diff -p -up acoustid-fingerprinter-0.6/decoder.h.ffmpeg acoustid-fingerprinter-0.6/decoder.h
--- acoustid-fingerprinter-0.6/decoder.h.ffmpeg	2013-04-11 21:55:12.243036748 +0200
+++ acoustid-fingerprinter-0.6/decoder.h	2013-04-11 21:55:57.425964011 +0200
@@ -186,6 +186,8 @@ inline bool Decoder::Open()
 		m_error = "Unknown codec.";
 		return false;
 	}
+	/* request regular signed 16-bit packed format */
+	m_codec_ctx->request_sample_fmt = AV_SAMPLE_FMT_S16;
 
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(53, 8, 0)
     if (avcodec_open(m_codec_ctx, codec) < 0) {