Video with no audio is rejected for having none. A file with a video track is
accepted and marked had_video; every state of its page (queued, transcribing,
done, failed) says only its audio was used and the video was discarded, and a
plain audio file shows no such notice.
Red: the had_video column does not exist.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>