VideoComposeSettings.referenceResolution property

Optionally supply a fallback reference resolution. This allows description of the composition in a desired coordinate system, e.g. a resolution of 100x100 can be specified to allow the source and destination areas to be described in percentage terms, or a notional resolution can be used that is independant of the source resolutions that may be provided.

if set here, this reference resolution will be applied to any parts that do not have their own reference resolution specified

If not provided the source and destination rectangles are in terms of the source and output resolutions respectively.

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