VideoSys provides an easy-to-use system for video generation based on diffusion transformers. It supports multiple open-source video generation models including CogVideoX, Vchitect-2.0, Open-Sora-Plan, and Latte. The system implements acceleration techniques such as Pyramid Attention Broadcast (PAB) for real-time generation and Dynamic Sequence Parallel (DSP) for efficient training of variable-length sequences. The Data-Centric Parallel (DCP) method is also proposed for efficient training of variable sequences.