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decklinkvideosink: Always configure 10 bit YUV for VANC frames

Sebastian Dröge requested to merge slomo/gst-plugins-bad:decklink-10bit-vanc into master

If 8 bit are required by the device/mode then it will be converted internally by the SDK, but the SDK won't automatically convert from 8 to 10 bit. As such, always use 10 bit VANC.

Some devices require configuring also a 10 bit video format when using 10 bit VANC is required but those would fail regardless and the application would have to configure the correct video format.

With newer versions of the SDK this information can be retrieved via the BMDDeckLinkVANCRequires10BitYUVVideoFrames flag but we don't use a new enough SDK version yet to extract this information.

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