Question / Help HDMI Multi source micro-ATX mix setup

[ShockiTV]

Hello,

I am trying to test/prepare some best practices to stream our local events with more automated solution in mini-ATX format.
So linux was my 1st choice. After looking into compatibility list of most used cards it was not looking very well tho.
After some research there seems to be just 1 candidate and that is Black Magic Decklink Recorder.
According to specs, it needs just PCI-Express 1, so there is plenty of motherboards with 3x PCI-E.
Can I pick like any of these, or should I focus on gamer boards with 3xPCI-E 16x already from bandwidth point of view ?
I am not sure what kind of load it would put on motherboard.

As an addition I want to run nginx-rtmp and stream remotelly few more sources to this PC and make final mix in OBS.
Is there any additional CPU overhead I need to count with, or just that single software x264 encoding will be the main factor?

Cause atm when encoding display capture on my i7-3770k even 720p@60fps medium x264 CPU preset is not consuming too much resources.

 

[dodgepong]

Pretty much all Blackmagic devices should work, though the Intesity Pro 4k might have some issues. Another option is the Magewell XI100USB-HDMI, if you have a USB 3.0 port.

As for which motherboard to choose, I would check what the requirements are for full speed video on the capture cards you're looking at and just make sure your motherboard would support them all at the same time.

As for the RTMP importing, x264 is the only load you'll really have to be worries about. Importing RTMP streams does not add noticeable load.