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Cnn-Based Video Codec Classifier For Multimedia Forensics

Rodrigo Pessoa, Anil Kokaram, Francois Pitie, Mark Sugrue

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20 Sep 2021

In video forensics, identification of codec type is complicated by a lack of standards compliant compressed bitstreams. Previous work is unable to identify codec types without actually decoding the file successfully. This paper presents a CNN classifier derived from the AlexNet architecture that can detect codec types without decoding the bitstream. It is based on classification of the raw bitstream data itself without decoding. The algorithm is tested on real data in a video forensics setting as well as user generated content supplied in the YouTube test set. Our results show better than 96.73% accuracy with over 43 combinations of codec/containers and, at least, 88.59% accuracy at 20% data corruption across both test sets.

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