tvOS externalMetadata displayed duration

Hi,


I am successfully using AVPlayerItem.externalMetadata to set custom data in the overlay displayed in the "Info" tab over the player during playback.

I can't seem to figure out how to change the displayed "duration" in the overlay

Whatever offest I am in the playback stream it shows "1hr 44 min" which is not the duration of the video or the position in the stream

If it is important I am also setting AVPlayer.navigationMarkerGroups they do not overlap and are seeking to the markers as expected.

Thank you for your time.

Claire