## Input formats

### Audio

| Format | Extensions |
| --- | --- |
| WAV | `.wav` |
| AIFF | `.aiff`, `.aif` |
| FLAC | `.flac` |
| MP3 | `.mp3` |
| AAC | `.aac`, `.m4a` |

For best results, use **WAV at 16-bit or 24-bit depth**. Supports up to 192kHz sample rate. Provide a stereo or mono track.

### Video

| Format | Extensions | Audio codec |
| --- | --- | --- |
| MP4 | `.mp4` | AAC or PCM |
| MOV | `.mov` | AAC or PCM |

Only the audio stream is processed — video content is ignored.

### Text

| Format | Extensions | Use case |
| --- | --- | --- |
| JSON | `.json` | Transcript input for the `alignment` model |
| TXT | `.txt` | Transcript input for the `alignment` model |

## Output formats

Set output formats in the `formats` array when [creating a Task](https://developer.audioshake.ai/api-reference/tasks/create). Use the API value shown below.

### Audio

| Format | API value | Models |
| --- | --- | --- |
| WAV | `wav` | All models that output audio |
| MP3 | `mp3` | All models that output audio |
| FLAC | `flac` | All models that output audio |
| AIFF | `aiff` | All models that output audio |

### Video

| Format | API value | Models |
| --- | --- | --- |
| MP4 | `mp4` | All models that output audio |

Output video files contain the separated audio stream in the original video container.

### Text

| Format | API value | Models |
| --- | --- | --- |
| JSON | `json` | `transcription`, `alignment`, `music_detection` |
| SRT | `srt` | `transcription`, `alignment` |
| TXT | `txt` | `transcription`, `alignment`, `music_detection` |

## Limitations

- Encrypted or DRM-protected content is not supported
- Multi-channel or surround formats (e.g. 5.1) are not supported