Closed captioning 608 unknown trackname

Hey Guys,

I am using roVideoPlayer for my closed captioning.
Is there a way to get the list of tracknames available on an HLS stream? Basically I have an HLS stream (608 enabled) and not sure what the CC trackname is.

SubtitleConfig  : { TrackName   : "eia608/English"}

Whatever I give, it always returns this error:

*** ERROR: Missing or invalid PHY: 'eia608/<trackName>'

Or knowing the CC trackname upfront (while initializing the videoplayer) is the only way to get CC to work?

--
Sonny