Can you share ffmpeg command where you use libplacebo over opengl?
No, there is no such command because that is not how libplacebo is meant
to work. Libplacebo uses the hardware abstractions that are available,
it is not possible to specify which backend to use. It takes the best
one available for the job depending on the hardware capabilities.
Ultimately resorting to the dummy (cpu/software encoding) backend if
there is no gpu capable of doing the job with OpenGL, Vulkan or DirectX.
Again from the libplacebo documentation:
"Every attempt was made to provide these features at a *high level of
abstraction*, taking away all the messy details of GPU programming,
color spaces, obscure subsampling modes, image metadata manipulation,
and so on."
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