Rethinking the Readout: Unlocking Video Backbones for AI-Generated Video Detection
AI-generated videos (AIGVs) contain subtle temporal artifacts from inter-frame inconsistencies. Standard global readouts in video backbones suppress local patch-level dynamics, hindering detection. The proposed V-PVP lightweight readout replaces the aggregation layer with parallel streams over patch velocity, adding ~0.5M parameters, achieving 95.28 AUC on AIGVDBench with frozen backbone.
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[Submitted on 16 Jul 2026]
Title:Rethinking the Readout: Unlocking Video Backbones for AI-Generated Video Detection
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Abstract:AI-generated videos (AIGVs) typically contain subtle temporal artifacts that arise from inter-frame inconsistencies rather than within individual frames. A detector that captures such artifacts should therefore benefit from video pretrained backbones over image only ones. In practice, however, video backbones with standard global readouts often fail to outperform strong image pretrained probes on AIGV benchmarks. We attribute this gap to excessive spatiotemporal aggregation in the readout. Video pretrained backbones tend to compress each frame into a single global descriptor. This compression suppresses local patch level temporal dynamics and discards inter patch relations, which are precisely the cues that AIGV detection most reliably depends on. Based on this, we propose Velocity Gated Patch Velocity Profiling (V-PVP), a lightweight readout that replaces only the aggregation layer with two parallel streams over the patch velocity field, adding only about $0.5$M trainable parameters. V-PVP serves as a general plug-and-play module that consistently improves performance across diverse video backbones under both end-to-end fine-tuning and linear probing settings. Our method reaches \textbf{95.28} AUC on AIGVDBench while keeping the backbone fully frozen. The results show that simply replacing the aggregation layer reactivates the temporal potential of frozen video backbones, restoring their advantage on AIGV detection. Code is available at this https URL.
Subjects:
Computer Vision and Pattern Recognition (cs.CV)
Cite as: arXiv:2607.15321 [cs.CV]
(or arXiv:2607.15321v1 [cs.CV] for this version)
https://doi.org/10.48550/arXiv.2607.15321
arXiv-issued DOI via DataCite
Submission history
From: Manni Cui [view email] [v1] Thu, 16 Jul 2026 07:57:31 UTC (448 KB)
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