The design of a steganographic system based on the internal MP 4 file structures

We propose a new technique for inserting the information into the mp4 video files. This technique is based on a modification of the GOP (Group of Pictures) structure and alternation of the streams in the video file. The proposed steganographic system is implemented on the MP4 format. Although our method does not assume decoding of the video stream included in the MP4 file, its suitability depends on the used video encoder and more specially on the type of video scenes. A variable number of adjacent P and B frames in the individual GOPs (variable number of video frames in the MP4 chunk structures) is used to decode the inserted (hidden) information. Keywords— GOP, I-frame, MP4 file, P-frame, steganography, video stream