mkvdts2ac3 is a bash script which can be used for converting the DTS in
Matroska (MKV) files to AC3. It provides you with a healthy set of options
for controlling the resulting file.
Original is is by Jake Wharton but is modified here to work for my own use case specifically on Unraid.
Make sure the executables for the following libraries are accessible.
- mkvtoolnix docker - Matroska tools docker container (lesage/mkvtoolnix)
- ffmpeg - Audio conversion tool
- rsync - File transfer and synchronization
If you have git installed, you can just run
git clone git://github.com/tmchow/mkvdts2ac3.git.
You can download the script directly with wget or curl: wget https://raw.github.com/tmchow/mkvdts2ac3/master/mkvdts2ac3.sh -or- curl -O https://raw.github.com/tmchow/mkvdts2ac3/master/mkvdts2ac3.sh
Otherwise you can click the "Download" link on the GitHub project page and download an archive and extract its contents.
Edit each of the shell scripts mkvextract, mkvinfo and mkvmerge so the
right path mappings are included. The key to getting this to work on Unraid
using the docker container for MKVtoolnix is that we map paths exactly the
same as main unraid system (outside the docker) so the apps running within
the docker reference the files the same as you do outside the container.
Copy shell scripts mkvextract, mkvinfo and mkvmerge into /usr/bin.
These are scripts that wrap calls into the MKVToolNix container to avoid
needing to change the original mkvdts2ac3.sh script.
Optional: If you want easy access to the script from any directory you can copy
or symlink the mkvdts2ac3.sh file to a directory in your PATH variable or else
append the script's directory to the PATH variable.
This script was designed to be very simple and will automatically convert the first DTS track it finds in a Matroska file to AC3 and append it when run without any arguments. Since this was the most common scenario for the developer it is the default action. mkvdts2ac3.sh /path/to/file/Some.Random.Movie.mkv
IMPORTANT: This script only works with docker on unraid (my specific use case) if you pass in full paths
For users who wish to change the behavior there are a variety of options which
control various aspects of the script. Here is the output of the --help
argument.
mkvdts2ac3-1.5.3 - by Jake Wharton <[email protected]> and
Chris Hoekstra <[email protected]>
Usage: mkvdts2ac3.sh [options] <filename>
Options:
-c TITLE, Custom AC3 track title.
--custom TITLE
-d, --default Mark AC3 track as default.
-e, --external Leave AC3 track out of file. Does not modify the
original matroska file. This overrides '-n' and
'-d' arguments.
-f, --force Force processing when AC3 track is detected
-i, --initial New AC3 track will be first in the file.
-k, --keep-dts Keep external DTS track (implies '-n').
-m, --nocolor Do not use colors (monotone).
--md5 Perform MD5 comparison when copying across drives.
-n, --no-dts Do not retain the DTS track.
--new Do not copy over original. Create new adjacent file.
-p PRIORITY Modify niceness of executed commands.
-s MODE,
--compress MODE Apply header compression to streams (See mkvmerge's --compression).
-t TRACKID,
--track TRACKID Specify alternate DTS track.
-w FOLDER,
--wd FOLDER Specify alternate temporary working directory.
--test Print commands only, execute nothing.
--debug Print commands and pause before executing each.
-h, --help Print command usage.
-v, --verbose Turn on verbose output
-V, --version Print script version information.
If you find yourself constantly using the same settings, you can create a
configuration file to automatically set them. Copy the following to
~/.mkvdts2ac3.rc and uncomment whichever lines you wish.
#EXTERNAL=1
#NODTS=1
#KEEPDTS=1
#DEFAULT=1
#FORCE=1
#INITIAL=1
#NOCOLOR=1
#MD5=1
#NEW=1
#PRIORITY=0
#DTSTRACK=
#DTSNAME=
#COMP="none"
(Note: If EXTERNAL is set then NODTS and KEEPDTS should not be used.
AUDIOMODE is the -o-flag value passed to aften. PRIORITY is the
niceness value. DTSNAME is custom title for new AC3 track.)
Keep only the new AC3 track, discarding the original DTS
mkvdts2ac3.sh -n /dir/Some.Random.Movie.mkv
Specify an alternate directory to use for the temporary files. This can be
useful when the partition your /tmp directory on is tiny.
mkvdts2ac3.sh -w /mnt/bigHDD /dir/Some.Random.Movie.mkv
Convert a different DTS track rather than the first one sequentially in the
file. This will require you to check the output of a command like
mkvmerge -i Some.Random.Movie.mkv which will give you the track ids of each
file.
mkvdts2ac3.sh -t 4 /dir/Some.Random.Movie.mkv
If you want to retain the DTS track in an alternate location you can instruct the script not to delete it after the conversion.
mkvdts2ac3.sh -k /dir/Some.Random.Movie.mkv
If you want to keep the original file untouched (such as if you are still seeding it in a torrent) and your player supports external audio tracks you can choose to leave the converted AC3 track out of the file.
mkvdts2ac3.sh -e /dir/Some.Random.Movie.mkv
All of these examples only showcase the use of a single argument but they can be combined to achieve the desired result.
mkvdts2ac3.sh -d -t 3 -w /mnt/media/tmp/ /dir/Some.Random.Movie.mkv
If you're unsure of what any command will do run it with the --test argument
to display a list of command execute. You can also use the --debug argument
which will print out the commands and wait for the user to press the return key
before running each.
$ ./mkvdts2ac3.sh --test -d -t 3 -w /mnt/media/tmp /dir/Some.Random.Movie.mkv
mkvdts2ac3-1.5.3 - by Jake Wharton <[email protected]> and
Chris Hoekstra <[email protected]>
MKV FILE: Some.Random.Move.mkv
DTS FILE: /mnt/media/tmp/Some.Random.Movie.dts
AC3 FILE: /mnt/media/tmp/Some.Random.Movie.ac3
TIMECODE: /mnt/media/tmp/Some.Random.Movie.tc
NEW FILE: /mnt/media/tmp/Some.Random.Movie.new.mkv
WORKING DIRECTORY: /mnt/media/tmp
Checking to see if DTS track specified via arguments is valid.
> mkvmerge -i "/dir/Some.Random.Movie.mkv" | grep "Track ID 3: audio (A_DTS)"
Extract track information for selected DTS track.
> mkvinfo "/dir/Some.Random.Movie.mkv" | grep -A 25 "Track number: 3"
Extract language from track info.
> echo "INFO" | grep -m 1 "Language" | cut -d " " -f 5
Extract name for selected DTS track. Change DTS to AC3 and update bitrate if present.
> echo "INFO" | grep -m 1 "Name" | cut -d " " -f 5- | sed "s/DTS/AC3/" | awk '{gsub(/[0-9]+(\.[0-9]+)?(M|K)bps/,"448Kbps")}1'
Extract timecode information for the audio track.
> mkvextract timecodes_v2 "/dir/Some.Random.Movie.mkv" 3:"/mnt/media/tmp/Some.Random.Movie.tc"
> sed -n "2p" "/mnt/media/tmp/Some.Random.Movie.tc"
> rm -f "/mnt/media/tmp/Some.Random.Movie.tc"
Extract DTS file from MKV.
> mkvextract tracks "Some.Random.Movie.mkv" 3:"/mnt/media/tmp/Some.Random.Movie.dts"
Converting DTS to AC3.
> ffmpeg -i "/mnt/media/tmp/Some.Random.Movie.dts" -acodec ac3 -ac 6 -ab 448k "/mnt/media/tmp/Some.Random.Movie.ac3"
Running main remux.
> nice -n 0 mkvmerge -q -o "/mnt/media/tmp/Some.Random.Movie.new.mkv" --compression 1:none "/dir/Some.Random.Movie.mkv" --default-track 0 --language 0:DTSLANG --track-name 0:"DTSNAME" --sync 0:DELAY --compression 0:none "/mnt/media/tmp/Some.Random.Movie.ac3"
Removing temporary AC3 file.
> rm -f "/mnt/media/tmp/Some.Random.Movie.ac3"
Copying new file over the old one.
> cp "/mnt/media/tmp/Some.Random.Movie.new.mkv" "/dir/Some.Random.Movie.mkv"
Remove working file.
> rm -f "/mnt/media/tmp/Some.Random.Movie.new.mkv"
- Jake Wharton - [email protected]
- Chris Hoekstra - [email protected]
Git repository located at github.com/JakeWharton/mkvdts2ac3
Copyright 2018 Trevin Chow
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.