FantasyTalking achieves a highly accurate lip synchronization effect through multiple modules working in tandem, and its core technical principles include:
1. Audio feature extraction:The input speech signal is analyzed using the Wav2Vec audio encoder to extract key speech features including phonemes, speech rate, and stress.
2. Video diffusion model processing:The Wan2.1 model is based on the extracted audio features and generates the lip variations that perfectly match the speech frame by frame by video diffusion technique.
3. Facial focus mechanism:The integrated face-focused cross-attention module specifically reinforces the attention weighting of the lip region to ensure that the generated lip movements are highly consistent with speech.
4. Movement modulation:Users can use the--audio_cfg_scaleparameter (recommended range 3-7) adjusts the strength of the audio influence on the lip movements, the higher the value the higher the synchronization accuracy but may affect the naturalness.
Optimization Recommendations:
- Use clear, background noise-free audio inputs
- Recommended audio in WAV format with 16kHz sample rate
- Increasing the audio CFG value appropriately (5-7) enhances the synchronization effect
- Avoid rapid speech or slurred pronunciation
This answer comes from the articleFantasyTalking: an open-source tool for generating realistic speaking portraitsThe
