Hi, I noticed that MPlayer prints some messages even after adding "-really-quiet". C:\>mplayer foo.ac3 -af volume=3 -channels 6 -really-quiet -loop 0 Using SSE optimized IMDCT transform Using MMX optimized resampler liba52/resample.c and liba52/imdc.c is using fprintf(stderr, "..."); Was it intentional? Adding "2>null" makes it quiet again.