It's not dead!
https://github.com/dubhater/D2VWitch/releases/tag/v3
Among other things, this release brings audio delay calculation, automatic indexing of vts_xx_y.vob sequences (in the command line), various bug fixes. The full list:
changes.rst.
No H264 support because there are some problems to sort out. (Although no one has complained of any in a long time, so I assume it's mostly fine.) LSmash
appears to work fine, anyway.