Vidi2: Large Multimodal Models for Video Understanding and Creation

• URL: http://arxiv.org/abs/2511.19529v1
• Date: Mon, 24 Nov 2025 07:58:29 GMT
• Title: Vidi2: Large Multimodal Models for Video Understanding and Creation
• Authors: Vidi Team, Celong Liu, Chia-Wen Kuo, Chuang Huang, Dawei Du, Fan Chen, Guang Chen, Haoji Zhang, Haojun Zhao, Lingxi Zhang, Lu Guo, Lusha Li, Longyin Wen, Qihang Fan, Qingyu Chen, Rachel Deng, Sijie Zhu, Stuart Siew, Tong Jin, Weiyan Tao, Wen Zhong, Xiaohui Shen, Xin Gu, Zhenfang Chen, Zuhua Lin,
• Abstract summary: Vidi2 video understanding with finegrained-temporal grounding (STG) and advances its capability to video question answering (Video QA)<n>Given a text query, Vidi2 can identify not only the corresponding timestamps but also the bounding boxes of target objects within the output time ranges.<n>This end-to-endUE-temporal grounding capability enables potential applications in complex editing scenarios.
• Score: 39.82972197371385
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Video has emerged as the primary medium for communication and creativity on the Internet, driving strong demand for scalable, high-quality video production. Vidi models continue to evolve toward next-generation video creation and have achieved state-of-the-art performance in multimodal temporal retrieval (TR). In its second release, Vidi2 advances video understanding with fine-grained spatio-temporal grounding (STG) and extends its capability to video question answering (Video QA), enabling comprehensive multimodal reasoning. Given a text query, Vidi2 can identify not only the corresponding timestamps but also the bounding boxes of target objects within the output time ranges. This end-to-end spatio-temporal grounding capability enables potential applications in complex editing scenarios, such as plot or character understanding, automatic multi-view switching, and intelligent, composition-aware reframing and cropping. To enable comprehensive evaluation of STG in practical settings, we introduce a new benchmark, VUE-STG, which offers four key improvements over existing STG datasets: 1) Video duration: spans from roughly 10s to 30 mins, enabling long-context reasoning; 2) Query format: queries are mostly converted into noun phrases while preserving sentence-level expressiveness; 3) Annotation quality: all ground-truth time ranges and bounding boxes are manually annotated with high accuracy; 4) Evaluation metric: a refined vIoU/tIoU/vIoU-Intersection scheme. In addition, we upgrade the previous VUE-TR benchmark to VUE-TR-V2, achieving a more balanced video-length distribution and more user-style queries. Remarkably, the Vidi2 model substantially outperforms leading proprietary systems, such as Gemini 3 Pro (Preview) and GPT-5, on both VUE-TR-V2 and VUE-STG, while achieving competitive results with popular open-source models with similar scale on video QA benchmarks.

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