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FFmpeg not splitting videos precisely

I was trying to use FFmpeg to split videos into 30s segments, here is the full code:

from tkinter import filedialog, Tk
import subprocess
import os
Tk().withdraw()
path_to_video = filedialog.askopenfilename()
print(f"Path to video is: {path_to_video}")

segment_duration = input("Enter each segment duration in second: ")

os.chdir(os.path.dirname(__file__))
print(f"-i \"{path_to_video}\" -c copy -map 0 -segment_time {segment_duration} -f segment -reset_timestamps 1 Output_%03d.mp4")
subprocess.run([
    "E:\\Programs\\FFmpeg\\ffmpeg-master-latest-win64-gpl\\bin\\ffmpeg.exe", 
    "-i", path_to_video, 
    "-c:", "copy", 
    "-map", "0", 
    "-segment_time", segment_duration, 
    "-f", "segment", 
    "-reset_timestamps", "1",
    "Output_%03d.mp4"])

But it actually splits it into videos with really low precision, how can I fix it? Another post regarding this topic suggested adding this line:

"-force_key_frames", f"expr:gte(t,n_forced*{segment_duration})",

But it didn't really work...



source https://stackoverflow.com/questions/74551957/ffmpeg-not-splitting-videos-precisely
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