Crop Video using ffmpeg

crop_video.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Crop Video in multiple places using ffmpeg

* Input file: a text file containing several lines.
Each line should contain `start_time` and `end_time` of the interval (hh:mm:ss.ms)
e.g.
    00:00:05.0    00:00:27.18
    00:02:07.18   00:03:14.1
    00:03:29.93    00:08:24.89

* Video file: input video file
* Output file: name for the output file

The output of the script is `ffmpeg` command string, which can be copied and executed.
Alternatively the output can be piped directly to bash,
`python crop_video.py times_demo.txt demo_raw.mp4 demo.mp4 | bash`

@author: Hrishikesh Terdalkar
"""

import sys
import datetime

input_file = sys.argv[1]
video_file = sys.argv[2]
output_file = sys.argv[3]

with open(input_file) as f:
    times = [
        line.split('#')[0].split()
        for line in f.read().split('\n')
        if line.split('#')[0].strip()
    ]

seconds = []

for start_time, end_time in times:
    sh, sm, ss = start_time.split(':')
    eh, em, es = end_time.split(':')
    seconds.append([
        datetime.timedelta(hours=int(sh), minutes=int(sm), seconds=float(ss)).total_seconds(),
        datetime.timedelta(hours=int(eh), minutes=int(em), seconds=float(es)).total_seconds()
    ])


time_str = '+'.join([f'between(t,{s:.1f},{e:.1f})' for s, e in seconds])
command = (f'''ffmpeg -i {video_file} '''
           f''' -vf "select='{time_str}', setpts=N/FRAME_RATE/TB"'''
           f''' -af "aselect='{time_str}', asetpts=N/SR/TB"'''
           f' {output_file}')
print(command)