Closed captioning sample description
An atom that defines how to interpret closed captioning media data.
Overview
The closed captioning sample description contains information that defines how to interpret closed captioning media data. This sample description is based on the standard sample description header, as described in Sample description atom ('stsd'), and adds no additional fields.
The data format field in the sample description must be set to 'c608' or 'c708'. A closed caption track must use only one data format.