The robustness against geometrical attacks remains one of the most challenging issues in watermarking of images and video. This Paper presents several improvements of the video watermarking approach presented in [1], namely (i) using a temporally low-pass watermark and (ii) synchronization to resist attacks along the temporal axis. In order to improve the watermark detection performance. we propose: to rose to use an amplitude. limiting filter and a whitening filter during the watermark extraction process. Experimental results show that the proposed techniques achieve good performanee.