[FFmpeg-devel] [PATCH] avfilter/vf_chromakey: The chromakey filter preserves non-opaque alpha transparency.

[Timo Rothenpieler]

On 11.06.2020 22:27, Gavin Smith wrote:
> This is to address trac ticket #8724.  The filter did not preserve alpha transparency. Items that were transparent in the input would appear black on the output or pixels that were semi-tranparent would appear opaque.
> 

What is the performance impact for inputs without an alpha channel?

Generally looks fine to me, but might need hidden behind an option, as 
to not break existing setups that rely on this filter 
discarding/ignoring the input alpha channel.