vuality

Video Quality Assessment Utility for Node.js

This package is a kind of wrapper of FFmpeg to compare quality between two videos.

Currently vuality provides two Video Quality Assessment methods to compare quality - PSNR and SSIM.

Prerequisites

vuality uses ffmpeg internally. Please install ffmpeg, or download pre-built ffmpeg before using vuality package.

Usage

Install vuality to get up and running.

$ npm install vuality

Then:

import { Vuality } from "vuality";
 
const vuality = new Vuality();
// or
const vuality = new Vuality("/path/to/ffmpeg");
 
 
// Then either:
const psnr = await vuality.psnr("input.mp4", "reference.mp4");   
// or:
const ssim = await vuality.ssim("input.mp4", "reference.mp4");

API

vuality.psnr(input: Buffer | string, reference: string, options: AssessmentOption): Promise<PSNRStat>

Returns PSNR Stats

If scale option is provided, Vuality tries to scale video streams as given resolution before computing PSNR.

export interface PSNRStat {
  avg?: number;
  y?: number;
  u?: number;
  v?: number;
  r?: number;
  g?: number;
  b?: number;
  a?: number;
}
 
export interface PSNRFrame {
  n: number;
  mse: PSNRStat;
  psnr: PSNRStat;
}
 
export interface PSNR {
  psnr: PSNRStat;
  mse: PSNRStat;
  frames: PSNRFrame[];
}

vuality.psnrSync(input: Buffer | string, reference: string, options: AssessmentOption): PSNRStat

Sync version of vuality.psnr.

vuality.ssim(input: Buffer | string, reference: string, options: AssessmentOption): Promise<SSIMStat>

Returns SSIM Stats

If scale option is provided, Vuality tries to scale video streams as given resolution before computing SSIM.

export interface SSIMStat {
  all?: number;
  y?: number;
  u?: number;
  v?: number;
  r?: number;
  g?: number;
  b?: number;
}
 
export interface SSIMFrame {
  n: number;
  ssim: SSIMStat;
}
 
export interface SSIM {
  ssim: SSIMStat;
  frames: SSIMFrame[];
}

vuality.ssimSync(input: Buffer | string, reference: string, options: AssessmentOption): SSIMStat

Sync version of vuality.ssim.

Changelog

See CHANGELOG.

Testing

$ npm run test

Building

$ npm run build

License

MIT

See full license on mooyoul.mit-license.org