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

# pinterest.video.mime_allowed

> Video bytes must be mp4, mov, or m4v.

## What it checks

After bytes resolve, the publisher inspects the resolved `mimeType` and rejects anything outside Pinterest's video allowlist.

Allowed: `video/mp4`, `video/quicktime`, `video/m4v`.

## Why

Pinterest's video upload pipeline accepts these container types only. Anything else surfaces from `POST /v5/media` as a vague registration failure or fails later during transcode — preflight catches it locally.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "pinterest.video.mime_allowed",
    "platform": "pinterest",
    "message": "Video mime type 'video/webm' is not allowed on Pinterest.",
    "remediation": "Use one of: video/mp4, video/quicktime, video/m4v."
  }
}
```

## Remediation

Re-mux to mp4:

```sh theme={"system"}
ffmpeg -i input.webm -c:v libx264 -c:a aac -movflags +faststart output.mp4
```

## Related

* [`pinterest.video.size_max`](/preflight/pinterest-video-size_max)