I will answer your "questions" by giving the corresponding parts from configure.log. The file has 3195 lines so it makes no sense to include it in the body of this message. >First, obviously this of course should not result in bad output, unless >your PC is too slow to play the MP3 in that case (which I can't imagine). ============ Checking for CPU vendor ============ Result is: AuthenticAMD (15:67:2) ########################################## ============ Checking for CPU type ============ Result is: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+ ########################################## >Secondly, since it works fine on x86_64 Linux, please check configure.log, >and give us the _full_ MPlayer output. I can privately send you the file for the reason explained above. >I suspect that SSE was detected as not available by MPlayer, in which case >you have more problems than just broken MP3 playback (all 64 bit systems >are required to have SSE support). No this is not true: ########################################## ============ Checking for kernel support of sse ============ #include <stdlib.h> #include <signal.h> void catch() { exit(1); } int main(void) { signal(SIGILL, catch); __asm__ volatile ("xorps %%xmm0, %%xmm0":::"memory"); return 0; } gcc-4.3.2 -m64 -O3 -pipe -I/opt/gnu/include -I/usr/sfw/include -I/usr/X11/include -I/usr/X11/include/NVIDIA -fomit-frame-pointer -I. -o /tmp/mplayer-conf-7341-26764 /tmp/mplayer-conf-18554-26764.c Result is: yes ########################################## ============ Checking for kernel support of sse2 ============ #include <stdlib.h> #include <signal.h> void catch() { exit(1); } int main(void) { signal(SIGILL, catch); __asm__ volatile ("xorpd %%xmm0, %%xmm0":::"memory"); return 0; } gcc-4.3.2 -m64 -O3 -pipe -I/opt/gnu/include -I/usr/sfw/include -I/usr/X11/include -I/usr/X11/include/NVIDIA -fomit-frame-pointer -I. -o /tmp/mplayer-conf-7341-26764 /tmp/mplayer-conf-18554-26764.c Result is: yes ########################################## >The 3DNow routines are not available on x86_64 though. OK I have figured this out. >Apart from that, the "obvious" solution is to compile with --disable-mp3lib This is not a real solution, but if everything else will fail it is a reasonable solution. Reagrds, A. Syropoulos