ffmpeg_clip.py

import os
import argparse
import datetime as dt
import subprocess as sp

def main(inn, bb, ee):
    fn, ext = os.path.splitext(inn)

    def parse_time(s):
        try:
            t = dt.datetime.strptime(s, '%H:%M:%S')
        except:
            t = dt.datetime.strptime(s, '%M:%S')
        return t

    def count_seconds(t):
        return t.hour * 60 * 60 + t.minute * 60 + t.second

    bb = parse_time(bb)
    ee = parse_time(ee)
    bs = count_seconds(bb)
    es = count_seconds(ee)
    dd = ee - bb

    sp.call([
        'ffmpeg',
        '-ss', args.begin,
        '-t', f'{dd.total_seconds()}',
        '-i', inn,
        '-vcodec', 'copy',
        '-acodec', 'copy',
        '-avoid_negative_ts', 'make_zero',
        f'{fn}_{bs}-{es}{ext}'
    ])

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('input', help='Input file name')
    parser.add_argument('begin', help='Begin of time')
    parser.add_argument('end', help='End of time')
    args = parser.parse_args()

    main(args.input, args.begin, args.end)