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Deep learning (DL) methods have shown significant promise in detecting such manipulations; however, inconsistencies in application, the absence of standardized pipelines and limited cross-dataset generalization hinder their reliable deployment in real-world scenarios. This work presents a comprehensive evaluation of Transformer- and CNN-based architectures for video deepfake detection. Multiple benchmark datasets, along with a novel facial-reenactment dataset, are used to investigate cross-dataset generalization and pretraining with limited fine-tuning on small target subsets (10\u201330%). Additionally, we analyze the impact of temporal window length on detection performance. Experimental results demonstrate that TimeSformer consistently achieves the highest performance, reaching 78.4% accuracy, 0.801 area under the curve (AUC) and 77.0% F1-score with 96-frame clips and 30% fine-tuning, confirming the advantage of joint spatiotemporal modeling. All models benefit from moderate fine-tuning, with gains plateauing beyond 20%. Increasing clip length enhances performance for temporally aware models, highlighting the importance of extended temporal context. Overall, this study provides empirical evidence into the strengths and limitations of current architectures, offering guidance for future research and practical deployment of robust and generalizable deepfake detectors.<\/jats:p>","DOI":"10.1007\/s00138-026-01809-w","type":"journal-article","created":{"date-parts":[[2026,4,7]],"date-time":"2026-04-07T14:32:15Z","timestamp":1775572335000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Cross-dataset video deepfake detection using Transformer and CNN architectures"],"prefix":"10.1007","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3371-569X","authenticated-orcid":false,"given":"Georgios","family":"Petmezas","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,4,7]]},"reference":[{"issue":"6","key":"1809_CR1","doi-asserted-by":"publisher","first-page":"607","DOI":"10.1049\/bme2.12031","volume":"10","author":"P Yu","year":"2021","unstructured":"Yu, P., Xia, Z., Fei, J., Lu, Y.: A survey on deepfake video detection. 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