[FFmpeg-devel] [patch] enable yuva420p as overlay background

[Stefano Sabatini]

On date Tuesday 2012-11-27 07:45:31 +0000, Tim Nicholson encoded:
> On 26/11/12 23:57, Stefano Sabatini wrote:
> > On date Sunday 2012-11-25 15:24:29 +0000, Mark Himsley encoded:
> >> Same calculation as for RGBA etc to create unpremultiplied output.
> > 
> >> Useful for creating an intermediate "ME bank", in vision mixer
> >> (switcher) terminology.
> > 
> > What do you mean by "ME bank"?
> > 
> 
> I thought that would cause confusion... In a vision mixer which can
> blend (mix overlay etc etc) two streams together, one of the streams may
> itself contain such a blend, so that the final result contains 3
> streams, blended in a cascaded manner.
> 
> The "upstream" blending is usually done in a vision mixer on what is
> referred to as an "ME bank" (Mix /Effects). Big units may well have
> several of these to enable multiple cascading.
> 
> A________  ME bank
>          \______________
> B________/              \   Main
>                          \________
> C________________________/
>

Thanks, applied.
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