- Fixed video generation parameters to match OpenAI's API format
- Convert resolution + aspect_ratio to 'size' parameter (e.g., '1920x1080')
- Convert duration to 'seconds' string format (e.g., '5s')
- Filter out fps parameter for OpenAI (not supported)
- Use 'input_reference' instead of 'image_url' for image-to-video
- Added SaveVideoNode to download and save videos locally
- Supports timestamp placeholders in filenames
- Auto-creates output directories
- Shows file size after download
- Updated QUICKSTART guide with video generation examples
- Updated API client documentation with correct parameter formats