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arXiv · 2510.10395

AVoCaDO: An Audiovisual Video Captioner Driven by Temporal Orchestration

Xinlong Chen·Yue Ding·Weihong Lin·Jingyun Hua·Linli Yao·Yang Shi·Bozhou Li·Yuanxing Zhang·Qiang Liu·Pengfei Wan·Liang Wang·Tieniu Tan
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Abstract

Audiovisual video captioning aims to generate semantically rich descriptions with temporal alignment between visual and auditory events, thereby benefiting both video understanding and generation. In this paper, we present AVoCaDO, a powerful audiovisual video captioner driven by the temporal orchestration between audio and visual modalities. We propose a two-stage post-training pipeline: (1) AVoCaDO SFT, which fine-tunes the model on a newly curated dataset of 107K high-quality, temporally-aligned audiovisual captions; and (2) AVoCaDO GRPO, which leverages tailored reward functions to further enhance temporal coherence and dialogue accuracy while regularizing caption length and reducing collapse. Experimental results demonstrate that AVoCaDO significantly outperforms existing open-source models across four audiovisual video captioning benchmarks, and also achieves competitive performance on the VDC and DREAM-1K benchmark under visual-only settings.

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Xinlong Chen, Yue Ding, Weihong Lin, Jingyun Hua, Linli Yao, Yang Shi, Bozhou Li, Yuanxing Zhang, Qiang Liu, Pengfei Wan, Liang Wang, Tieniu Tan. 2025-10-12. AVoCaDO: An Audiovisual Video Captioner Driven by Temporal Orchestration. https://arxiv.org/abs/2510.10395

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