CINEMA: Coherent Multi-Subject Video Generation via MLLM-Based Guidance
Authors: name: Yufan Deng, name: Xun Guo, name: Yizhi Wang, name: Jacob Zhiyuan Fang, name: Angtian Wang, name: Shenghai Yuan, name: Yiding Yang, name: Bo Liu, name: Haibin Huang, name: Chongyang Ma

Video generation has witnessed remarkable progress with the advent of deep
generative models, particularly diffusion models. While existing methods excel
in generating high-quality videos from text prompts or single images,
personalized multi-subject video generation remains a largely unexplored
challenge. This task involves synthesizing videos that incorporate multiple
distinct subjects, each defined by separate reference images, while ensuring
temporal and spatial consistency. Current approaches primarily rely on mapping
subject images to keywords in text prompts, which introduces ambiguity and
limits their ability to model subject relationships effectively. In this paper,
we propose CINEMA, a novel framework for coherent multi-subject video
generation by leveraging Multimodal Large Language Model (MLLM). Our approach
eliminates the need for explicit correspondences between subject images and
text entities, mitigating ambiguity and reducing annotation effort. By
leveraging MLLM to interpret subject relationships, our method facilitates
scalability, enabling the use of large and diverse datasets for training.
Furthermore, our framework can be conditioned on varying numbers of subjects,
offering greater flexibility in personalized content creation. Through
extensive evaluations, we demonstrate that our approach significantly improves
subject consistency, and overall video coherence, paving the way for advanced
applications in storytelling, interactive media, and personalized video
generation.