救命啊!WinAVI MP4 Converter 轉成mp4檔後,無聲音.

請問各位好心人:
本人將.mpg檔利用WinAVI MP4 Converter 轉成mp4檔後,無聲音.
本人使用dopod 900 + tcpmp 播放後出現
錯誤:
播放器:mpeg4 AAC AUDIO DECODER NOT INCLUDERD!IT
WAS REMOVED FROM THE OFFICIAL INSTALL PACKAGE
BECAUSE OF INTELLECTUAL PROPERTY CONSIDERATIONS.
請問應如何解決?感恩啦.