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BVH (BioVision Hierarchy) motion capture file parser for DuckDB

Installing and Loading

INSTALL bvh2sql FROM community;
LOAD bvh2sql;

Example

-- Load the extension
LOAD bvh2sql;

-- Read BVH file and get absolute joint positions
SELECT frame_id, time, joint_name, world_x, world_y, world_z
FROM bvh_absolute_positions('motion.bvh')
WHERE joint_name = 'Hips'
LIMIT 10;

-- Analyze joint movement over time
SELECT 
  joint_name,
  AVG(world_y) as avg_height,
  MAX(world_y) - MIN(world_y) as height_range
FROM bvh_absolute_positions('motion.bvh')
GROUP BY joint_name
ORDER BY avg_height DESC;

About bvh2sql

The BVH2SQL extension allows you to read BioVision Hierarchy (BVH) motion capture files directly into DuckDB for analysis and processing.

Features:

• Parse BVH hierarchy structure with joint offsets
• Calculate absolute world positions for all joints using matrix transformations
• Support for position channels (Xposition, Yposition, Zposition)
• Support for rotation channels (Xrotation, Yrotation, Zrotation)
• Efficient frame-by-frame processing
• Returns data as a standard SQL table with columns: frame_id, time, joint_name, world_x, world_y, world_z, rot_x, rot_y, rot_z

Use Cases:

• Motion capture data analysis
• Animation retargeting preparation
• Character movement statistics
• Biomechanics research
• Game development data pipeline

Added Functions

Overloaded Functions

This extension does not add any function overloads.

Added Types

This extension does not add any types.

Added Settings

This extension does not add any settings.