1. A method for detecting white noise in a sequence of video frames, comprising: (a) calculating a noise estimate based on a sum of correlation values of motion vectors of adjacent macroblocks in a frame for a plurality of frames in the sequence of video frames; (b) comparing the noise estimate for each frame in the plurality of frames to a predefined threshold value; and (c) increasing a size of a quantization step in a quantizer device used to generate the sequence of video frames if the noise estimate for each frame in the plurality of frames is exceeded by the predefined threshold value.