gpac/mp4box.js

Health v2 · maintenance only

Adoption not part of the score

2463 stars · 391 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

MP4Box.js is a JavaScript/TypeScript library for parsing, segmenting, and extracting samples from MP4 (ISOBMFF) files, inspired by GPAC's MP4Box tool. It works progressively in both browser and Node.js environments, enabling MSE-based streaming and client-side file inspection.

Use cases

• parse mp4 files in javascript
• inspect mp4 metadata and box structure in the browser
• segment mp4 files for media source extensions playback
• extract media samples from mp4 tracks
• build adaptive streaming with fragmented mp4
• analyze isobmff box structure client-side
• extract subtitle tracks from mp4

When to choose

• you need to parse or fragment MP4 files in JavaScript in a browser or Node.js
• you want client-side MP4 inspection without uploading files to a server
• you are building MSE-based video players or adaptive streaming
• you need progressive parsing of media data as it loads

When to avoid

• you need full MP4 remuxing or transcoding capabilities of the native MP4Box tool
• you work with non-ISOBMFF container formats like MKV or AVI
• you need server-side heavy video encoding or processing

Facets

library · maturity active

parser video-processing developer-tools media web-development developer-tools browser cross-platform mp4 isobmff mse streaming typescript media-parsing video nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="gpac/mp4box.js")