incorrect 5.1 channel order handling in oggenc/oggdec
Oggenc appears not to remap 5.1 channel order from WAV order (L/R/C/LFE/BL/BR) to Vorbis order defined by xiph's specifications :
six channels : the stream is 5.1 surround. channel order: front left, front center, front right, rear left, rear right, LFE
Tested with rarewares build 2005-07-10.
The same problem applies to oggdec (again assumes WAV channel order on libvorbis output, so it actually decodes incorrect oggenc output back to correct WAV).