hwmap=derive_device=vaapi:mode=write:reverse=1 after scale_opencl fails
because scale_opencl creates a new OpenCL surface that has no association
with the original VAAPI surface. reverse=1 requires an existing mapping.
On Intel, VAAPI and QSV share the same libva surfaces, so mapping the
post-CRT OpenCL frame directly to QSV (mode=write:reverse=1) works the
same way it does in the doOclTonemap path.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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