A Docker Mod for the LinuxServer.io Radarr/Sonarr Docker container that adds a script to automatically strip out unwanted audio and subtitle streams, keeping only the desired languages. Chapters, if they exist, are preserved. The Title attribute in the MKV is set to the movie title plus year (ex: The Sting (1973)) or the series title plus episode information (ex: Happy! 01x01 - What Smiles Are For).

One unified script works in both Radarr and Sonarr. Use this mod in either container!

NOTE: This mod support Linux OSes only.

Container info:

Installation

NOTE: See the Sonarr/Radarr v3 Builds section below for important differences to these instructions for v3 builds.

Pull your selected container (linuxserver/radarr or linuxserver/sonarr) from Docker Hub:
docker pull linuxserver/radarr:latest OR
docker pull linuxserver/sonarr:latest
Configure the Docker container with all the port, volume, and environment settings from the original container documentation here:
linuxserver/radarr
linuxserver/sonarr
1. Add the DOCKER_MODS environment variable to the docker create command, as follows:
  -e DOCKER_MODS=linuxserver/mods:radarr-striptracks
  
  Example Synology Configuration
2. Start the container.
After all of the above configuration is complete, to use mkvmerge:
1. Configure a custom script from the Radarr/Sonnar Settings->Connect screen and type the following in the Path field:
  /usr/local/bin/striptracks.sh
2. Add the codes for the audio and subtitle languages you want to keep as Arguments (details in the Syntax section below): Suggested Example
  :eng:und :eng

Usage

NOTE: See the Sonarr/Radarr v3 Builds section below for important differences to these instructions for v3 builds.

The source video can be any mkvtoolnix supported video format. The output is an MKV file with the same name.

If you've configured the Radarr/Sonarr Recycle Bin path correctly, the original video will be moved there.
NOTE: If you have not configured the Recycle Bin, the original video file will be deleted/overwritten and permanently lost.

Syntax

The script accepts two arguments and one option in the Arguments field:

[-d] <audio_languages> <subtitle_languages>

The arguments are language codes in ISO639-2 format. These are three letter abbreviations prefixed with a colon ':', such as:

:eng
:fre
:spa

...etc.

Multiple codes may be concatenated, such as :eng:spa for both English and Spanish.

It is suggested to use :eng:und :eng if you are unsure of what to choose. This will keep English and Undetermined audio and English subtitles, if they exist.

NOTE: The script is smart enough to not remove the last audio track. This way you don't have to specify every possible language if you are importing a foreign film, for example.

The -d option enables debug logging.

Examples

:eng:und :eng              # keep English and Undetermined audio and English subtitles
-d :eng ""                 # Enable debugging, keeping English audio and no subtitles
:eng:kor:jpn :eng:spa      # Keep English, Korean, and Japanese audio, and English and 
                             Spanish subtitles

Triggers

The only events/notification triggers that have been tested are On Download and On Upgrade

Logs

A log file is created for the script activity called:

/config/logs/striptracks.txt

This log can be inspected or downloaded from the Radarr/Sonarr GUI under System->Logs->Files

Script errors will show up in both the script log and the native Radarr/Sonarr log.

Log rotation is performed with 5 log files of 512KB each being kept.

NOTE: If debug logging is enabled, the log file can grow very large very quickly. Do not leave debug logging enabled permanently.

Sonarr/Radarr v3 Builds

Warning: Unstable Releases
The Sonarr/Radarr v3 Builds are the unstable releases (Aphrodite and Phantom) of Radarr and Sonarr. Though the mod works with all versions of the container, I cannot guarantee these releases are stable.

Important differences for Sonarr/Radarr v3 Builds

Mod installation

Substitute the following steps for those noted in the Installation section above.

Pull your selected container (linuxserver/radarr or linuxserver/sonarr) from Docker Hub:
docker pull linuxserver/radarr:preview OR
docker pull linuxserver/sonarr:preview
Configure the Docker container with all the port, volume, and environment settings from the original container documentation here:
linuxserver/radarr
linuxserver/sonarr
1. Add the DOCKER_MODS environment variable to the docker create command, as follows:
  -e DOCKER_MODS=linuxserver/mods:radarr-striptracks
  
  Example Synology Configuration
2. Start the container.
After the above configuration is complete, to use mkvmerge, configure a custom script from the Settings->Connect screen and type the following in the Path field:

/usr/local/bin/striptracks-eng.sh

This is a wrapper script that calls striptracks.sh with the following arguments, which keep English audio and subtitles only!
:eng:und :eng

For any other combinations of audio and subtitles you must either use one of the included wrapper scripts or create a custom script with the codes for the languages you want to keep. See the Syntax section above. Do not put striptracks.sh in the Path field!

Included Wrapper Scripts

NOTE: The Arguments field for Custom Scripts was removed in Radarr and Sonarr v3 due to security concerns. To support options with this version and later, a wrapper script can be manually created that will call striptracks.sh with the required arguments.

For your convenience, several wrapper scripts are included in the /usr/local/bin/ directory.
You may use any of these scripts in place of the striptracks-eng.sh mentioned in the Mod installation section above.

striptracks-dut.sh         # Keep Dutch audio and subtitles
striptracks-eng.sh         # Keep English and Undetermined audio and English subtitles
striptracks-eng-debug.sh   # Keep English and Undetermined audio and English subtitles, and enable debug logging
striptracks-eng-jpn.sh     # Keep English, Japanese, and Undetermined audio and English subtitles
striptracks-fre.sh         # Keep French audio and subtitles
striptracks-fre-debug.sh   # Keep French audio and subtitles, and enable debug logging
striptracks-ger.sh         # Keep German audio and subtitles
striptracks-spa.sh         # Keep Spanish audio and subtitles

Example Wrapper Script

To configure the last entry from the Examples section above, create and save a file called wrapper.sh to /usr/local/bin containing the following text:

#!/bin/bash

. /usr/local/bin/striptracks.sh :eng:kor:jpn :eng:spa

Then put /usr/local/bin/wrapper.sh in the Path field in place of /usr/local/bin/striptracks-eng.sh mentioned in the Mod installation section above.

Preview Triggers

The only events/notification triggers that have been tested are On Import and On Upgrade

Preview Logs

The log can be inspected or downloaded from the Radarr/Sonarr GUI under System->Log Files

Credits

This would not be possible without the following:

Radarr
Sonarr
LinuxServer.io Radarr container
LinuxServer.io Sonarr container
LinuxServer.io Docker Mods project
MKVToolNix by Moritz Bunkus
The AWK script parsing mkvmerge output is adapted from Endoro's post on VideoHelp.