- Remove redundant VideoFromFile class implementations from vidu_extend.py, vidu_i2v.py, vidu_ref2v.py, vidu_startend2v.py, and vidu_t2v.py
- Remove duplicate VideoFromFile fallback from wan_ai_i2v.py and wan_ai_t2v.py
- Simplify import logic by relying on comfy library's VideoFromFile implementation
- Reduce code duplication across multiple video generation modules
- Improve maintainability by centralizing video handling logic