# Supported Asset File Types & Codecs

## File Types

The following are the file types that can be annotated on Ango Hub:

| **Category**    | **Supported File Types**             |
| --------------- | ------------------------------------ |
| Audio           | .mp3, .wav, .ogg                     |
| Image           | .jpg, .jpeg, .png, .tif, .tiff, .bmp |
| Video           | .mp4, .webm, .mov, .mkv              |
| Text            | .txt, .md                            |
| Document        | .pdf                                 |
| Medical Imaging | .dcm, .nrrd, .nii, .nii.gz           |

{% hint style="info" %}
NRRD files must be compatible 3D medical volumes. See [NRRD File Compatibility](/data/data-in-ango-hub/nrrd-file-compatibility.md) for the exact NRRD files Ango Hub can and cannot open.
{% endhint %}

{% hint style="warning" %}
Because `.mov` playback support can vary by operating system and browser, Ango Hub cannot guarantee that every `.mov` file will play correctly on every device. When possible, prefer `.mp4` files encoded with H.264 for video labeling workflows.
{% endhint %}

{% hint style="danger" %}
Audio files **must** have a constant bitrate.

Otherwise, the annotation timings will **not** be correct in the final export.
{% endhint %}

{% hint style="danger" %}
**Frame-specific annotations not officially supported on videos with variable frame rate (VFR)**

Ango Hub can import and open VFR videos, but **frame-level annotation on Variable Frame Rate (VFR) videos is not supported**.

For details on what is affected, how the in-product warning works, and what we recommend instead, see [Variable Frame Rate (VFR) Video Compatibility](/data/data-in-ango-hub/variable-frame-rate-videos.md).
{% endhint %}

## Codecs

For the MP4 format, the supported codec is H.264.

Ango Hub supports all codecs supported by your web browser. See [this link to the MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Video_codecs) for more.


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