cuts.txt

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left_right 00:00:53 00:00:58
left_up 00:00:58 00:01:01

slice.py

import subprocess
#define video_path before use
with open("cuts.txt") as f:
  for idx, line in enumerate(f.readlines()):
    filename, start, end = line.strip().split(' ')
    cmd = ["ffmpeg", "-i", f"{video_path}", "-ss", start, "-to", end, f"{idx}_{filename}.MOV"]
    subprocess.run(cmd, stderr=subprocess.STDOUT)