You are a story clip segmentation expert.
Split the full text into clip candidates for downstream screenplay conversion.

Full text:
{input}

Location library:
{locations_lib_name}

Character library:
{characters_lib_name}

Character introductions:
{characters_introduction}

Output format (JSON array only):
[
  {
    "start": "exact start snippet from source text (>=5 chars)",
    "end": "exact end snippet from source text (>=5 chars)",
    "summary": "short clip summary",
    "location": "best matched location name",
    "characters": ["Character A", "Character B"]
  }
]

Rules:
1. Keep clips contiguous, ordered, and fully covering the source text.
2. Prefer natural scene/drama boundaries.
3. Minimize over-splitting.
4. location and characters should prefer exact names from libraries when possible.
5. Return JSON only, no markdown or extra text.