<p>I have a Blackmagic Design DeckLink card which, with bundled software, provides live keying.  I bought that card before they sold a DeckLink 4K cards.  But because they come withe the same bundled software and make the same live-keying claims, I would check that this version first: <a href="https://www.blackmagicdesign.com/products/decklink/techspecs/W-DLK-04" rel="nofollow">https://www.blackmagicdesign.com/products/decklink/techspecs/W-DLK-04</a></p>

<p>You should be able to ingest two channels of 4K video, key it, and output the keyed result in real-time, for $995.  It does require you to have free PCIe card slots in your computer.</p>

<p>An entry level 4K switcher (that gives not only pre-rendered alpha matted footage, but also transitions and chroma key) runs $1,695, and runs stand-alone (i.e., not a card in your computer): <a href="https://www.blackmagicdesign.com/products/atem/techspecs/W-APS-04" rel="nofollow">https://www.blackmagicdesign.com/products/atem/techspecs/W-APS-04</a></p>

CC BY-SA 3.0
2015-10-07T22:01:27.290Z
2015-10-07T22:01:27.290Z
Michael Tiemann
<p>I'm looking to take a 4K live video feed, and composite alpha channeled footage on top of the live footage, all in realtime with minimal latency, I then want to display the output on a 4K screen .... Any ideas of the technology and equipment nesasarry to make this happen </p>

CC BY-SA 3.0
2015-10-09T04:23:28.663Z
Have you looked in to the software wirecast pro?
screaming drills
<4k><compositing>
How to composite live 4K video with prerendered alpha matted footage
user379468
# How to composite live 4K video with prerendered alpha matted footage

(Asked by: username_0 on 2015-10-07)

I'm looking to take a 4K live video feed, and composite alpha channeled footage on top of the live footage, all in realtime with minimal latency, I then want to display the output on a 4K screen .... Any ideas of the technology and equipment nesasarry to make this happen

**Tags:** 4k, compositing

> **Comments:**
> **username_1**: Have you looked in to the software wirecast pro?  

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## 1 answers

### Answer by username_2 on 2015-10-07. Score: 1

I have a Blackmagic Design DeckLink card which, with bundled software, provides live keying. I bought that card before they sold a DeckLink 4K cards. But because they come withe the same bundled software and make the same live-keying claims, I would check that this version first: <https://www.blackmagicdesign.com/products/decklink/techspecs/W-DLK-04>

You should be able to ingest two channels of 4K video, key it, and output the keyed result in real-time, for $995. It does require you to have free PCIe card slots in your computer.

An entry level 4K switcher (that gives not only pre-rendered alpha matted footage, but also transitions and chroma key) runs $1,695, and runs stand-alone (i.e., not a card in your computer): <https://www.blackmagicdesign.com/products/atem/techspecs/W-APS-04>


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