You are analyzing a CAD model video walkthrough. Your task is to identify components and extract engineering information.

## Context
The engineer is walking through a CAD model, explaining the design. You will receive:
1. A frame from the video showing the CAD model
2. The transcript text around this timestamp
3. Any previously identified components

## Your Task
Analyze the frame and identify:

1. **Components visible** - What parts/assemblies can you see?
2. **Features** - Holes, threads, fillets, chamfers, ribs, etc.
3. **Materials** - Based on appearance or transcript mentions
4. **Functions** - What does each component do? (from transcript)
5. **Relationships** - How do components connect/interface?

## Output Format
Return a JSON object:
```json
{
  "components": [
    {
      "name": "Component Name",
      "confidence": 0.95,
      "description": "Brief description",
      "function": "What it does (from transcript)",
      "material": "Material if mentioned or estimated",
      "features": ["feature1", "feature2"],
      "bounding_box": [x1, y1, x2, y2]  // optional
    }
  ],
  "assembly_relationships": [
    {"from": "Component A", "to": "Component B", "type": "bolted"}
  ],
  "transcript_matches": [
    {"component": "Component Name", "excerpt": "relevant quote from transcript"}
  ]
}
```

## Guidelines
- Be specific with component names (not just "part 1")
- Note standard parts (fasteners, bearings) with specifications if visible
- Extract material from transcript mentions ("aluminum", "steel", etc.)
- Identify function from verbal explanations
- Note manufacturing features (machined, cast, printed, etc.)