> ## 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.

# bluesky.media.video_size_max

> Each video must be ≤ 100 MB.

## What it checks

`byteLength <= 100_000_000` for video items.

## Why

Bluesky's video service caps individual video blobs at 100 MB. Beyond that the upload is rejected before transcoding.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "bluesky.media.video_size_max",
    "platform": "bluesky",
    "message": "Video is 156000000 bytes; Bluesky allows at most 100000000.",
    "remediation": "Compress the video under 100000000 bytes (100 MB)."
  }
}
```

## Remediation

Re-encode at a lower bitrate. For 1080p H.264, \~5 Mbps is plenty:

```sh theme={"system"}
ffmpeg -i input.mp4 -c:v libx264 -b:v 5M -c:a aac -b:a 128k -movflags +faststart output.mp4
```

If the video is long, consider a short clip + linking to the full version on a host that doesn't have a 100 MB cap.

## Related

* [`bluesky.media.mime_allowed`](/preflight/bluesky-media-mime_allowed) — mp4 only.