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What it checks

byteLength <= 1_000_000_000 per video.

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Why

Meta’s Threads docs cap per-video at 1 GB on the create-container endpoint. Beyond that the upstream rejects before the post becomes visible.

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Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "threads.media.video_size_max",
    "platform": "threads",
    "message": "Video is 1450000000 bytes; Threads allows at most 1000000000.",
    "remediation": "Compress the video under 1000000000 bytes (Threads's per-video limit is 1 GB)."
  }
}

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Remediation

Re-encode at a lower bitrate or split the post. For 1080p, 6 Mbps is a generous ceiling: 
ffmpeg -i input.mp4 -c:v libx264 -b:v 6M -c:a aac -b:a 128k -movflags +faststart output.mp4