[FFmpeg-devel] [PATCH 0/2] colorkey vf, int math conversion, libavfilter questions
Carl Eugen Hoyos
cehoyos at ag.or.at
Thu Apr 30 01:52:40 CEST 2015
Timo Rothenpieler <timo <at> rothenpieler.org> writes:
> The other issue is the pixel format conversions done
> by this filter. It seems like libavfilter expects a
> filter to be able to convert from any of its input
> formats to any of its output formats.
>From a user's perspective, I don't think this is
correct: The output format of a filter depends on its
input format (if several are supported) and possibly
on the used options.
> This isn't the case for this filter. The only
> "conversion" it does is from BGR0 to BGRA, 0RGB to
> ARGB, and so on, if the input format doesn't
> already contain an alpha channel.
This sounds reasonable to me (again, from a user's
perspective) and I think there must be other filters
that act similarly.
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