Direct integration of AMD AMF encoder

[Xaymar]

Discussion Thread

#860

Provide a summary of the Improvement

The AMD AMF encoders should be available via StreamFX directly, instead of relying on FFmpeg.

Completion Requirements

• A reasonable amount of documentation should be present in the code.
• Support for Windows and Linux with the available Graphics APIs in libOBS.
• Zero-Copy and Multi-GPU encoding should be supported with the best matching API (if possible on the API).
• Both H.264/AVC and H.265/HEVC should be available for encoding.
• The User Interface should expose all useful UI options in a similar way to the (via FFmpeg) encoders. This includes the Custom Settings field, which allows users to specify settings that override everything shown in the UI.
• All common encoding formats between libOBS and AMF should be supported (NV12) in the bitness available at implementation time.
• Performance should be similar to the already existing (via FFmpeg) AMF encoder, if not better. Memory usage is secondary and can be worse if necessary.

[jarrard]

Yeah I lost the AMD AMF H.265/HEVC option recently (it never worked when it did appear) which is unfortunate because apparently it can now work... Total bummer!