Fix FOV distortion in VRChat camera, inspired from https://gist.github.com/chigirits/55d6eed4396ed5da64878af2b43111ed

fix-fov.py

import argparse
import functools
import glob
import itertools
import multiprocessing as mp
import os
import os.path
import subprocess
import sys


def convert_mapper(args, infile):
    k = float(args.fov) / 60.0
    k2 = (k - k**3) / 6.0
    k4 = k

    base, ext = os.path.splitext(infile)
    outfile = base + f".fov{args.fov}" + ext
    if os.path.exists(outfile):
        print(f"File {outfile} already exists, skipping", file=sys.stderr)
        return None

    cmdline = [args.convert, infile, "-distort",
               "barrel", f"0 {k2} 0 {k4}", outfile]
    print(cmdline)
    subprocess.run(cmdline)
    return True


def main():
    parser = argparse.ArgumentParser()

    parser.add_argument('--fov', '-f', help='target FOV', type=int, default=50)
    parser.add_argument('--fov-from', '-F',
                        help='convert from FOV', type=int, default=60)
    parser.add_argument('--convert', '-c',
                        help='path to convert(1)', default="convert")
    parser.add_argument('files', type=str, nargs='+', help='files to process')
    parser.add_argument('--jobs', '-j', help='num of concurrent convert(1)s',
                        type=int, default=os.cpu_count())
    args = parser.parse_args()

    with mp.Pool(processes=args.jobs) as pool:
        list(pool.imap_unordered(functools.partial(convert_mapper, args),
                                 itertools.chain.from_iterable(
            [glob.iglob(f) for f in args.files]),
        ))


if __name__ == '__main__':
    mp.freeze_support()
    main()