batch extract subtitles from mkv files

mkvextractTracks.sh

#!/bin/bash -e

# a script that extracts the subtitle file of every mkv movie file and saves it with the same name
# copy to the folder where the mkv files live and run "./mkvextractTracks.sh" in terminal
# options: [trackID]
# example: ./mkvextractTracks.sh 1
#
# info:
# mkvextract is used to extract the subtitles, so mkvtoolnix app (which contains the mkvextract binary) is used:
# https://mkvtoolnix.download/downloads.html
# please adjust below path to point to mkvextract or this script won't work

extractorPath='/Applications/MKVToolNix-9.0.1.app/Contents/MacOS/mkvextract'
defaultTrackID=2
# Ensure we're running in location of script.
cd "`dirname $0`"

if [ $# -gt 0 ]
then
	defaultTrackID=$1
fi

for f in *; do
  if [[ $f == *.mkv ]];
    then
        echo $f
        $extractorPath tracks "$f" $defaultTrackID:"${f//mkv/srt}"
  fi
done

echo "Complete"

Use this instead, it's way better. It loops through all tracks and extracts every subtitle to its correct format, with language included in the filename:
https://github.com/Bananaman/BananaScripts/blob/main/mkvextract-allsubs

How to use this?

Install Python on your system, if you don't have it.

Install MKVToolNix and add it to your PATH environment so that the commands can be found (guide for that here).

Then save the script itself and run it with Python (or make the script file executable and run it directly). Some usage examples are in the code comments.

If there are any other questions, please make a ticket at the project page so that others can also see your question. :)

I mean I save it as mkvextract-allsubs.py. Then I run python mkvextract-allsubs.py? It is not working. Could you please share full command?

@anhthoai The reason why I said to make tickets at the project page is because I cannot see your replies here.

Anyway, the script was written with Linux and Mac in mind, but today I added Windows support. You can find the latest script at the project page:

https://github.com/Bananaman/BananaScripts/blob/main/mkvextract-allsubs

I'm guessing you were using Windows, which is why it didn't work before.

Just head to that project page, read the source code. The comments at the top of the file explain what you need on every platform.

It's working on Linux, Windows and Mac.

If you or anybody else have any other questions, you must post them on the linked BananaScripts project page.

Important: I will never check this gist page/comments here again. I will not see any comments below this one. Use the project page if you have questions about the project! Take care. :)

@Bananaman Oh thanks. your script is very usefull.

@anhthoai install python 3.5 and mkvtoolnix then windows command: python mkvextract-allsubs file.mkv

# Requires:
#   Python >= 3.5
#   MKVToolNix:
#   - Linux: Install "mkvtoolnix" via your native package manager.
#   - Mac: Install Homebrew use it to install the following package:
#     https://formulae.brew.sh/formula/mkvtoolnix
#   - Windows: Install Chocolatey and use it to install the following package:
#     https://community.chocolatey.org/packages/mkvtoolnix
#     (IMPORTANT: You MUST reboot Windows for the changes to take effect!)
#
# Usage:
#   mkvextract-allsubs [one or more MKV files to extract from]

@Bananaman is it possible to directly shell script on Linux without Python, please?

Came here for a potential one-liner but was sadly disappointed that this was just a way to extract subtitles from a single file.

Bananaman's script was borked for some reason, so no love there too.

In the end, the solution using pure Bash was not that hard.

Here's a one-liner:

for F in *.mkv; do MKV=$(echo $F | sed -e "s/\.mkv$//"); SUBS=$(mkvmerge -i "$MKV.mkv" | grep "SubRip/SRT" | cut -d ' ' -f3 | tr -d ':'); for SUB in $SUBS; do mkvextract tracks "$F" $SUB:"${MKV}_$SUB.srt"; done; done

Or if you prefer a more elegant solution in the form of a script you just execute in a folder:
https://gist.github.com/fevangelou/48da813ac1d5d0d207ff0acab1c09df2

Enjoy :)

Very usefull. Thank you @fevangelou ;)