Semi-fragile video watermarking is an important technology of videos’ content authentication. A novel semi-fragile watermarking scheme is proposed in this paper in order to improve authentication abilities. The scheme obtained the watermarking information by adopting double-feature extraction which was a combination of DCT blocks’ relation and grayscale blocks’ relation. The watermark was embedded into the host video with an improved DEW algorithm after it had been Turbo coded. The double-feature extraction algorithm can conquer single-feature’s imperfection to improve the abilities of tamper estimation and orientation. Turbo code can improve the robustness of watermark and decrease the probability of false positive. Experimental results demonstrate that it will not degrade the visual quality of original videos

and it can authenticate normal tamper operations. Besides the scheme have little probability of false positive.