Batch convert Collada to Wavefront (.dae to .obj) using Blender

dae_obj.py

"""
Batch convert Collada to Wavefront (.dae to .obj) using Blender
usage: blender -b -P dae_obj.py -- ./in_dir/ ./out_dir/
"""
import sys
import os
import bpy # Blender Python API

def clear():
    """ Clears the scene """
    bpy.ops.object.select_all(action='SELECT')
    bpy.ops.object.delete()

def usage():
    sys.stderr.write(__doc__)

def convert(fdae, fobj):
    """ Converts individual .dae file to .obj """
    bpy.ops.wm.collada_import(filepath=fdae)
    bpy.ops.export_scene.obj(filepath=fobj)

def main(argv=[]):
    args = []
    if '--' in argv:
        args = argv[(argv.index('--')+1):]

    if len(args) < 2:
        usage()
        return 1

    ddae = args[0]
    dobj = args[1]
    # Select only .dae files in the input directory
    fdaes = [os.path.join(ddae, f) for f in os.listdir(ddae)]
    fdaes = list(filter(lambda x: x.endswith('.dae'), fdaes))
    # Create the output directory if necessary
    os.makedirs(dobj, exist_ok=True)
    # Convert every file keeping the base name
    for fdae in fdaes:
        clear()
        modelname = os.path.basename(fdae).rstrip('.dae')
        fobj = os.path.join(dobj, modelname + '.obj')
        convert(fdae, fobj)

if __name__ == '__main__':
    main(sys.argv)