SoulX-FlashTalk: Real-Time Infinite Streaming of Audio-Driven Avatars via Self-Correcting Bidirectional Distillation

Deploying massive diffusion models for real-time, infinite-duration, audio-driven avatar generation presents a significant engineering challenge, primarily due to the conflict between computational load and strict latency constraints. Existing approaches often compromise visual fidelity by enforcing strictly unidirectional attention mechanisms or reducing model capacity. To address this problem, we introduce $\mathbf{\text{SoulX-FlashTalk}}$, a 14B-parameter framework optimized for high-fidelity real-time streaming. Diverging from conventional unidirectional paradigms, we use a $\mathbf{\text{Self-correcting}}\mathbf{\text{Bidirectional}}\mathbf{\text{Distillation}}$ strategy that retains bidirectional attention within video chunks. This design preserves critical spatiotemporal correlations, significantly enhancing motion coherence and visual detail. To ensure stability during infinite generation, we incorporate a $\mathbf{\text{Multi-step}}\mathbf{\text{Retrospective}}\mathbf{\text{Self-Correction}}\mathbf{\text{Mechanism}}$, enabling the model to autonomously recover from accumulated errors and preventing collapse. Furthermore, we engineered a full-stack inference acceleration suite incorporating hybrid sequence parallelism, Parallel VAE, and kernel-level optimizations. Extensive evaluations confirm that SoulX-FlashTalk is the first 14B-scale system to achieve a $\mathbf{\text{sub-second}}\mathbf{\text{start-up}}\mathbf{\text{latency}}\mathbf{\text{(0.87s)}}$ while reaching a real-time throughput of $\mathbf{\text{32}}\mathbf{\text{FPS}}$, setting a new standard for high-fidelity interactive digital human synthesis.