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MAVOS-DD: Multilingual Audio-Video Open-Set Deepfake Detection Benchmark

Florinel-Alin Croitoru Vlad Hondru Marius Popescu Radu Tudor Ionescu Fahad Shahbaz Khan Mubarak Shah
Oct 2026
Artificial Intelligence Machine Learning Computer Vision

Abstract

We present the first large-scale open-set benchmark for multilingual audio-video deepfake detection. Our dataset comprises nearly 350 hours of real and fake videos across eight languages, with 59% of data being generated. For each language, the fake videos are generated with several distinct audio and video deepfake generation models, selected based on their quality, via visual inspection. We organize the training, validation and test splits such that only a subset of the chosen generative models and languages are available during training, thus creating several challenging open-set evaluation setups. We perform experiments with various pre-trained and fine-tuned deepfake detectors proposed in recent literature. Our results show that state-of-the-art detectors are not currently able to maintain their performance levels when tested in our open-set scenarios. We publicly release our data and code for non-commercial use at https://github.com/CroitoruAlin/MAVOS-DD.

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