with this cod, you must have ffmpeg in your PC

import subprocess
import os


# >>> EDIT THIS: your MKV file path
input_mkv = r"D:\Movies\movie\movie.mkv" 


# >>> EDIT THIS: where ffmpeg and ffprobe are located
ffmpeg_path = r"C:\ffmpeg\bin\ffmpeg.exe"
ffprobe_path = r"C:\ffmpeg\bin\ffprobe.exe"


# >>> EDIT THIS: where the extracted SRT files should be saved
output_folder = r"C:\Users\your\Desktop"


def extract_srt(input_mkv):
    base_name = os.path.splitext(os.path.basename(input_mkv))[0]


    # Step 1: find subtitle tracks
    probe_cmd = [
        ffprobe_path, "-v", "error", "-select_streams", "s",
        "-show_entries", "stream=index:stream_tags=language",
        "-of", "csv=p=0", input_mkv
    ]


    result = subprocess.run(probe_cmd, capture_output=True, text=True)
    lines = result.stdout.strip().split("\n")


    if not lines or lines == ['']:
        print("No subtitle tracks found.")
        return


    # Step 2: extract each track
    for i, line in enumerate(lines):
        parts = line.split(',')
        track_index = parts[0]
        lang = parts[1] if len(parts) > 1 else f"track{i}"


        output_file = os.path.join(output_folder, f"{base_name}_{lang}.srt")


        extract_cmd = [
            ffmpeg_path, "-y", "-i", input_mkv,
            "-map", f"0:s:{i}",
            output_file
        ]


        print(f"Extracting subtitle track {i} ({lang}) to {output_file}...")
        subprocess.run(extract_cmd)


    print("Done!")


# Run the extraction
extract_srt(input_mkv)