getTotalDuration and getTotalPcmDuration both return 0

[LeiYangGH]

Hi, I can run this demo in linux.
but adding 2 lines didn't get expected result:
System.out.println("getTotalPcmDuration " + tool.getTotalPcmDuration()); System.out.println("getTotalDuration " + tool.getTotalDuration());

Could you suggest any fix?