I could not reproduce your issue with the latest CVS code build which I have. Buffer size is same 65536 as before. MPlayer dev-CVS-040524-13:06-3.3.3 (C) 2000-2004 MPlayer Team ./mplayer -frames 10 -ao alsa mysample.mov alsa: 16000 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit Little Endian good luck