AMF HEVC encoding on Windows is locked to Level 5.1 — cannot set Level 6.2 or High Tier via FFmpeg options

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

32.1.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/DjrlcgkYocbp6DDK

OBS Studio Crash Log URL

No response

Expected Behavior

Expected behavior
I would like to be able to freely configure the profile, tier, and level during encoding — for both SDR and HDR content.

AMF Manual
AMF_Video_Encode_HEVC_API.pdf

Current Behavior

When recording with AMF HEVC encoding on Windows, the output is always fixed at Level 5.1. Even when passing the following FFmpeg options manually, neither Level 6.2 nor the High Tier takes.

Steps to Reproduce

params:
AMF_VIDEO_ENCODER_HEVC_PROFILE_MAIN
AMF_VIDEO_ENCODER_HEVC_TIER_HIGH
AMF_VIDEO_ENCODER_HEVC_PROFILE_LEVEL_62

Please refer to the log for details.

Anything else we should know?

To the best of my recollection, this issue has persisted since around OBS 31 and has not been resolved across subsequent versions.

Start by reviewing the linked OBS log and the AMF Video Encode HEVC API documentation. Trace how AMF_VIDEO_ENCODER_HEVC_PROFILE_MAIN, AMF_VIDEO_ENCODER_HEVC_TIER_HIGH, and AMF_VIDEO_ENCODER_HEVC_PROFILE_LEVEL_62 are handled for Windows encoding. Done means the requested profile, tier, and level can be configured for SDR and HDR output instead of remaining at Level 5.1.