Flash player not playing not playing properly low bitrate sound

Hi,
I have created a flash audio player which can play streaming audio (mp3) files and it takes data from external xml file. Everthing is working fine. But when i used a low bitrate mp3 file (size 600 kb, time 3min approx) , it plays the audio with max speed and get ended in 30 seconds. The same audio file is playing normally in windows media player, or winamp,etc.
Plese give me some idea what is happening ........
Thanks,
Gunjan