Transcribes one audio or video file the user owns or may use into timestamped text with SRT and VTT captions. Best for: "transcribe this podcast episode", "make subtitles for my video", "what is said in this file". Returns: language, length, timestamped segments, SRT and VTT (trim with include), transcript_id, expires_at (kept 24 hours, the media is never kept), minutes left today, and library_id when the caller has no user id. Input tips: give file (an upload) or url (a public TikTok, Instagram or other social video, or a direct media link), not both. Set confirm_rights true only after the user says they own the recording or have the rights (a public social video needs none); otherwise ask. Pass library_id from an earlier answer to keep transcripts in one library. Not for: YouTube (call get_transcript), private videos, over 15 MiB (15,728,640 bytes) or 15 minutes, whole channels. Formats: mp3, m4a, mp4, wav, ogg, flac, webm. A daily allowance of minutes applies.