Converting BVH animations to VMD animations can be a bit complicated, and you will need some patience and perseverance to succeed with it. There are several issues which can give you problems in making this conversion. Here is the information which I have about these problems and how to solve them, followed by step-by-step instructions for converting BVH to VMD:
LIST OF POSSIBLE ISSUES AND THEIR SOLUTIONS:
1. The Blender BVH importer has a bug. If you try to import a BVH file which has Japanese bone names, it won't import into Blender, and you will get an error message. This simple bug fix will work if your BVH file is a unicode utf-8 text