I have acquired a set of early recordings that won't play and won't convert. Windows Media Player 11 says that the .mp3 file extension doesn't match the file format. Using various tag editors, I find the info is: Mode MPEG-2.5, Bitrate 0, Frequency 11025. Steve Butcher
These seem to be 11.025kHz MPEG-2.5 Layer III files, encoded in a low-quality format developed by Fraunhofer IIS. This is not part of the MPEG standard so most MP3 players probably won't play them. I think your best bet is to try one of the players that uses the open source MAD (MPEG Audio Decoder) code, which says it supports MPEG-2.5. There's a list at http://www.underbit.com/products/mad/. I'd start with Audacity and/or CoolPlayer (http://coolplayer.sourceforge.net/) for Windows.
