In this research work, an efficient robust video steganography in compressed domain is presented based on discrete cosine transform (DCT) encoded with H.264 codec. In this method, a compressed video (.mp4) of different resolutions, frame rates and sizes are used as a cover and RGB image is used as a secret message. Using appropriate stego key, the secret frames from the sequence of video frames are selected and the non-dynamic pixels of these frames are identified. The least significant bits (LSB) of the DCT component of these non-dynamic pixels are used as carrier object for hiding the R, G, and B components of secret message individually. An appropriate embedding key is designed to embed secret message in cover video such that the quality assessment parameters viz. Peak signal-to-noise ratio (PSNR) and mean square error (MSE) of imperceptibility can be optimized. Also, the successful extraction of secret message from the cover stego video is assessed by the robustness parameters viz. Bit error rate (BER) and similarity (Sim). The hiding capacity of proposed video steganography with respect to secret message and cover frame is measured by using hiding ratio (HR). The efficiency of proposed video steganography method is compared with the reported methodologies on the basis of the parameters of imperceptibility and robustness.

在这项研究工作中，基于H.264编解码器编码的离散余弦变换（DCT），提出了在压缩域中有效的鲁棒视频隐写技术。在这种方法中，将不同分辨率，帧速率和大小的压缩视频（.mp4）用作封面，并将RGB图像用作秘密消息。使用适当的隐秘密钥，从视频帧序列中选择秘密帧，并识别这些帧的非动态像素。这些非动态像素的DCT分量的最低有效位（LSB）用作载体对象，用于分别隐藏秘密消息的R，G和B分量。适当的嵌入密钥被设计为在秘密视频中嵌入秘密消息，从而使质量评估参数为viz。可以优化不易察觉的峰值信噪比（PSNR）和均方误差（MSE）。同样，通过健壮性参数viz评估了从掩护秘密视频中成功提取秘密消息。误码率（BER）和相似度（Sim）。通过使用隐藏率（HR）来测量建议的视频隐秘术相对于秘密消息和封面的隐藏能力。基于隐身性和鲁棒性的参数，将所提出的视频隐写方法的效率与所报道的方法进行了比较。通过使用隐藏率（HR）来测量建议的视频隐秘术相对于秘密消息和封面的隐藏能力。基于隐身性和鲁棒性的参数，将所提出的视频隐写方法的效率与所报道的方法进行了比较。通过使用隐藏率（HR）来测量建议的视频隐秘术相对于秘密消息和封面的隐藏能力。基于隐身性和鲁棒性的参数，将所提出的视频隐写方法的效率与所报道的方法进行了比较。