On Oct 18, 2006, at 1:58 AM, Markus Meyer wrote:

I'm a developer of Audacity [1] and we use libmad to import MP2/MP3 files. While it generally works fine (thanks a bunch for the great library!) there are some MP2 files libmad does not import (see [2] for an example, about 4.4 MB). When trying to play this file with madplay 0.15.2 on Ubuntu, the following output is given:

markus@markus:~$ madplay nb00.mp2 MPEG Audio Decoder 0.15.2 (beta) - Copyright (C) 2000-2004 Robert Leslie et al. error: frame 0: bad bitrate/mode combination 0 frames decoded (0:00:00,0), -inf dB peak amplitude, 0 clipped samples

The file does play fine with mplayer, though.

Thanks for any response! Markus

[1] http://audacity.sourceforge.net/ [2] http://www.mesw.de/opensource/nb00.mp2

This file contains a 256 kbps single-channel Layer II stream. According to ISO/IEC 11172-3, "For Layer II, not all combinations of total bitrate and mode are allowed." The accompanying table shows that for 256 kbps Layer II streams, only stereo, intensity stereo, and dual channel modes are allowed.

This might, of course, be unnecessarily strict. I'll consider relaxing the restriction if I can determine no other potential adverse effects.

Thanks for the report,