本标准规定了VC-3编码单元作为可用于MXF GC图片项目的图片元素的映射。图片元素可以包含使用帧包装的单个VC-3压缩帧，或者使用剪辑包装的VC-3压缩帧序列。SMPTE 379-1中描述了MXF通用容器（GC）。VC-3编码单元和压缩帧在SMPTE 2019-1中描述。本标准规定了VC-3图片元素的键、长度和值字段。本标准还定义了Essence容器和压缩标签值以及Essence描述符。

This standard specifies the mapping of VC-3 Coding Units as a Picture Element that may be used in the Picture Item of the MXF GC. The Picture Element may contain either individual VC-3 Compressed Frames using frame-wrapping or a sequence of VC-3 Compressed Frames using clip-wrapping. The MXF Generic Container (GC) is described in SMPTE 379-1. VC-3 Coding Units and Compressed Frames are described in SMPTE 2019-1.This standard specifies the Key, the Length and the Value fields of the VC-3 Picture Element.This standard also defines the Essence Container and Compression Label values and the Essence Descriptor.