Trimmed video is wrong

[faisalwaris]

     videoTrimmer.setMaxDuration(3)
        videoTrimmer.maxFileSize = 440
        videoTrimmer.setVideoURI(Uri.parse(videoUrl))
        videoTrimmer.setOnTrimVideoListener(this)

when i trimmed the video and look into real device its showing 9 second rather than showing the actual trimmed video value. i tried it many times every time trimmed video is wrong. lets say if i select maximum duration to 3 second some time it trimmed it into 9 some time 19 second etc.