AMF Options

i = int (whole number), b = boolean (true/false)

Parameters and options are written as such:

Usage=transcoding Quality=speed

General

Parameter	Options	Default	Explanation
Usage	transcoding, ultralowlatency, lowlatency, webcam	Transcoding	Changes a lot of settings based on usage. Highly recommend sticking to "transcoding".
Quality	speed, balanced, quality	Quality	Controls the speed vs quality. Note: Can fall back to faster presets if throughput is too high vs max throughput.
Profile	main, high, constrained_baseline, constrained_high	High	h264 profile. "High" should work for all modern devices (think iphone 4 and later).
ProfileLevel	i (10-62)	42 (4.2)	H264 profile level. Specifies constraints for decode.
MaxNumRefFrames	i	4	Limits the max number of reference frames (0-16). This max is also limited by hardware and h264 levels. More ref frames means more encoder work, but potentially better compression. Stick to 4 or less, for the sake of compatibility and profile conformity. The encoder is currently likely to use a single reference frame unless b-frames are active.

Rate Control

Parameter	Options	Default	Explanation
RateControlPreanalysisEnable	enum (0 or 1)	1 (enabled)	Pre-encode assisted rate control.
EnforceHRD	b	True	Enforce Hypothetical Reference Decoder. Constraints on QP variation within a picture to meet HRD requirements.
FillerDataEnable	b	False (True if CBR)	Filler data. Useful for strict CBR encoding, like live streaming.
VBVBufferSize	i	N/A	Note: in bits (bps)
InitialVBVBufferFullness	i	64 (100%)	Note: 0=0%, 64=100%
PeakBitrate	i	N/A	Note: in bits (bps)
MinQP	i	0
MaxQP	i	51

B-Frames

B-Frames and its features currently require RDNA2 (RX 6000 and higher). Seems to currently cause some issues, try 1 or 2.

Parameter	Options	Default	Explanation
MaxConsecutiveBPictures	i	3 (if supported)	Max consecutive b-frames
BPicturesPattern	i	0	Sets the number of consecutive b-frames. 0=off.
AdaptiveMiniGOP	b	False	Variable amount of b-frames. Note: Might require Pre-Analysis.
BReferenceEnable	b	True	Enable/Disable the use of b-frames as reference frames.

Psy

Parameter	Options	Default	Explanation
DeBlockingFilter	b	True	Enable/Disable the de-blocking filter.
EnableVBAQ	b	True (Unless CQP)	Adaptive quantization. Prioritize bits to parts of the image humans care about.
HighMotionQualityBoostEnable	b	False

Motion Estimation

Parameter	Options	Default	Explanation
HalfPixel	b	True
QuarterPixel	b	True

Pre-Analysis

Parameter	Options	Default	Explanation
EnablePreAnalysis	b	False	Pseudo 2-pass for a certain number of frames. Enabling will disable VBAQ. GPU load hit (spends traditional 3d/render resources)
PASceneChangeDetectionEnable	b	True	Akin to scenecut (adaptive I-frame insertion). Safest to disable for HLS transcode platforms, as is potentially risky for muxer segment/split.
PAFrameSadEnable	b	True	Frame SAD (Sum of Absolute Difference) algorithm
PALookAheadBufferDepth	i	0	Pre-Analysis lookahead buffer size
PAPerceptualAQMode	Enum 0/1	0 (None, off)	PA Perceptual adaptive quantization mode.
PATemporalAQMode	Enum 0-2	0 (None, off)	PA Temporal adaptive quantization mode. 1 for non-gaming applications, 2 gaming applications.
PAHighMotionQualityBoostMode	Enum 0/1	0 (None, off)	PA High motion quality boost mode
PACAQStrength	Enum (0-2)	1 (medium)	0=low, 1=med, 2=high. Content Adaptive Quantization (CAQ) strength