- Add CGO configuration with pkg-config for FFmpeg libraries
- Implement FormatContext for input/output operations
- Add Stream and CodecParameters wrappers
- Implement Codec/Context with encode/decode API
- Add Frame and Packet wrappers for media data
- Include error types and FFmpegError
- Add CLI tool and simple-transcode example
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>