Cache not filling error when using mplayer to read from stdin

I have a program that's generating audio and I can't get mplayer to play it. I'm doing ./myprogram | mplayer - -cache 1024 -cache-min 30 -noconsolecontrols And I get the message Cache fill: X% (Y bytes) X goes up to the specified cache-min value (but not past it) and then it keeps printing the error message: Cache not filling, consider increasing -cache and/or -cache-min! I tried some other values for cache and cache-min but none of them worked. Of course, there is a possibility that my program is somehow at fault.