[Cin] OpenCL again

[Andrew Randrianasulu]

So, I run veeery experimental clvk (OpenCL via Vulkan) on my termux, ffmpeg
tried to init filter but died. I guess my day is not today ...


Anyway, my test line was:

ffmpeg -init_hw_device opencl=gpu -filter_hw_device gpu -i
~/20210419_055507A.mp4 -vf "hwupload, boxblur_opencl,
hwdownload,format=yuv420p" -f null /dev/null


for different filters format might be yuv420p or nv12 ...


I wonder if anyone here have working OpenCL ffmpeg setup ?

I'll try with llvmpipe/rusticl on desktop .... but it guaranteed to be slow.
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