Media Fingerprinting

Media fingerprinting checks which video and audio codecs the browser supports, plus available media devices.

Collected signals

Video codecs tested: H.264 (baseline/high), H.265, AV1, VP8, VP9, Theora

Audio codecs tested: AAC, MP3, Vorbis, Opus, WAV, FLAC

Media devices: Enumerated via navigator.mediaDevices.enumerateDevices() (kind only, no labels)

Feature detection: MediaSession API, Picture-in-Picture support

Why it works

Codec support depends on:

• Browser engine (Chromium supports more codecs than Firefox)
• OS (macOS has hardware H.265, most Linux distros don't)
• Hardware decoders (GPU-accelerated AV1 on newer chips)

Entropy and stability

Property	Value
Entropy	~7 bits
Stability	0.85
Typical duration	5-7ms

Usage

const fp = await neoprint.get({ collectors: ['media'] })
const media = fp.components.media.value

console.log(media.videoCodecs)  // supported video formats
console.log(media.audioCodecs)  // supported audio formats
console.log(media.deviceKinds)  // ['audioinput', 'videoinput', 'audiooutput']