getSubtitleUrl  
  fun getSubtitleUrl(routeItemId: <Error class: unknown class>, routeMediaSourceId: String, routeIndex: Int, routeFormat: String, endPositionTicks: Long? = null, copyTimestamps: Boolean? = false, addVttTimeMap: Boolean? = false, startPositionTicks: Long? = 0): String
Gets subtitles in a specified format.
Parameters
routeItemId  
The (route) item id.
routeMediaSourceId   
The (route) media source id.
routeIndex 
The (route) subtitle stream index.
routeFormat 
The (route) format of the returned subtitle.
endPositionTicks  
Optional. The end position of the subtitle in ticks.
copyTimestamps 
Optional. Whether to copy the timestamps.
addVttTimeMap   
Optional. Whether to add a VTT time map.
startPositionTicks  
The start position of the subtitle in ticks.