javafx - Java MediaPlayer totalduration unknown -

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I have a short question I am creating an audio player, but I have a small problem when I Use: Duration Period = this.mediaplayer.getTotalDuration (); The period will become unknown, then I have tested, media media player is not zero. Does anyone know how can I fix this problem? Thankyou very much.

you mediaPlayer.getCurrentTime ()

getTotalDuration 

  receives total playback period including all chakras (repetition).

getCurrentTime 

  retrieves the current media time

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