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AMF Options
i = int (whole number), b = boolean (true/false)
Usage=transcoding, ultralowlatency, lowlatency, webcam
Default: Transcoding
Explanation: Changes a lot of settings based on usage. Highly recommend sticking to "transcoding".
Quality=speed, balanced, quality
Default: Quality
Note: Can fall back to faster presets if throughput is too high vs max throughput.
Profile=main, high, constrained_baseline, constrained_high
Default: High
Explanation: h264 profile. "High" should work for all modern devices (think iphone 4 and later).
ProfileLevel=i
Default: 42 (4.2)
Explanation: H264 profile level. Specifies constraints for decode.
MaxNumRefFrames=i
Default: 4
Explanation: 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.
RateControlPreanalysisEnable=i
Default: True
Explanation: Pre-encode assisted rate control.
EnforceHRD=b
Default: True
Explanation: Enforce Hypothetical Reference Decoder. Constraints on QP variation within a picture to meet HRD requirements.
FillerDataEnable=b
Default: False (True if CBR)
Explanation: Filler data. Useful for strict CBR encoding, like live streaming.
VBVBufferSize=i
Note: in bits (bps)
InitialVBVBufferFullness=i
Note: 0=0%, 64=100%
PeakBitrate=i
Note: in bits (bps)
MinQP=i
Default: 18
MaxQP=i
Default: 46
B-Frames and its features currently require RDNA2 (RX 6000 and higher). Seems to currently cause some issues, try 1 or 2.
MaxConsecutiveBPictures=i
Default: 0
Explanation: Max consecutive b-frames.
BPicturesPattern=i
Default: 0
Explanation: Sets the number of consecutive b-frames. 0=off.
AdaptiveMiniGOP=b
Default: False
Explanation: Variable amount of b-frames.
Note: Might require Pre-Analysis.
BReferenceEnable=b
Explanation: Enable/Disable the use of b-frames as reference frames.
DeBlockingFilter=b
Default: True
Explanation: Enable/Disable the de-blocking filter.
EnableVBAQ=b
Default: True
Explanation: Adaptive quantization. Prioritize bits to parts of the image humans care about.
HighMotionQualityBoostEnable=b
Default: False
HalfPixel=b
Default: true
QuarterPixel=b
Default: true
EnablePreAnalysis=b
Default: False
Explanation: Pseudo 2-pass for a certain number of frames. Enabling will disable VBAQ. GPU load hit (spends traditional 3d/render resources)
PASceneChangeDetectionEnable=b
Default: True
Explanation: Akin to scenecut (adaptive I-frame insertion). Safest to disable for HLS transcode platforms, as is potentially risky for muxer segment/split.
PAFrameSadEnable=b
Default: True
Explanation: Frame SAD (Sum of Absolute Difference) algorithm
PALookAheadBufferDepth=i
Default: 0
Explanation: Pre-Analysis lookahead buffer size