VMAF

Revision as of 13:38, 17 May 2022

Description

VMAF is a perceptual video quality assessment algorithm developed by Netflix. Refer to the FAQ page for frequently asked questions of VMAF.

This is a port of the VapourSynth plugin VMAF.

vmaf is used.

Requirements

• [x86] AviSynth+ or AviSynth 2.6
• [x64] AviSynth+
• Supported color formats: Y8, YV12, YV16, YV24, YV411
  • AviSynth+: all planar Y and YUV formats (8/10bit) are supported.

Syntax and Parameters

VMAF (clip reference, clip distorted, string log_path, int "log_format", int[] "model", int[] "feature", string "cambi_opt")

VMAF2 (clip reference, clip "distorted", int[] "feature", string "cambi_opt")

reference   =

distorted   =

Clips to calculate VMAF score. Must be in YUV 8..16-bit planar format.

distorted must be specified when feature != 5. (VMAF2 only)

Must be in YUV 8/10-bit planar format with minimum three planes.

string  log_path =

Sets the path of the log file.

This parameter is for VMAF() only.

int  log_format = 0

Sets the format of the log file.

• 0 : xml.
• 1 : json.
• 2 : csv.

This parameter is for VMAF() only.

int[]  model =

Sets which model to use. Refer to this, this and this page for more details.

• 0 : vmaf_v0.6.1
• 1 : vmaf_v0.6.1neg (NEG mode)
• 2 : vmaf_b_v0.6.3 (Confidence Interval)
• 3 : vmaf_4k_v0.6.1

This parameter is for VMAF() only.

int[]  feature =

• 0 : PSNR
• 1 : PSNR-HVS
• 2 : SSIM
• 3 : MS-SSIM
• 4 : CIEDE2000
• 5 : CAMBI

string  cambi_opt =

• enc_width, enc_height

Encoding/processing resolution to compute the banding score, useful in cases where scaling was applied to the input prior to the computation of metrics.

enc_width must be between 320 and 7680.

enc_height must be between 200 and 4320.

Default: Same as input image.

• window_size

Window size to compute CAMBI.

Must be between 15 and 127.

Default: 63 (corresponds to ~1 degree at 4K resolution and 1.5H).

• topk

Ratio of pixels for the spatial pooling computation.

Must be between 0.0001 and 1.0.

Default: 0.6.

• tvi_threshold

Visibilty threshold for luminance ΔL < tvi_threshold*L_mean for BT.1886.

Must be between 0.0001 and 1.0.

Default: 0.019.

Format: option_name=value.

If more than one option is specified, the options must be separated by space.

Usage example: cambi_opt="windows_size=120 enc_width=1280 enc_height=720".

VMAF2() exports frame property with the name of the used feature.

Examples

Comparing a high quality clip vs an encoded clip:

VMAF(HQ_original, HQ_encoded, model=0)

Comparing a high quality clip vs an encoded clip with MS-SSIM metrics only:

VMAF(HQ_original, HQ_encoded, feature=3)

Frame property cambi is set:

VMAF2(clip, feature=5)

Changelog

Version      Date            Changes

v2.1.1       2022/04/18      - Added `cambi_opt` options - `max_log_contrast`, `enc_bitdepth`, `eotf`
                             - Added function `VMAF2`
                             - Clips must have either 8-bit or 10-bit bit depth

v2.1.0       2021/11/14      - Added parameter cambi_opt
                             - Removed model default value

v2.0.2       2021/10/20      - Fixed feature parameter
                             - Updated vmaf lib to 2.3.0
                             - Added feature CAMBI

v2.0.1       2021/10/02      - Fixed crashing when unsupported color formats are used
                             - Updated libvmaf to 2.2.1

v2.0.0       2021/07/10      - Updated to libvmaf 2.x

v1.0.0       2020/11/14      - Initial release
                             - AviSynth+: self-registers as MT_SERIALIZED

External Links

• GitHub - Source code repository.

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