Thank You to try solve my problem, I trying to convert with suggested PocketDvxEnc. and now the sound better, but I have a quation....

Is it possible to refresh my player with a firmver with wich I can play MTV video files. If it is bigger than bigger. but when it has a better sound quality than lets do it... So could anyone advice me a firmware to refresh my MP4 digital player (Nano Clone - Lisong LSD-501-02 SDK: v. 3.5.37) to play other video format than AMV. For examp.: MTV, or MP4, or MPG, AVI, or other wich has a perfect sound quality in stereo.

I wait for the helpful answer! And I thank all of You to try to help me
Thank You very much!