HunyuanVideo is a large-scale model for text-based video generation, adopting the “Dual-stream to Single-stream” hybrid model design to effectively process text and video data. 
1.
Dual-stream stage: Text and video tokens are processed independently through multiple Transformer blocks, allowing each modality to learn its own appropriate representation.
2.
Single-stream stage: Effective fusion of multimodal information is achieved by combining text and video tokens and feeding them to subsequent Transformer blocks.