  Customized text-to-video generation aims to generate text-guided videos with
customized user-given subjects, which has gained increasing attention recently.
However, existing works are primarily limited to generating videos for a single
subject, leaving the more challenging problem of customized multi-subject
text-to-video generation largely unexplored. In this paper, we fill this gap
and propose a novel VideoDreamer framework. VideoDreamer can generate
temporally consistent text-guided videos that faithfully preserve the visual
features of the given multiple subjects. Specifically, VideoDreamer leverages
the pretrained Stable Diffusion with latent-code motion dynamics and temporal
cross-frame attention as the base video generator. The video generator is
further customized for the given multiple subjects by the proposed Disen-Mix
Finetuning and Human-in-the-Loop Re-finetuning strategy, which can tackle the
attribute binding problem of multi-subject generation. We also introduce
MultiStudioBench, a benchmark for evaluating customized multi-subject
text-to-video generation models. Extensive experiments demonstrate the
remarkable ability of VideoDreamer to generate videos with new content such as
new events and backgrounds, tailored to the customized multiple subjects. Our
project page is available at https://videodreamer23.github.io/.
