bvh-python

Python module for parsing BVH (Biovision hierarchical data) mocap files

Reading bvh file

from bvh import Bvh
mocap = Bvh.from_file("tests/test_freebvh.bvh")

Trimming

new_mocap = bvh[100:1000]  # trim from 100ms to 1000ms

Exporting

new_mocap.export("new.bvh")

Get mocap tree

[str(item) for item in mocap.root]
# ['HIERARCHY', 'ROOT mixamorig:Hips', 'MOTION', 'Frames: 69', 'Frame Time: 0.0333333']

Get ROOT OFFSET

next(mocap.root.filter('ROOT'))['OFFSET']
# ['0.0000', '0.0000', '0.0000']

Get JOINT OFFSET

mocap.joint_offset('mixamorig:Head')
# (-0.0, 10.3218, 3.1424)

Get Frames

mocap.nframes
# 69

Get Frame Time

mocap.frame_time
# 0.0333333

Get JOINT CHANNELS

mocap.joint_channels('mixamorig:Neck')
# ['Zrotation', 'Yrotation', 'Xrotation']

Get Frame CHANNEL

mocap.frame_joint_channel(22, 'mixamorig:Spine', 'Xrotation')
# 11.8096

Get all JOINT names

mocap.get_joints_names()
# ['mixamorig:Hips', 'mixamorig:Spine', 'mixamorig:Spine1', 'mixamorig:Spine2', 'mixamorig:Neck', 'mixamorig:Head', 'mixamorig:HeadTop_End', 'mixamorig:LeftEye', 'mixamorig:RightEye', 'mixamorig:LeftShoulder', 'mixamorig:LeftArm', 'mixamorig:LeftForeArm', 'mixamorig:LeftHand', 'mixamorig:LeftHandMiddle1', 'mixamorig:LeftHandMiddle2', 'mixamorig:LeftHandMiddle3', 'mixamorig:LeftHandThumb1', 'mixamorig:LeftHandThumb2', 'mixamorig:LeftHandThumb3', 'mixamorig:LeftHandIndex1', 'mixamorig:LeftHandIndex2', 'mixamorig:LeftHandIndex3', 'mixamorig:LeftHandRing1', 'mixamorig:LeftHandRing2', 'mixamorig:LeftHandRing3', 'mixamorig:LeftHandPinky1', 'mixamorig:LeftHandPinky2', 'mixamorig:LeftHandPinky3', 'mixamorig:RightShoulder', 'mixamorig:RightArm', 'mixamorig:RightForeArm', 'mixamorig:RightHand', 'mixamorig:RightHandMiddle1', 'mixamorig:RightHandMiddle2', 'mixamorig:RightHandMiddle3', 'mixamorig:RightHandThumb1', 'mixamorig:RightHandThumb2', 'mixamorig:RightHandThumb3', 'mixamorig:RightHandIndex1', 'mixamorig:RightHandIndex2', 'mixamorig:RightHandIndex3', 'mixamorig:RightHandRing1', 'mixamorig:RightHandRing2', 'mixamorig:RightHandRing3', 'mixamorig:RightHandPinky1', 'mixamorig:RightHandPinky2', 'mixamorig:RightHandPinky3', 'mixamorig:RightUpLeg', 'mixamorig:RightLeg', 'mixamorig:RightFoot', 'mixamorig:RightToeBase', 'mixamorig:LeftUpLeg', 'mixamorig:LeftLeg', 'mixamorig:LeftFoot', 'mixamorig:LeftToeBase']

Get single JOINT name

mocap.get_joints_names()[17]
# 'mixamorig:LeftHandThumb2'

Get JOINT parent index

mocap.joint_parent_index('mixamorig:Neck')
# 3

Get JOINT parent name

mocap.joint_parent('mixamorig:Head').name
# 'mixamorig:Neck'

Search single item

[str(node) for node in mocap.search('JOINT', 'LeftShoulder')]
# ['JOINT LeftShoulder']

Search all items

[str(node) for node in mocap.search('JOINT')]
# ['JOINT mixamorig:Spine', 'JOINT mixamorig:Spine1', 'JOINT mixamorig:Spine2', 'JOINT mixamorig:Neck', 'JOINT mixamorig:Head', 'JOINT mixamorig:HeadTop_End', 'JOINT mixamorig:LeftEye', 'JOINT mixamorig:RightEye', 'JOINT mixamorig:LeftShoulder', 'JOINT mixamorig:LeftArm', 'JOINT mixamorig:LeftForeArm', 'JOINT mixamorig:LeftHand', 'JOINT mixamorig:LeftHandMiddle1', 'JOINT mixamorig:LeftHandMiddle2', 'JOINT mixamorig:LeftHandMiddle3', 'JOINT mixamorig:LeftHandThumb1', 'JOINT mixamorig:LeftHandThumb2', 'JOINT mixamorig:LeftHandThumb3', 'JOINT mixamorig:LeftHandIndex1', 'JOINT mixamorig:LeftHandIndex2', 'JOINT mixamorig:LeftHandIndex3', 'JOINT mixamorig:LeftHandRing1', 'JOINT mixamorig:LeftHandRing2', 'JOINT mixamorig:LeftHandRing3', 'JOINT mixamorig:LeftHandPinky1', 'JOINT mixamorig:LeftHandPinky2', 'JOINT mixamorig:LeftHandPinky3', 'JOINT mixamorig:RightShoulder', 'JOINT mixamorig:RightArm', 'JOINT mixamorig:RightForeArm', 'JOINT mixamorig:RightHand', 'JOINT mixamorig:RightHandMiddle1', 'JOINT mixamorig:RightHandMiddle2', 'JOINT mixamorig:RightHandMiddle3', 'JOINT mixamorig:RightHandThumb1', 'JOINT mixamorig:RightHandThumb2', 'JOINT mixamorig:RightHandThumb3', 'JOINT mixamorig:RightHandIndex1', 'JOINT mixamorig:RightHandIndex2', 'JOINT mixamorig:RightHandIndex3', 'JOINT mixamorig:RightHandRing1', 'JOINT mixamorig:RightHandRing2', 'JOINT mixamorig:RightHandRing3', 'JOINT mixamorig:RightHandPinky1', 'JOINT mixamorig:RightHandPinky2', 'JOINT mixamorig:RightHandPinky3', 'JOINT mixamorig:RightUpLeg', 'JOINT mixamorig:RightLeg', 'JOINT mixamorig:RightFoot', 'JOINT mixamorig:RightToeBase', 'JOINT mixamorig:LeftUpLeg', 'JOINT mixamorig:LeftLeg', 'JOINT mixamorig:LeftFoot', 'JOINT mixamorig:LeftToeBase']

Get joint's direct children

mocap.joint_direct_children('mixamorig:Hips')
# [JOINT mixamorig:Spine, JOINT mixamorig:RightUpLeg, JOINT mixamorig:LeftUpLeg]