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docs/DEVELOPMENT.md

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+# Development Guide
+
+This document provides information for developers working on the video_probe project.
+
+## Prerequisites
+
+- Rust 1.70+ (https://rustup.rs/)
+- FFmpeg/ffprobe (for probing video files)
+
+## Build Commands
+
+```bash
+# Debug build
+cargo build
+
+# Release build
+cargo build --release
+
+# Run tests
+cargo test
+
+# Format code
+cargo fmt
+
+# Run linter
+cargo clippy
+```
+
+## Project Structure
+
+```
+video_probe/
+├── src/
+│   ├── main.rs      # CLI entry point
+│   ├── lib.rs       # Library interface
+│   ├── error.rs     # Error types
+│   ├── metadata.rs  # Data structures
+│   ├── probe.rs     # ffprobe execution
+│   ├── parser.rs    # JSON parsing
+│   └── output.rs    # Output formatting
+├── docs/
+│   ├── DEVELOPMENT.md
+│   ├── USAGE.md
+│   └── API.md
+├── Cargo.toml
+└── README.md
+```
+
+## Code Conventions
+
+- Structs/Enums: PascalCase (e.g., VideoMetadata)
+- Functions/Methods: snake_case (e.g., probe_video)
+- Variables: snake_case (e.g., video_path)
+
+## Testing
+
+```bash
+# Run all tests
+cargo test
+
+# Run with output
+cargo test -- --nocapture
+```