Files
FFmpeg/libavfilter
Zhao Zhili ba9c635784 avfilter/vf_chromakey_cuda: specify alpha_mode of output
Fix assert failure with:

ffmpeg -init_hw_device cuda=gpu -filter_hw_device gpu \
	-i input.mp4 -an \
	-vf hwupload,format=cuda,chromakey_cuda=color=black,hwdownload,format=yuva420p,alphaextract \
	-f null -

Assertion frame->alpha_mode == link->alpha_mode failed at src/libavfilter/avfilter.c:1085
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