{
  "source": "https://archive.org/details/midnight-mystery_1930",
  "duration_seconds": 4120.449666666666,
  "time_origin": "00:00:00 is the first frame of the downloaded IA MP4, including opening logo and credits.",
  "evidence_used": [
    "film frames",
    "film audio",
    "on-screen credits and title cards",
    "archive media-file inventory and checksums only"
  ],
  "excluded": [
    "existing plot summaries",
    "reviews",
    "external cast/character lists",
    "web searches",
    "local vault plot data"
  ],
  "visual_sampling": "Entire runtime every 10 seconds; selected sequences at 1–5 second intervals. This is sampled visual inspection, not continuous human playback.",
  "transcription": "Local faster-whisper. Preserve raw ASR; mark unclear words and contextual rather than acoustically verified speaker attribution.",
  "video_md5": "286dfb555658a35366bea376ca630345",
  "timing_limits": "Frame timestamps identify source video positions. Dialogue and word timestamps are machine alignments and are approximate; speaker-turn boundaries are contextual, not verified by direct listening.",
  "audio_access_limit": "The AI-assisted review used local speech recognition for dialogue rather than direct listening."
}