Here is a 100k part of an MP3 that has a high-pitched chirp artifact when decoded with ffmp3 but plays fine with mp3lib: http://www1.mplayerhq.hu/~diego/say_say.mp3 The chirp occurs during the first second. To reproduce it, play the sample with 'mplayer -ac ffmp3' or ffplay and with 'mplayer -ac mp3' and compare. Diego