# 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="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)**

While Ango Hub will let you import and open videos with variable frame rate, and will attempt best-effort to determine how to display the segment timeline, **frame-level annotation on Variable Frame Rate (VFR) videos is not supported**. As such, the Ango Hub team can not and does not take responsibility for the accuracy of frame-level annotations created on VFR videos.

In videos with variable frame rate (VFR), the following warning is displayed:

![](https://3895963154-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTcOUG6rfWxqGM0N4db2P%2Fuploads%2FquJ5hHaXtkV4KoBxDPvF%2Floreshot-20260407-093315%402x.png?alt=media\&token=557e7657-7349-457d-9130-5589b44ce0dc)
{% 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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