HunyuanVideo — Tencent’s 13B‑Parameter Open‑Source AI Video (Research Overview)

TL;DR
HunyuanVideo (reported ~13B params) introduces dual‑stream fusion and video‑to‑audio synthesis in public materials.
It is open‑sourced (see repo/license); performance depends on setup and prompts.
Use official docs/papers for benchmarks and compare responsibly.

1 The open-source video breakthrough we've been waiting for

December 3rd, 2024 introduced HunyuanVideo — a ~13‑billion parameter open‑source project. Competitive positioning vs. closed‑source models depends on evaluation scope and criteria.

1.1 By the numbers

Benchmarks vary by prompt set, settings and methodology; consult the paper/repo.

2 Technical architecture that changes everything

2.1 Dual-stream to single-stream fusion

HunyuanVideo's secret weapon is its dual-stream architecture that processes video and text tokens independently before fusing them:

Phase 1: Dual-Stream Processing

• Video tokens → Independent Transformer blocks
• Text tokens → Separate modulation mechanisms
• Result → Zero cross-contamination during feature learning

Phase 2: Single-Stream Fusion

• Input → Concatenated video + text tokens
• Processing → Joint Transformer processing
• Output → Multimodal information fusion

2.2 Revolutionary video-to-audio synthesis

The V2A (Video-to-Audio) module automatically analyzes video content and generates synchronized:

• Footstep audio matching character movement
• Ambient soundscapes fitting the environment
• Background music aligned with scene emotion