Settings for accessibility captions
When you create an HLS or CMAF HLS output and include an ISMC or WebVTT captions track, you
can add accessibility attributes for captions to your output manifest.
MediaConvert adds these attributes according to sections 4.5 and 4.6 of the
HLS authoring specification for Apple devices
When you set Accessibility subtitles
(accessibility) to Enabled
(ENABLED), MediaConvert adds the following attributes to the
captions track in the manifest under EXT-X-MEDIA:
CHARACTERISTICS="public.accessibility.describes-spoken-dialog,public.accessibility.describes-music-and-sound"
and AUTOSELECT="YES".
Keep the default value, Disabled (DISABLED),
if the captions track is not intended to provide such accessibility.
MediaConvert will not add the attributes from the previous paragraph.
