{ track : Basics.Int
, tracks : List Jawa.CaptionTrack.CaptionTrack
}
https://docs.jwplayer.com/players/reference/captions-events#oncaptionschanged
decoder : Json.Decode.Decoder CaptionsChanged
A JSON decoder.
encode : CaptionsChanged -> Json.Encode.Value
A JSON encoder.
tag : String
The tag that describes this type.