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ffmpeg/libavfilter
Kacper Michajłow 00e49750e8 avfilter/vf_scale_vulkan: convert to the negotiated chroma location
The output link accepts any location and the frames are converted to the
negotiated one. Format conversions tagged the output as top-left while the
chroma of each 2x2 block came from whichever of its four invocations
stored it last, and scaling without a format change scaled each plane on
its own grid, which only keeps center sited chroma in place. The chroma of
each block is now sampled once at its location, and the chroma planes are
resampled from the input location to the output one. Without a negotiated
location, subsampled input keeps its location and other input still gets
top-left, and input without a location is assumed to be sited like the
output.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
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