Working in Blackmagic Resolve
Posted by Marco Paolini on 30 August 2017 08:08 PM

DFT v1 supports Blackmagic Resolve via the OFX plug-in format. Working with secondary layers and alpha channels in Resolve requires a specific workflow.  Please consult the Resolve documentation for specifics.

Note: The Composite, Drop Shadow, Edge Composite, Light Wrap, and Matte Repair plug-ins currently do not work in Resolve as expected because of limitations in the Blackmagic Resolve implementation of alpha channels in the OFX API.

Secondary Layer Workflow

As of Resolve 11.1 it, an OFX plug-in can use secondary layers. For instance, you can hook up a foreground and a background input.

  1. In the Media tab’s file browser, right-click on the clip to be used as a secondary layer and select Add to Media Pool as a Matte.
  2. In the Color tab, apply the desired DFT filter to your primary media’s node.
  3. Right-click the node and select Add OFX Input.
  4. Right-click the node again, select Add Matte > Timeline Mattes, and select the name of the clip you previously imported as a matte.
  5. Click the dotted line connecting the blue triangles on each node and the press Delete.
  6. Select the Source Bar (gray rectangle with green square located on the left of the node window) and connect it to the RGB Input (top grey circle) of your primary node.
  7. Select the RGB Output (bottom grey circle) of the Ext. Matte node and connect it by dragging to the OFX input (middle grey circle) of your primary node. The node now uses the secondary layer.

Working with Alpha and Compositing

To composite one clip over another in the Timeline using plug-ins such as zMatte:

  1. In the Edit tab, place the background on Video 1 and the foreground above it on Video 2.
  2. Select the foreground clip on Video 2.
  3. In the Color tab, apply the desired DFT filter to your primary media’s node.
  4. Right-click on the node and select Use OFX Alpha.
  5. Right-click an empty area of the Node Editor and choose Alpha Output to reveal the Node Tree output on the right that lets you assign a key to be used to define clip transparency.
  6. Connect the node’s triangular key output to the Alpha output at the right of the node editor.
  7. Once the matte parameters are adjusted in zMatte, the foreground will be composited over the background based on the generated matte.
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