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Every avatar frame carries an invisible mark. A reader that knows the pattern recovers the text akapulu. The mark stays in the picture through a normal recording, including a Daily cloud recording. The This is AI card is a separate overlay. show_ai_label controls the card. Turning the card off leaves the mark.

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Check a file

The file is an mp4, at most 200MB, with content type video/mp4.
  1. POST /api/video-marks/ with {"content_type":"video/mp4"}. The response includes id and upload_url. The upload URL lasts 15 minutes.
  2. PUT the mp4 bytes to upload_url with Content-Type: video/mp4.
  3. POST /api/video-marks/<id>/read/ with {}.
The read scores the file and deletes it. The response includes:
  • match — the recovered bits are akapulu
  • bits_correct and bits — how many of the 56 bits matched
  • separation — how far the two bit classes sit apart
  • width and height — the file’s picture size
  • scored_width and scored_height — the size used for the score
A 1280×720 picture is scored at that size. A different size is scored as-is and again after a scale back to 1280×720. The response keeps the stronger separation. A second read of the same id is 409 with error_code ALREADY_READ. The read body cannot include a URL. If the object is missing, the read is 404 and the check stays unread. Request and response fields are in Create a video mark and Read a video mark.