Answers.Body: <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>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-10-07T22:01:27.290Z
Answers.LastActivityDate: 2015-10-07T22:01:27.290Z
Answers.UserDisplayName: Michael Tiemann
Body: <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>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-10-09T04:23:28.663Z
Comments.Text: Have you looked in to the software wirecast pro?
Comments.UserDisplayName: screaming drills
Tags: <4k><compositing>
Title: How to composite live 4K video with prerendered alpha matted footage
UserDisplayName: user379468
ThreadText: # 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?  
  
  ---
  
  ## 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>
  
  
  ---
  
  