JS Expert Week 8.0 - 🎥Pre processing videos before uploading in the browser 😏

Pure re-encoding of an mp4-h264 video file with the web APIs as well as in-depth description of how it works.

Record a video in the browser or directly on the File System from a canvas region (2D/WebGL/WebGPU) as MP4, WebM, MKV, MOV, GIF, PNG/JPG Sequence using WebCodecs and Wasm when available.

Browser-based, hardware-accelerated video upload optimization

Get a codec parameter string (like 'avc1.4d002a') from human readable options (like { name: 'Main', level: '4.2' }) and back to a descriptive name ('AVC Main Profile Level 4.2').

High-performance asset optimization for FoundryVTT. Convert scene backgrounds to WebP and audio to OGG Opus directly in your browser using multi-threaded WebCodecs for faster load times and less bandwidth.

Nearsec Together is an open source P2P game streaming platform. It functions as a self hosted alternative to Steam Remote Play Together, allowing you to share your screen and play local couch co-op multiplayer games with friends over the internet with low latency

WebCodecs Opus Recorder/Media Source Extensions Opus EncodedAudioChunk Player

Video scrubbing with WebCodecs

Real-time datamosh library via WebCodecs. Inspired by hydra-datamosh by Empyflash.

WebRTC Video Encoder <--> WebCodecs VideoDecoder

websocket player

Chart Studio Web

图片素材管理器，支持右键收集以及生成图文和视频

把 SVG 变成手绘动画视频。导入 SVG → 自动逐笔绘制动画 → 加文字配音 → 导出 MP4。纯前端，零依赖，打开浏览器就能做科普视频。

🎥 Enhance video processing in Node.js with a WebCodecs API polyfill using libav for seamless multimedia handling.

Local-first video viewer and spatial crop tool. Sibling of RePic.

Client-side, visually-lossless video watermarker. Burns timed promo overlays into MP4 entirely in the browser via WebCodecs — no upload, native resolution/fps, zero dropped frames, audio passthrough, streams straight to disk.

KastorTube - fullstack project that pre-processes MP4 video to WebM on demand using Streams, WebCodecs, Web Workers and Canvas.

In-browser DVB TV player: client-side decode of raw MPEG-TS — WebCodecs HW video (H.264/H.265) + WASM AC-3/E-AC-3 audio, audio-master A/V sync. Zero server transcode. Built by AI-orchestrated delegation.