This collection of codecs will allow you to play Ogg Vorbis, Speex, Theora and FLAC in Windows Media Player or any other directshow application. Included along with the decoder filters are also encoders for all the above formats. Vorbis is a general purpose audio codec that rivals mp3 Speex is a specialised speech codec Theora is a general purpose video codec FLAC is a lossless audio codec