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Most devices from AJA and Blackmagic with at least 2 SDI outputs allow to play out Fill & Key, which is useful in situations where the final mixdown should be done using a production mixer. Please contact AJA or Blackmagic directly to find out if your video device does support this function with the output format of your channel.

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1. Open the AJA ControlPanel.
2. Select the SDI Out tab.
3. Select Video+Key for SDI Output 1 and SDI Output 2. This option is only selectable when your device supports Fill & Key.
   

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Blackmagic Devices

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1. Open just:connect.
2. Open the Advanced Output Format settings of the desired Channel.
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3. At the top there is the Live SDI Input Configuration.
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4. Select With DSK, default pass-through.
   
   
   
5. This will allow the just:out engine to send transparency information to the video device.

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