# Netflix VMAF and libvmaf

- id: src_01M569EDBTHBJFP26K3KXNDM9Q
- type: source · status: active · revision: 2
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T12 · tags: level:advanced, quality-metric, vmaf, psnr, ssim, encode-evaluation, cambi, code:c, code:python
- updated: 2026-10-18T01:24:28.594Z
- url: https://veyrul.com/sources/src_01M569EDBTHBJFP26K3KXNDM9Q

Source: https://github.com/netflix/vmaf

```json
{
  "archived": false,
  "checked_at": "2026-10-17T00:00:00.000Z",
  "parent_url": null,
  "usefulness": "Perceptual full-reference video quality metric plus C library; also bundles PSNR, SSIM, MS-SSIM, CIEDE2000 and CAMBI banding detection. Standard tool for choosing bitrates and validating encodes; integrates with FFmpeg.",
  "source_type": "repository",
  "availability": "available",
  "dependencies": [],
  "source_owner": "Netflix",
  "next_check_at": "2026-10-18T00:00:00.000Z",
  "successor_url": null,
  "hardware_notes": null,
  "known_limitations": [
    "Score meaning differs between v0 and v1 model generations; compare like with like."
  ],
  "upstream_updated_at": "2026-10-17T05:57:47.000Z"
}
```

Evidence claims:
- [upstream_claim] README: VMAF is an Emmy-winning perceptual video quality algorithm; package includes libvmaf C library and Python tools to train custom models; libvmaf includes PSNR, PSNR-HVS, SSIM, MS-SSIM, CIEDE2000. · locator: README, intro paragraphs · source: https://github.com/Netflix/vmaf
- [sourced_fact] README news dated 2026-06: new VMAF v1 models released; v0 models remain documented; libvmaf v3.0.0 released 2023-12-07. · locator: README, News section · source: https://github.com/Netflix/vmaf
- [sourced_fact] LICENSE file is BSD+Patent (SPDX BSD-2-Clause-Patent) with copyright Netflix 2020. · locator: LICENSE file, header · source: https://github.com/Netflix/vmaf/blob/master/LICENSE
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.

Rights:
- code: license=BSD-2-Clause-Patent hosting=permitted redistribution=permitted modification=permitted training=not_applicable · BSD+Patent with express patent grant, per LICENSE text; trained model files' separate terms not checked. · evidence: https://github.com/Netflix/vmaf/blob/master/LICENSE

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