windows. I don't have an X4 but I've used them on a lot of show's with hired kit or when I've been working with companies who do have them. They're kind of different beasts I guess. If was looking for this kind of kit and I could get a second hand X4 for the same price as a new TH2G (as @mark_m linked to above) then I'd probably get the X4.

I don't have any real evidence of this from hard testing, it's more of a feeling, but I tend to prefer using something external to having many outputs from the onboard GPU. My small form PC (Gigabyte one in my signature) has 4 outputs, I used it on a show that had three projectors and one local 'control' screen. Everything seemed to run better and have less problems with a single show output going through the TH2G than when I tried to do the same thing using a separate output for each projector. I don't know if there's an improvement in performance when the computer is processing the same number of pixels, but it always feels to me as though the more physical displays that are attached the harder the computer has to work.

I don't often spec computers for a single show, possibly because I don't do much installation work where you leave a machine on the show for a long stretch. My approach tends to be to try and get something that will do the next 5 years of shows (at least) and that can be really flexible. The number of outputs isn't as much of a concern as the overall performance and flexibility when it can easily be increased by off-board kit such as a TH2G/X4.

Many ways to skin a cat though and I know other people will have different approaches and priorities.

Fred

@citizenjoe @alice

As far as i know there is not a great selection of GPUs that support 5 monitors directly. Nvidia GTX and RTX series support 4 per card.

@CitizenJoe started a great thread here https://community.troikatronix.com/topic/6786/integrated-graphics-for-work-monitor that I added some questions to to clear up using multiple GPU's, especially things like an on board GPU in an intel CPU that would get you 5 outputs (1 for the isadora interface and 4 for the projections). The limit of 4 outputs is why I suggested a datapathx4 to get the 4 outputs, it was my understanding that using multiple GPU's is not a good way to go and uses a lot of extra resources (some testing some time ago and some assumptions that may be wrong led to this). At any rate watch the other thread for hopefully some clearer answers to the multi-gpu question as it would influence the advice we would all give to the original question here.

DusX

as Fred has said most nVidia cards support 4 outputs total. AMD tend to support 6.

The Matrox QuadHead2Go is a great alternative to the Datapath. I have been using it and rather like the unit. The software and configure is nicer than with the tripleheads.

mark_m

@mark_m

I just wanted to put this here for future reference re my NUC (in signature).

It will support 5 x displays at 60Hz and 6 x displays at 30hz.
Here's the complete breakdown:

https://www.intel.com/content/...

I just ordered a few various Thunderbolt 3 to HDMI and Displayport cables and adaptors to see how well they work and what'd be the best combination for me (I like a UHD monitor, but none of my projectors have higher resolution than 1080p)