the subtitle editor :)

Library and tools for working with MP4 files containing video, audio, subtitles, or metadata. The focus is on fragmented files. Includes mp4ff-info, mp4ff-encrypt, mp4ff-decrypt and other tools.

DataStream.js is a library for reading data from ArrayBuffers

APG: AV1 Portable Graphics File Format

Absolute luminance or bust!

Official repository of the ISO Base Media File Format Reference Software

Node Version Manager - POSIX-compliant bash script to manage multiple active node.js versions

High Efficiency Image File Format

Service Worker for MP4 files

HLS.js is a JavaScript library that plays HLS in browsers with support for MSE.

GPAC Ultramedia OSS for Video Streaming & Next-Gen Multimedia Transcoding, Packaging & Delivery

JavaScript version of GPAC's MP4Box tool