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由于可变字长码（ ＶＬＣ） 在视频信号的高度压缩中会产生负面影响，因此全面分析了视频码流的结构和ＤＣ、ＡＣ 系数码字的单比特错误及可能给图像质量造成的影响， 这对于采取必要的手段来提高图像的质量有着十分重要的意义。
Due to the negative impact of variable-length code (VLC) on the high-level compression of video signals, the structure of the video stream and the single-bit errors of the DC coefficient and AC-coefficient code words, as well as the possible influence on the image quality, This is of great significance for taking the necessary measures to improve the quality of the image.