Python script to convert and speed up any video to a 14.9s video for use in Instagram stories

insta_story.py

import sys
import subprocess
import re


if len(sys.argv) < 3:
    print("Needs input & output arguments!")
    exit()

in_path: str = sys.argv[1]
out_path: str = sys.argv[2]

process = subprocess.run(["ffmpeg", "-i", in_path], stderr=subprocess.PIPE)

lines = process.stderr.decode("utf-8").split("\n")
for line in lines:
    match = re.search(r'Duration: (\d\d):(\d\d):(\d\d.\d\d)', line)
    if match:
        duration_s: float = float(match.group(1)) * 60 * 60 + float(match.group(2)) * 60 + float(match.group(3))
        break
else:
    print("Couldn't get video duration!")
    exit()

speed_factor: float = 14.9 / duration_s

# From: https://ubuntuforums.org/showthread.php?t=2339470
subprocess.run([
    "ffmpeg",
    "-i", in_path,
    "-c:v", "libx264",
    "-filter:v", "setpts=PTS*{:.3f}".format(speed_factor),
    "-r", "30",
    "-an",
    out_path])