# @remotion/webcodecs

> In-browser video and audio conversion library powered by the WebCodecs API.

An experimental JavaScript package from Remotion designed to process, convert, and manipulate media directly in the browser using the WebCodecs API and GPU acceleration. It handles format transcoding, resizing, rotation, and fixing buggy browser recordings without relying on slower WebAssembly builds. Remotion is currently phasing out this package in favor of Mediabunny.

Website: https://remotion.dev/docs/webcodecs

## What it is for

- Convert video containers and codecs client-side without uploading files to a server
- Rotate and resize user-uploaded videos directly in the browser
- Fix missing duration metadata and seeking issues in videos captured via MediaRecorder
- Extract video frames at specific timestamps for thumbnails or preview generation
- Resample audio tracks to 16kHz for client-side transcription models like Whisper

## Features

- Client-side video and audio transcoding using native WebCodecs
- GPU-accelerated processing that outperforms WebAssembly-based FFmpeg ports
- Format conversion between MP4, WebM, WAV, and others
- Frame extraction and pixel manipulation tools
- Video rotation and resizing utilities
- Audio resampling and track-level stream selection
- Filesystem integration via File System Access API and ArrayBuffer writing
- Pause, resume, and abort controllers for conversion jobs

## Pricing

Freemium. Free for individuals and teams up to 3; commercial company license required for 4+ people.

## Details

- Type: Web app
- Category: [Development](https://xiry.app/topics/development.md)
- Open source: no
- Platforms: Web, Code library
- For: Frontend web developers building client-side video editing and conversion tools.
- Alternative to: ffmpeg.wasm
- Tags: webcodecs, remotion, video, transcoding, javascript, media

## Why it was saved

- [@JNYBGR, 31 August 2025](https://x.com/JNYBGR/status/1962192414157783116): Second of the two 'FFmpeg for the web' efforts; browser video conversion with convert/resize/rotate/mirror controls.

## Related

- [Remotion Convert](https://xiry.app/resources/remotion-convert): In-browser video and audio conversion running locally without uploads (Web app, Free)
- [Mediabunny](https://xiry.app/resources/mediabunny): Fast, dependency-free JavaScript media toolkit for browser-based video and audio processing (Web app, Open source)
- [webcodecs-scroll-sync](https://xiry.app/resources/webcodecs-scroll-sync): Synchronize video playback to page scroll using the WebCodecs API (Web app, Open source)
- [Motion](https://xiry.app/resources/motion): Open-source animation library for React, Vue, and vanilla JavaScript (Website, Freemium)
- [Anime.js](https://xiry.app/resources/anime-js): Lightweight, modular JavaScript animation engine for CSS, SVG, and DOM elements (Website, Open source)
- [Remotion Agent Skills](https://xiry.app/resources/remotion-agent-skills): Agent skills enabling AI coding agents to create programmatic Remotion videos (GitHub repo, Open source)

Updated 10 October 2026. Page: https://xiry.app/resources/remotion-webcodecs

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