[MPlayer-dev-eng] audio seems faster than video

[boku]

Dear all,
    I'm trying to add a new video decoder into MPlayer-1.0rc2.
When I tested some MPEG2 movie it seems some av sync problem.
The video part can be finished displaying on time. But the audio
seems a little faster. I use windows media player to play as
a reference. What might this AV sync problem be?
Or does mplayer have some options for me to lengthen audio play time?

Thx~
Best Regards,