b8
- block_align fix in 6ch mode. see :
http://forum.doom9.org/showthread.php?p=609216#post609216

b7
- workaround for converting open-bitrate dtswavs..

b6
- fast calculation of crc for ac3 streams
- support for 48khz,16bit,stereo PCM files.
- -core( -demux ) switch now works on mp2 files, in addition to existing wave support.