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choose the appropriate option that corresponds to the application you’re exchanging projects with (or DaVinci Resolve if you’re working entirely within DaVinci Resolve), then DaVinci Resolve conforms and processes all clips in the Timeline to play at whichever frame rate is selected in the “Timeline frame rate” drop-down menu. For example, 23.98, 29.97, 30, 50, 59.94, and 60 fps clips will all play at 24 fps if that’s what “Timeline frame rate” is set to in the Master Settings panel of the Project Settings.
How clips in mixed frame rate timelines are rendered out depends on whether the Render Settings are set to render Individual source clips or a Single clip.
— Individual source clips: All clips are rendered individually at their original frame rate.
— Single clip: All clips are converted to the “Timecode calculated at” frame rate and rendered as a single media file. Clips are converted using whatever method is selected in the Retime process drop-down of the Master Settings panel of the Project Settings, or in the individual Retime process setting found in the Video inspector of each clip that overrides the project-wide setting. You can choose Optical Flow processing for the highest quality conversion that’s available in DaVinci Resolve.
Export Alpha Channels in Individual Clips Mode
This option only appears if you’re rendering to a media format that supports alpha channels. If your media contains an Alpha channel, you have the option to turn on the Export Alpha checkbox in the Video panel of the render settings whenever you render individual source clips. When you do so, DaVinci Resolve renders clips with alpha channels in either of two cases:
— Whenever there is an Alpha channel embedded in the source media for that clip, the embedded Alpha channel will be copied to the rendered version of that clip.
— Whenever a clip’s grade has a key connected to an Alpha output, the Alpha output will be rendered as an alpha channel for that clip.
In either case, you may only render Alpha channels out when you render individual source clips to an RGBA format such as TIFF, OpenEXR, ProRes 4444, ProRes 4444 XQ, or DNxHR 444.
Export Alpha Channels in Single Clip Mode
DaVinci Resolve allows rendering Alpha channels in Single Clip mode if the selected codec supports an Alpha channel (i.e., ProRes 4444, DNxHR 444, etc.). This lets you apply a single Alpha channel to an entire timeline for export, rather than just at the individual clip level.
1 Select “Single Clip” mode in the Render Settings.
2 Select a codec that supports an Alpha channel in the Video tab’s Codec and Type selection boxes.
3 Select the checkbox “Export Alpha” that appears under the Frame rate selector.
4 If supported by the codec, you can chose the Alpha Mode type. Premultiplied is the default.
If the codec you have selected does not support an Alpha channel, the “Export Alpha” box will not appear as an option.