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87 lines
2.5 KiB
Markdown
87 lines
2.5 KiB
Markdown
---
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description: The @mediabunny/aac-encoder extension provides a fast AAC encoder polyfill for use in the browser and on the server.
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---
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# @mediabunny/aac-encoder
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Some browsers lack support for AAC encoding in their WebCodecs implementations. This extension package provides a reliable AAC-LC encoder for use with Mediabunny. It is implemented using Mediabunny's [custom coder API](../supported-formats-and-codecs#custom-coders) and uses a fast, size-optimized WASM build of [FFmpeg](https://ffmpeg.org/)'s AAC encoder under the hood.
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<a class="!no-underline inline-flex items-center gap-1.5" :no-icon="true" href="https://github.com/Vanilagy/mediabunny/blob/main/packages/aac-encoder/README.md">
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GitHub page
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<span class="vpi-arrow-right" />
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</a>
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## Installation
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This library peer-depends on Mediabunny. Install both using npm:
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```bash
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npm install mediabunny @mediabunny/aac-encoder
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```
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Alternatively, directly include them using a script tag:
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```html
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<script src="mediabunny.js"></script>
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<script src="mediabunny-aac-encoder.js"></script>
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```
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This will expose the global objects `Mediabunny` and `MediabunnyAacEncoder`. Use `mediabunny-aac-encoder.d.ts` to provide types for these globals. You can download the built distribution files from the [releases page](https://github.com/Vanilagy/mediabunny/releases).
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## Usage
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```ts
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import { registerAacEncoder } from '@mediabunny/aac-encoder';
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registerAacEncoder();
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```
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That's it - Mediabunny now uses the registered AAC encoder automatically.
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If you want to be more correct, check for native browser support first:
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```ts
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import { canEncodeAudio } from 'mediabunny';
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import { registerAacEncoder } from '@mediabunny/aac-encoder';
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if (!(await canEncodeAudio('aac'))) {
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registerAacEncoder();
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}
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```
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## Example
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Here, we convert an input file to an MP4 with AAC audio:
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```ts
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import {
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Input,
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ALL_FORMATS,
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BlobSource,
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Output,
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BufferTarget,
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Mp4OutputFormat,
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canEncodeAudio,
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Conversion,
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} from 'mediabunny';
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import { registerAacEncoder } from '@mediabunny/aac-encoder';
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if (!(await canEncodeAudio('aac'))) {
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// Only register the custom encoder if there's no native support
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registerAacEncoder();
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}
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const input = new Input({
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source: new BlobSource(file), // From a file picker, for example
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formats: ALL_FORMATS,
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});
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const output = new Output({
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format: new Mp4OutputFormat(),
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target: new BufferTarget(),
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});
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const conversion = await Conversion.init({
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input,
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output,
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});
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await conversion.execute();
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output.target.buffer; // => ArrayBuffer containing the MP4 file
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```
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