Localization of forgeries in MPEG-2 video through GOP size and DQ analysis
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D. Labartino, T. Bianchi, A. De Rosa, M. Fontani, D. Vázquez-Padín, A. Piva, M. Barni,
“Localization of forgeries in MPEG-2 video through GOP size and DQ analysis”,
Proceedings of the 2013 IEEE International Workshop on Multimedia Signal Processing, Sept. 2013,  Pula, Sardinia, Italy

This work addresses forgery localization in MPEG-2 compressed videos. The proposed method is based on the analysis of Double Quantization (DQ) traces in frames that were encoded twice as intra (i.e., I-frames). Employing a state-of-the-art method, such frames are located in the video under analysis by estimating the size of the Group Of Pictures (GOP) that was used in the first compression; then, the DQ analysis is devised for the MPEG-2 encoding scheme and applied to frames that were intra-coded in both the first and second compression. In such a way, regions that were manipulated between the two encodings are detected. Compared to existing methods based on double quantization analysis, the proposed scheme makes forgery localization possible on a wider range of settings.