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Alternative to fx4

Posted: Fri Mar 08, 2019 11:58
by willtom
I'm looking at splitting a uhd hdmi output into four hd outputs on 3g sdi. An fx4-sdi is roughly £2200+vat, a fx4/h & 4x hdmi>sdi totals about £1700+vat, and a hdmi>12g sdi converter into a 12g>quadlink 3g split totals about £800+vat.

Are there any clear disadvantages to doing it the cheap way? Or in this particular set of circumstances are these all basically identical solutions?

(I know I'll lose the flexibility of non broadcast resolutions, and the 12g solution won't be expandable up to 7680x2160@30, but I can live with those two limitations)

Re: Alternative to fx4

Posted: Fri Mar 08, 2019 12:16
by He2neg
if you just want to spilt a 4k hdmi Signal into 4 SDI 1080 outputs you can use

https://www.aja.com/products/mini-converters/ha5-4k

Re: Alternative to fx4

Posted: Fri Mar 08, 2019 12:24
by willtom
He2neg wrote:
Fri Mar 08, 2019 12:16
if you just want to spilt a 4k hdmi Signal into 4 SDI 1080 outputs you can use

https://www.aja.com/products/mini-converters/ha5-4k

Wonderful, thank you

Re: Alternative to fx4

Posted: Tue Mar 12, 2019 04:05
by lightbx
Last thing to note is that the Fx4 keeps all frames in sync, and the AJA HA5-4K can be offset by about 1 frame, or ~50ms. Another user ran a test and provided these numbers here, I believe in a thread specifically about the HA5-4K.

If they are all separate screens, and especially if they are all playing different content, the AJA will do what you need just fine (and at a third of the price). If you plant to edge blend 4 1080p signals together, or array 4 screens into a single image somehow, you'll want to keep your frames in sync.

Re: Alternative to fx4

Posted: Wed Mar 13, 2019 13:59
by willtom
There is a chance of this being use for edge blending. I'm surprised to hear that quadlink sdi isn't kept in sync, do you have a link for the previous discussion?