This change is needed to support 2K DCI video modes.
Version 10.8 of the Decklink SDK supported DCI video modes for output
only. This updated version drops that restriction.
The current latest version of the Decklink SDK is 11.5, however
the gstreamer decklink plugin is not compatible with API changes
introduced in version 11 of the SDK. Therefore I have opted to upgrade
to the latest 10.x version instead.