Analyzing C3D Files with Python

This notebook illustrates the process of opening and analyzing motion capture data stored in C3D file format using the Python c3d library. It demonstrates how to read frames from a C3D file and print the point coordinates for each frame, offering a hands-on example for researchers or developers working with biomechanical motion data.

snippet.python

import c3d

snippet.python

with open('Theodora_Afraid-C3D.c3d', 'rb') as handle:
    reader = c3d.Reader(handle)
    for i, (points, analog) in enumerate(reader.read_frames()):
        print('Frame {}: {}'.format(i, points.round(2)))

//anaconda/envs/general/lib/python3.6/site-packages/c3d.py:564: UserWarning: missing parameter ANALOG:LABELS
  warnings.warn('missing parameter {}'.format(name))
//anaconda/envs/general/lib/python3.6/site-packages/c3d.py:564: UserWarning: missing parameter ANALOG:DESCRIPTIONS
  warnings.warn('missing parameter {}'.format(name))



---------------------------------------------------------------------------

ValueError                                Traceback (most recent call last)

<ipython-input-2-544754b532f4> in <module>()
      1 with open('Theodora_Afraid-C3D.c3d', 'rb') as handle:
      2     reader = c3d.Reader(handle)
----> 3     for i, (points, analog) in enumerate(reader.read_frames()):
      4         print('Frame {}: {}'.format(i, points.round(2)))


ValueError: too many values to unpack (expected 2)

python