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What it checks

byteLength <= 100_000_000 for video items.

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Why

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

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Failure response

{
  "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)."
  }
}

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Remediation

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