New parameters for SVT-AV1 encoder

Added new video codec parameters for the SVT-AV1 encoder:

Parameter	Description	Allowed Values
crf	Constant Rate Factor value (CRF mode)	Integer between 1 and 63
mbr	Maximum Bitrate for Capped CRF	Integer 1-100000 (kbps), supports b/k/m suffixes
mbr-overshoot-pct	Allowable datarate overshoot percentage for Capped CRF	Integer 0-100
gop-constraint-rc	Enable GoP constraint rate control	0 – off 1 – on
buf-sz	Client buffer size in ms (CBR only)	Integer 20-10000
buf-initial-sz	Client initial buffer size in ms (CBR only)	Integer 20-10000
buf-optimal-sz	Client optimal buffer size in ms (CBR only)	Integer 20-10000
minsection-pct	GOP min bitrate (percentage of target rate)	Integer 0-100
maxsection-pct	GOP max bitrate (percentage of target rate)	Integer 0-10000

Parameter	Description	Allowed Values
enable-qm	Enable quantisation matrices	0 – off 1 – on
qm-min	Min quant matrix flatness	Integer 0-15
qm-max	Max quant matrix flatness	Integer 0-15
chroma-qm-min	Min chroma quant matrix flatness	Integer 0-15
chroma-qm-max	Max chroma quant matrix flatness	Integer 0-15
lambda-scale-factors	Scale factors for lambda values per frame type (comma-separated)	Comma-separated integers (value/128 = actual scale)

Parameter	Description	Allowed Values
tf-strength	Temporal filtering strength	Integer 0-4
luminance-qp-bias	Adjusts frame QP based on average luma	Integer 0-100
sharpness	Bias towards decreased/increased sharpness	Integer -7 to 7

Parameter	Description	Allowed Values
lookahead	Number of frames to look ahead	Integer -1 to 120 (-1: auto)
hierarchical-levels	Hierarchical levels beyond base layer	2 – 3 temporal layers 3 – 4 temporal layers 4 – 5 temporal layers 5 – 6 temporal layers
pred-struct	Prediction structure	1 – low delay frames 2 – random access
rtc	Fast settings for RTC in low-delay mode	0 – off 1 – on

Parameter	Description	Allowed Values
enable-dlf	Deblocking loop filter control	0 – off 1 – on
enable-cdef	Enable Constrained Directional Enhancement Filter	0 – off 1 – on
enable-restoration	Enable loop restoration filter	0 – off 1 – on
enable-tpl-la	Temporal Dependency model control (CRF/CQP only)	0 – off 1 – on
enable-mfmv	Motion Field Motion Vector control	-1 – auto 0 – off 1 – on
enable-dg	Dynamic GoP control	0 – off 1 – on
fast-decode	Fast Decoder levels	0, 1, or 2
enable-overlays	Enable insertion of overlayer pictures	0 – off 1 – on

Parameter	Description	Allowed Values
tune	Tuning metric	0 – VQ 1 – PSNR 2 – SSIM
scm	Screen content detection level	0 – off 1 – on 2 – content adaptive
film-grain-denoise	Apply denoising when film grain is ON	0 – no denoising 1 – level set by film-grain parameter

Parameter	Description	Allowed Values
superres-mode	Super-resolution mode	0 – off 1, 2, 3 – on 4 – auto-select
superres-denom	Super-resolution denominator (mode 1 only)	Integer 8-16 (8: no scaling, 16: half-scaling)
superres-kf-denom	Super-resolution denominator for key frames (mode 1 only)	Integer 8-16
superres-qthres	Super-resolution q-threshold (mode 3 only)	Integer 0-63
superres-kf-qthres	Super-resolution q-threshold for key frames (mode 3 only)	Integer 0-63

Parameter	Description	Allowed Values
sframe-dist	S-Frame interval in frames	Integer >= 0 (0: off)
sframe-mode	S-Frame insertion mode	1 – only if altref frame 2 – next altref frame

Parameter	Description	Allowed Values
color-primaries	Color primaries	Integer 0-22
transfer-characteristics	Transfer characteristics	Integer 0-22
matrix-coefficients	Matrix coefficients	Integer 0-14
color-range	Color range	0 – Studio 1 – Full
chroma-sample-position	Chroma sample position	unknown, vertical, left, colocated, topleft

preset - Range extended from 0-8 to -1 to 13
rc - Changed from text values (cqp, vbr, cvbr) to numeric (0, 1, 2). Note: cvbr is no longer supported
qp - Range changed from -1 to 64 to 1-63
min-qp - Renamed from qmin, range changed to 1-63
max-qp - Renamed from qmax, range changed to 1-63
irefresh-type - Now supports Open GOP (1) and Closed GOP (2)
enable-tf - Range extended from 0-1 to 0-2
tbr - Now accepts b/k/m suffixes
scd - Renamed from sc_detection

Changelog