@Override
    public String toString() {
        return this.value;
    }
If the WebVTT captions track is intended to provide accessibility for people who are deaf or hard of hearing: Set
Accessibility subtitles to Enabled. When you do, MediaConvert adds accessibility attributes to your output HLS or
DASH manifest. For HLS manifests, MediaConvert adds the following accessibility attributes under EXT-X-MEDIA for this
track: CHARACTERISTICS="public.accessibility.describes-spoken-dialog,public.accessibility.describes-music-and-sound"
and AUTOSELECT="YES". For DASH manifests, MediaConvert adds the following in the adaptation set for this track:
<Accessibility schemeIdUri="urn:mpeg:dash:role:2011" value="caption"/>. If the captions track is not intended to
provide such accessibility: Keep the default value, Disabled. When you do, for DASH manifests, MediaConvert instead
adds the following in the adaptation set for this track: <Role schemeIDUri="urn:mpeg:dash:role:2011"
value="subtitle"/>.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/WebvttAccessibilitySubs.java