[FFmpeg-devel] [PATCH 1/2] libavdevice/decklink: Add support for EIA-708 output over SDI

Devin Heitmueller dheitmueller at ltnglobal.com
Tue Nov 28 22:16:59 EET 2017

Hello Marton,

> SDK says:
> When capturing ancillary data with a 4K DeckLink device, the ancillary
> data will always be in the 10-bit YUV pixel format.
> This also applies to 8 bit YUV captures according to my experience.

Thanks for refreshing my memory.  I remember reading that text, but for some reason thought it was RGB formats, not 4K capture products.

That’s actually a really nice feature - if you’re not feeding a 10-bit encoder then it would avoid having to do 10-to-8bit colorspace conversion in software in order for VANC to be properly preserved.  In earlier products you either had to choose between 8-bit video but VANC wouldn’t be properly preserved, or you could do 10-bit video but then have to colorspace convert from V210 to an 8-bit format.

In the future I’ll have to look and see if that’s exposed through a decklink attribute (or do we have to hard-code the model info into the application to know which cards work this way).



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