147 lines
5.0 KiB
Markdown
147 lines
5.0 KiB
Markdown
<p align="center">
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<a href="#">
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<img alt="ffmpeg.wasm" width="128px" height="128px" src="https://github.com/ffmpegwasm/ffmpeg.wasm/raw/master/docs/images/ffmpegwasm-icon.png">
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</a>
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</p>
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# ffmpeg.wasm
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[](https://img.shields.io/node/v/@ffmpeg/ffmpeg.svg)
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[](https://github.com/ffmpegwasm/ffmpeg.wasm/actions)
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[](https://github.com/ffmpegwasm/ffmpeg.wasm/graphs/commit-activity)
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[](https://opensource.org/licenses/MIT)
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[](https://github.com/airbnb/javascript)
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[](https://www.npmjs.com/package/@ffmpeg/ffmpeg)
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[](https://www.npmjs.com/package/@ffmpeg/ffmpeg)
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ffmpeg.wasm is a pure Webassembly / Javascript port of FFmpeg. It enables video & audio record, convert and stream right inside browsers.
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**AVI to MP4 Demo**
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<p align="center">
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<a href="#">
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<img alt="transcode-demo" src="https://github.com/ffmpegwasm/ffmpeg.wasm/raw/master/docs/images/transcode.gif">
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</a>
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</p>
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Try it: [https://ffmpegwasm.github.io](https://ffmpegwasm.github.io#demo)
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## Installation
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**Node**
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```
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$ npm install @ffmpeg/ffmpeg @ffmpeg/core
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```
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> As we are using the latest experimental features, you need to add few flags to run in Node.js
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```
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$ node --experimental-wasm-threads --experimental-wasm-bulk-memory transcode.js
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```
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**Browser**
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Or, using a script tag in the browser (only works in Chrome):
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```html
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<script src="https://unpkg.com/@ffmpeg/ffmpeg@0.9.4/dist/ffmpeg.min.js"></script>
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<script>
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const { createFFmpeg } = FFmpeg;
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...
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</script>
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```
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> Only browsers with SharedArrayBuffer support can use ffmpeg.wasm, you can check [HERE](https://caniuse.com/sharedarraybuffer) for the complete list.
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## Usage
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ffmpeg.wasm provides simple to use APIs, to transcode a video you only need few lines of code:
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```javascript
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const fs = require('fs');
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const { createFFmpeg, fetchFile } = require('@ffmpeg/ffmpeg');
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const ffmpeg = createFFmpeg({ log: true });
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(async () => {
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await ffmpeg.load();
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ffmpeg.FS('writeFile', 'test.avi', await fetchFile('./test.avi'));
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await ffmpeg.run('-i', 'test.avi', 'test.mp4');
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await fs.promises.writeFile('./test.mp4', ffmpeg.FS('readFile', 'test.mp4'));
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process.exit(0);
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})();
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```
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### Use other version of ffmpeg.wasm-core / @ffmpeg/core
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For each version of ffmpeg.wasm, there is a default version of @ffmpeg/core (you can find it in **devDependencies** section of [package.json](https://github.com/ffmpegwasm/ffmpeg.wasm/blob/master/package.json)), but sometimes you may need to use newer version of @ffmpeg/core to use the latest/experimental features.
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**Node**
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Just install the specific version you need:
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```bash
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$ npm install @ffmpeg/core@latest
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```
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Or use your own version with customized path
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```javascript
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const ffmpeg = createFFmpeg({
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corePath: '../../../src/ffmpeg-core.js',
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});
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```
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**Browser**
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```javascript
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const ffmpeg = createFFmpeg({
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corePath: 'https://unpkg.com/@ffmpeg/core@0.8.3/dist/ffmpeg-core.js',
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});
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```
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For the list available versions and their changelog, please check: https://github.com/ffmpegwasm/ffmpeg.wasm-core/releases
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## Multi-threading
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Multi-threading need to be configured per external libraries, only following libraries supports it now:
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### x264
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Run it multi-threading mode by default, no need to pass any arguments.
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### libvpx / webm
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Need to pass `-row-mt 1`, but can only use one thread to help, can speed up around 30%
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## Documentation
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- [API](https://github.com/ffmpegwasm/ffmpeg.wasm/blob/master/docs/api.md)
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- [Supported External Libraries](https://github.com/ffmpegwasm/ffmpeg.wasm-core#configuration)
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## FAQ
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### What is the license of ffmpeg.wasm?
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There are two components inside ffmpeg.wasm:
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- @ffmpeg/ffmpeg (https://github.com/ffmpegwasm/ffmpeg.wasm)
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- @ffmpeg/core (https://github.com/ffmpegwasm/ffmpeg.wasm-core)
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@ffmpeg/core contains WebAssembly code which is transpiled from original FFmpeg C code with minor modifications, but overall it still following the same licenses as FFmpeg and its external libraries (as each external libraries might have its own license).
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@ffmpeg/ffmpeg contains kind of a wrapper to handle the complexity of loading core and calling low-level APIs. It is a small code base and under MIT license.
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### Can I use ffmpeg.wasm in Firefox?
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Sadly, no for now. You can check this issue for more details: https://github.com/ffmpegwasm/ffmpeg.wasm/issues/106
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But it might be possible one day.
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### What is the maximum size of input file?
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2 GB, which is a hard limit in WebAssembly. Might become 4 GB in the future.
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