Without engine_type, frc_amf uses the runtime's default DX12 engine even
on a DX11 AMF context. The interpolated frames then come back as DX12
surfaces, and the filter runs about three times slower. Select
FRC_ENGINE_DX11 on a DX11 context whose device has feature level 11_1 or
higher, and keep an explicit engine_type. The DX11 engine fails Init()
on 11_0, which is what hwcontext_d3d11va creates, so those devices keep
the default.
Assisted-by: Claude Opus 5.5
Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de>
Julius Bairaktaris
1fe6854fd9