Files
ffmpeg/libavfilter
Niklas Haas 899e497122 avfilter/vf_libplacebo: force premultiplied blending for linear texture
Blending onto independent alpha framebuffers is not possible under the
constraints of the supported blend operators. While we could handle
blending premul-onto-premul, this would break if the base layer is YUV,
since premultiplied alpha does not survive the (nonlinear) YUV conversion.

Fortunately, blending independent-onto-premul is just as easy, and works in
all cases. So just force this mode when using a linear intermediate blend
texture, which is always RGBA.
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