本推荐做法定义了VC-2视频压缩规范的约束条件，以提供夹层级压缩编码。它定义了编码约束，使得使用每秒50、60和60/1.001帧的4:2:2采样的1920 x 1080像素的源视频可以被压缩大约2.5到1的系数，从而产生一个压缩比特率，该压缩比特率允许在以1.5 Gb/s运行的单链路SDI上传输。本文档定义了根据该实践压缩的视频的VC-2比特流。它还为VC-2压缩定义了特定于应用程序的级别。

This recommended practice defines constraints on the VC-2 video compression specification to provide a mezzanine level compression coding. It defines coding constraints such that source video of 1920 x 1080 pixels using 4:2:2 sampling at 50, 60 and 60/1.001 frames per second can be compressed by a factor of approximately 2.5 to 1 resulting in a compressed bit-rate that permits carriage over a single-link SDI operating at 1.5 Gb/s.This document defines a VC-2 bit-stream for video compressed according to this practice. It also defines an application specific level for VC-2 compression.