 This is also the primary source of most MPEG-1 video compression artifacts, like blockiness, color banding, noise, ringing, discoloration, et al.This happens when video is encoded with an insufficient bitrate, and the encoder is therefore forced to use high frame-level quantizers ("strong quantization") through much of the video.Several steps in the encoding of MPEG-1 video are lossless, meaning they will be reversed upon decoding, to produce exactly the same (original) values.