> ## Documentation Index
> Fetch the complete documentation index at: https://docs.moderationapi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Analyze audio

> How audio moderation works, supported formats, limits, and transcription quality settings.

## How it works

Audio files are automatically transcribed to text using speech recognition, then the transcript is analyzed by all enabled text-based policies. This means any policy that works on text (toxicity, hate, PII, wordlists, guidelines, etc.) also works on audio with zero additional configuration.

```javascript theme={"theme":"nord"}
const result = await moderationApi.content.submit({
  content: {
    type: "audio",
    url: "https://example.com/audio.mp3",
  },
});
```

## Supported audio formats

Any format FFmpeg can decode is supported. All audio is internally converted to 16 kHz mono WAV before transcription.

| Format | Extensions             |
| ------ | ---------------------- |
| MP3    | `.mp3`                 |
| WAV    | `.wav`                 |
| AAC    | `.aac`, `.m4a`         |
| OGG    | `.ogg`, `.oga`         |
| Opus   | `.opus`                |
| FLAC   | `.flac`                |
| WebM   | `.webm`                |
| AMR    | `.amr`                 |
| WMA    | `.wma`                 |
| MP4    | `.mp4`, `.m4a`, `.mov` |

## Limits

| Constraint           | Value                     |
| -------------------- | ------------------------- |
| Max file size        | 50 MB                     |
| Max audio duration   | 10 minutes                |
| Processing timeout   | 30 seconds                |
| URL schemes          | `http`, `https` only      |
| Private/internal IPs | Blocked (SSRF protection) |

## Transcription quality

You can configure transcription quality per channel in the dashboard under **Content > Audio > Transcription quality**.

| Setting         | Label    | Use case                             | Relative speed |
| --------------- | -------- | ------------------------------------ | -------------- |
| SPEED (default) | Fast     | Real-time moderation, high volume    | Fastest        |
| BALANCED        | Balanced | General purpose, good accuracy       | \~2x slower    |
| ACCURACY        | Accurate | Noisy audio, critical content review | \~3x slower    |

## Usage and billing

Each audio moderation request costs **2 units**: 1 for transcription + 1 for policy analysis.