FAQ: 杜比视界元数据的级别（简明版）

Dolby Vision metadata is created by the colorist during the color correction/grading process. The metadata that is created can be exported from the color correction system as an XML. There are two versions of Dolby Vision namely, CMv2.9 and CMv4.0.

Dolby Vision is a set of technologies developed by Dolby Laboratories for high-dynamic-range (HDR) video. [1][2][3] It covers content creation, distribution, and playback. [1][4][5][6] It includes dynamic metadata that define the aspect ratio and adjust t

dovi_meta is a CLI tool for creating Dolby Vision XML metadata from an encoded deliverable with binary metadata.

Dolby Vision metadata is created by the colorist during the color correction/grading process. The metadata that is created can be exported from the color correction system as an XML. There are two versions of Dolby Vision namely, CMv2.9 and CMv4.0.

通常，杜比视界元数据是在调色环节中生产制作出来的，并且可以导出为xml表单形式。 元数据会伴随着杜比视界内容整个生命周期，贯穿于制作、编码、传输和回放等环节中。 目前为止，杜比视界元数据发展了两个版本：2.9和4.0。 在4.0中，映射算法和映射曲线都做了改进，且支持更多的人工微调，因此映射效果更佳。 相应的，2.9 xml文件和4.0 xml文件也是两个不同的版本，分别为2.0.5和4.0.2. 杜比视界元数据被分成了不同的级别（Level），每个级别里面的元数据承担不同的功能。 下面是对不同级别元数据

This article discusses the basics of Dolby Vision meta-data and the parameters that the user needs to validate before the content is delivered.