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avfilter/vf_palette(gen|use): support palettes with alpha

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Soft Works 2021-10-13 18:33:05 +02:00 • committed by Paul B Mahol
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doc/filters.texi
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@ -16580,6 +16580,9 @@ Compute new histogram for each frame.
@end table
Default value is @var{full}.
@item use_alpha
Create a palette of colors with alpha components.
Setting this, will automatically disable 'reserve_transparent'.
@end table
The filter also exports the frame metadata @code{lavfi.color_quant_ratio}
@ -16658,6 +16661,11 @@ will be treated as completely opaque, and values below this threshold will be
treated as completely transparent.
The option must be an integer value in the range [0,255]. Default is @var{128}.
@item use_alpha
Apply the palette by taking alpha values into account. Only useful with
palettes that are containing multiple colors with alpha components.
Setting this will automatically disable 'alpha_treshold'.
@end table
@subsection Examples