ByteDance's PICO-MR team has introduced an innovative open-source 4D video generation framework named EX-4D. This framework excels at creating high-quality, multi-view 4D video sequences from monocular videos. Its cornerstone is the Depth Warped Mesh (DW-Mesh) technology, which adeptly handles complex scenes without the need for multi-view supervision. When paired with a pre-trained depth prediction model, EX-4D addresses the challenge of occluded areas, maintaining physical consistency and detail integrity even in extreme viewing angles. Furthermore, EX-4D incorporates two mask generation strategies to mitigate the shortage of multi-view training data. Evaluations demonstrate that EX-4D outperforms existing open-source methods across multiple metrics, particularly in extreme viewing conditions. Built upon the WAN-2.1 model and featuring a lightweight adaptive architecture, the framework is well-suited for deployment in resource-constrained environments.