This paper presents two blind video watermarking techniques in the spatial and wavelet domain proposed by the authors and compares the two approaches. The original watermark and the original, unwatermarked videos are not required for the watermark extraction process. The two methods are combinations of spread-spectrum and quantization based techniques. The watermarks used are binary images, containing the copyright information. The watermark is protected against singular bit errors with a Hamming error correction code. The spatial domain technique embeds a watermark bit by spreading it in a luminance block. The actual embedding is done using a quantization based approach. The wavelet based technique embeds the same watermark bit into a number of chosen detail wavelet coefficients of the middle wavelet sub-band. The resilience of the schemes is improved by redundantly embedding the same watermark in a number of video frames. We have tested the perceptual quality of the watermarked videos and the resilience of our schemes to eight different attacks in the spatial, temporal and compressed domain, for different quantization step sizes and different number of redundant frames. The test results show that our wavelet domain technique achieves better video quality and robustness to attacks than the spatial domain method.