DeckLinkOutputSettings.displayModeId property

Typically left undefined: the output display mode is derived from the incoming frames' resolution and frame rate, preferring progressive (so e.g. 1080p25 content is emitted as 1080p25, not 1080i50). Set a specific DeckLinkDisplayModeId only for the rare case where a particular SDI timing is required that auto-selection wouldn’t pick.

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