srt_sub_extarct.py

'''Extract srt subtitles from mkv videos with mkvextract, and name srts with mkv names.

cmd: mkvextract src_video_path tracks track_id:dst_srt_path [track_id_1:dst_srt_path_1 ...]

see more about mkvextarct at https://mkvtoolnix.download/doc/mkvextract.html
'''

import os


# setting
video_dir = '.\Modern.Family'  # replace with your video dir pls
track_id = 2  # replace with your specific track_id, default: video=0, audio=1, text(subtitle)=2.


# collact all mkv video paths
src_video_paths = []
for root, dirs, files in os.walk(video_dir):
    for file in files:
        if file.endswith('mkv'):
            src_video_paths.append(os.path.join(root, file))

# extract srt subtitles via mkvextract
for src_video_path in src_video_paths:
    dst_srt_path = src_video_path.replace('.mkv', '.srt')
    os.system('mkvextract {} tracks {}:{}\n'.format(src_video_path, track_id, dst_srt_path))