HC is a simple to use MPEG2 video encoder and is meant for creating MPEG2 video streams with a strong focus on DVD-compliancy.
The official change log for version 0.21 is as follows:
- added SSSE3 support
- added some new functions: *LUMGAIN, *SILENT and *SCDFILE
- higher encoding speed for best profile
- as usual some bug fixes
You may download this updated version here