本文件定义了SMPTE 291M辅助数据包的语法和语义 MPEG-2传输流PES数据包。它支持辅助数据包，无论它们是否 源于SD或HD接口，或者如果ANC数据包来自VANC或HANC、Y或C空间。 提供足够的信息以使解码器的输出处的ANC分组能够恢复到所述状态 它们在串行数字视频信号中的“原始”位置。

This document defines the syntax and semantics for the carriage of SMPTE 291M Ancillary Data Packets in MPEG-2 Transport Stream PES packets. It supports ancillary data packets regardless of whether they originate from an SD or HD interface, or if the ANC data packet is from VANC or HANC, Y or C space. Sufficient information is provided to enable the ANC packets at the output of the decoder to be restored to their "original" locations in the serial digital video signal.