Jaudio tagger library returns the track length as worng

I use JAudiotagger library to get the track length of an audio file f.ge开发者_JAVA百科tAudioHeader().getTrackLength() I use this it returns 3.34 as length but the actual length is 5.34.

Am I wrong anywhere?

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Its looks at the Xing/VRBI frame header rather than each audio frame itself whihc would be much slower to calculate