[FFmpeg-devel] [PATCH]lavd/decklink_dec: Do not claim to output transparency information

[Maksym Veremeyenko]

29.09.2017 23:54, Marton Balint пише:
[...]
> For output, there is definitely hardware support. For capture - I am not 
> sure. I have not heard of a decklink device capturing key/fill.
> 
> Unfortunately the decklink SDK uses the same constants for both capture 
> and output, and if we want to follow the SDK, we can't drop alpha 
> channel, because for both RGBA and ARGB modes it explicitly mentions 
> that the alpha channel might be valid. It does not differentiate between 
> input and output however.
> 
> Maybe somebody should ask BlackMagic.

https://www.blackmagicdesign.com/media/release/20150413-16
[...]
.... get simultaneous fill and key capture and playback ...

-- 
Maksym Veremeyenko