Anim files do not contain offset information. Therefore, for correct import of the resulting BVH into Avastar (offsets are not needed for SL), it is recommended to copy the offsets from your character in Blender. To obtain a donor BVH, export any animation of your character (it doesn't matter which one—even a static T-pose will work), ensuring that all bones are included. However, if you are using a standard avatar (or something close to it), you can select the "Use default offsets" option—this way, no additional steps will be required.
Feedback, feature requests, or suggestions for similar converters for other platforms are very welcome at anim2bvh@proton.me
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Feedback, feature requests, or suggestions for similar converters for other platforms are very welcome at anim2bvh@proton.me