Mplayerosx

Hi, I just discovered this wonderful player some days ago.
I had troubles to play smoothly the 1080p video on my MacBook pro, but thanks to Mplayer now they play smoothly : thank you very much for your work.

But unfortunately I had issue with the movie with the sound encoded in flac.
I tried with others players : VLC and NicePlayer played the sound normally (but the video lags...)
I tried Plex and I had the same trouble I have with Mplayer : the sound is... low.

I play japanese animation so with subtitles, and I can read the subtitles with low voices.
Some sounds are playing normally, but tiny sounds disapears... and the voices too...
I have this issue only with flac encoded files...

I tried to play flac files alone : works great.

So I don't know what to do, I check on the net and the preferences pane... I didn't succeed to have the sound play normally.

Thanks for your help.