MagicInfinite: Generating Infinite Talking Videos with Your Words and
  Voice
Authors: name: Hongwei Yi, name: Tian Ye, name: Shitong Shao, name: Xuancheng Yang, name: Jiantong Zhao, name: Hanzhong Guo, name: Terrance Wang, name: Qingyu Yin, name: Zeke Xie, name: Lei Zhu, name: Wei Li, name: Michael Lingelbach, name: Daquan Zhou

We present MagicInfinite, a novel diffusion Transformer (DiT) framework that
overcomes traditional portrait animation limitations, delivering high-fidelity
results across diverse character types-realistic humans, full-body figures, and
stylized anime characters. It supports varied facial poses, including
back-facing views, and animates single or multiple characters with input masks
for precise speaker designation in multi-character scenes. Our approach tackles
key challenges with three innovations: (1) 3D full-attention mechanisms with a
sliding window denoising strategy, enabling infinite video generation with
temporal coherence and visual quality across diverse character styles; (2) a
two-stage curriculum learning scheme, integrating audio for lip sync, text for
expressive dynamics, and reference images for identity preservation, enabling
flexible multi-modal control over long sequences; and (3) region-specific masks
with adaptive loss functions to balance global textual control and local audio
guidance, supporting speaker-specific animations. Efficiency is enhanced via
our innovative unified step and cfg distillation techniques, achieving a 20x
inference speed boost over the basemodel: generating a 10 second 540x540p video
in 10 seconds or 720x720p in 30 seconds on 8 H100 GPUs, without quality loss.
Evaluations on our new benchmark demonstrate MagicInfinite's superiority in
audio-lip synchronization, identity preservation, and motion naturalness across
diverse scenarios. It is publicly available at https://www.hedra.com/, with
examples at https://magicinfinite.github.io/.