本标准规定了SMPTE 327M中定义的SDTV的MPEG-2视频记录数据集的数据缩减方法。如ISO/IEC 13818-2所述，编码信息在图片解码过程中从符合ISO/IEC 13818的MPEG比特流中导出。这种数据简化的MPEG-2重新编码数据集可以通过其他SMPTE标准中定义的各种方式进行传输（更多细节见附件）。

This standard specifies a data reduction method for the MPEG-2 video recoding data set for SDTV as defined in SMPTE 327M. The coding information is as derived from an ISO/IEC 13818 compliant MPEG bit stream during the picture decoding process, as described in ISO/IEC 13818-2. This data-reduced MPEG-2 recoding data set may be transported by various means defined in other SMPTE standards (see annex for further details).