Tarsier2: Advancing Large Vision-Language Models from Detailed Video
  Description to Comprehensive Video Understanding
Authors: name: Liping Yuan, name: Jiawei Wang, name: Haomiao Sun, name: Yuchen Zhang, name: Yuan Lin

We introduce Tarsier2, a state-of-the-art large vision-language model (LVLM)
designed for generating detailed and accurate video descriptions, while also
exhibiting superior general video understanding capabilities. Tarsier2 achieves
significant advancements through three key upgrades: (1) Scaling pre-training
data from 11M to 40M video-text pairs, enriching both volume and diversity; (2)
Performing fine-grained temporal alignment during supervised fine-tuning; (3)
Using model-based sampling to automatically construct preference data and
applying DPO training for optimization. Extensive experiments show that
Tarsier2-7B consistently outperforms leading proprietary models, including
GPT-4o and Gemini 1.5 Pro, in detailed video description tasks. On the DREAM-1K
benchmark, Tarsier2-7B improves F1 by 2.8\% over GPT-4o and 5.8\% over
Gemini-1.5-Pro. In human side-by-side evaluations, Tarsier2-7B shows a +8.6\%
performance advantage over GPT-4o and +24.9\% over Gemini-1.5-Pro. Tarsier2-7B
also sets new state-of-the-art results across 15 public benchmarks, spanning
tasks such as video question-answering, video grounding, hallucination test,
and embodied question-answering, demonstrating its versatility as a robust
generalist vision-language model.