Data Hiding in Encoded Video Sequences based on H.264

Different data hiding methods would be required in different operating environments. To improve the quality of videos embedded by data, this paper will apply the differences of matching blocks in the H.264 encoder during the inter prediction stage and enforce the size of the matching blocks to implement data hiding. Bit rate increases after being embedded by data, to resolve the problem, this paper will mainly make use of the method of modifying the trailing coefficients sign-bit of fixed-length coding to control the bit rate in Context Adaptive Variable Length Coding (CA VLC). To equipoise the quality and bit rate of videos, this paper proposes an algorithm that embeds data separately in both of these two coding blocks.