To export a video with a transparent background from DaVinci Resolve, you need to use a codec that supports an alpha channel and enable the export alpha channel option. Here's how:
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Go to the Deliver Page: Navigate to the "Deliver" page in DaVinci Resolve.
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Choose DNxHR or ProRes Codec: Select either DNxHR or ProRes as your codec because these codecs support alpha channels.
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Enable Export Alpha Channel: In the video settings, find and enable the "Export Alpha Channel" option. This tells DaVinci Resolve to include the transparency information in the exported file.
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Render the Video: Add your file to the render queue and begin rendering. The resulting video file will now have a transparent background where applicable.
In Summary: Use the DNxHR or ProRes codec and enable "Export Alpha Channel" in the Deliver page settings.