A video steganography scheme based on H.264 bitstreams replaced

Analyze H.264 standard´s excellent, an information hiding scheme compatible with H.264 baseline is proposed. The scheme takes into account the features of Context Adaptive Variable Length Coding (CAVLC) which is used in H.264 baseline entropy coding. By modifying trailing ones sign flag and levels´ words in CAVLC, embedding information can be achieved. This scheme directly operates on the 4×4 residual data blocks. New codeword replacing original one make the embedding algorithm has a greater capacity and does not increase the rate. Meanwhile, the scheme modifies the high-frequency coefficients, which has good invisibility.