This is quoted from Cambo/ideasman42, the author of Blender's BVH handling, :

"Hi, Blender 2.41 is able to import, edit bvhs and export them, but only as a hierarchy of empties.

I wasnt happy with only supporting empties so I removed the scripts for 2.42 and they also needed re-writing.

Recently I rewrote the BVH importer.
which should work with 2.42.

But the exporter has not been written so far.
expect to get to it in the coming months.

This was in August, he and others are working on restoring the export functionality.

Tenzin

Forum: Blender

Subject: BIG, BIG FAVOR.