SyncAnimation - A real-time audio-driven head motion generation framework developed by SUSTech and others.

What is SyncAnimation?

SyncAnimation is a real-time, end-to-end audio-driven framework for generating human pose and speaking head animations. It generates upper body poses and facial expressions, including lip movements, synchronized with the audio signal in real time, achieving high-precision and highly synchronized animation effects. Based on NeRF technology, the framework combines audio-to-pose and expression synchronization modules, enabling the generation of richly detailed head animations from monocular images or noisy input. It generates realistic facial details and natural dynamic changes while maintaining smooth animation.

Main functions of SyncAnimation

• Audio-driven real-time renderingBased on the NeRF-based end-to-end framework, it can generate speaking avatars and upper body postures in real time from audio signals, and supports two inference methods: "one-shot" and "zero-shot".
• High-precision pose and expression generationThe AudioPose Syncer and AudioEmotion Syncer modules enable stable, precise, and controllable mapping from audio to head posture and facial expressions, gradually generating upper body, head, and lip shapes synchronized with the audio.
• Seamless fusion and synchronous renderingThe High-Synchronization Human Renderer module ensures seamless integration of the head and upper body, enabling audio-synchronized lip movements without post-processing.
• Maintain identity information and detailsDuring silence, it can maintain consistency in facial expressions and upper body movements while preserving the character's identity information and facial details.
• High real-time performanceOn an NVIDIA RTX 4090 GPU, SyncAnimation achieves an inference speed of up to 41 FPS, making it the first method to generate audio in real time that synchronizes upper body and head movements.

The technical principle of SyncAnimation

• AudioPose SyncerThe AudioPose Syncer is responsible for mapping audio signals to dynamic head poses. Through audio feature extraction and pose prediction networks, it generates head pose offsets synchronized with the audio, converting them into pose parameters in the original space via inverse normalization. This ensures the stability and consistency of head pose with the audio, maintaining natural head movements even during periods of silence.
• AudioEmotion SyncerAudioEmotion Syncer focuses on generating facial expressions synchronized with audio. It drives changes in facial expressions through audio features, including details such as eyebrow movements and blinking, achieving natural emotional expression. It combines audio features and predicted coefficients to control expression changes, generating realistic head animations through implicit functions.
• High-Synchronization Human RendererThis function is responsible for seamlessly integrating head and upper body movements, achieving audio-synchronized lip movements. By optimizing the rendering process, it ensures that the generated avatar is visually highly synchronized with the audio, while preserving the character's identity information and facial details.

SyncAnimation project address

• Project official website:https://syncanimation.github.io/
• GitHub repository:https://github.com/syncanimation
• arXiv technical paper:https://arxiv.org/pdf/2501.14646

Application scenarios of SyncAnimation

• Virtual anchors and live streamingSyncAnimation can generate virtual character animations that are highly synchronized with audio in real time, making it suitable for scenarios such as news broadcasting and live teaching. It can directly render the upper body posture and head movements, avoiding the unnatural feeling of pasting the head back onto the body in traditional methods.
• Video conferencing and remote collaborationIn video conferencing, SyncAnimation can generate realistic virtual avatars through audio drivers, maintaining high-quality visual effects even when network bandwidth is limited.
• Animation Production and Visual EffectsIt can be used in animation production to quickly generate facial expressions and posture animations of characters using audio signals, improving production efficiency. It can also be used for character animation generation in film and television special effects, achieving more natural dynamic effects.
• Game developmentIn game development, SyncAnimation can be used to generate real-time animations for NPCs (non-player characters), making their movements and expressions more lifelike. This helps enhance game immersion and the player experience.
• Intelligent customer service and virtual assistantSyncAnimation can be used to generate animated avatars of virtual customer service representatives or assistants, which exhibit more natural expressions and postures when interacting with users.