• You can also merge multiple subtitle files with an MKV video file. How to merge subtitles with an MKV video using MKVToolNix. MKVToolNix is a set of free tools to create, split, edit, mux, demux, merge, extract, and inspect MKV video files. It's available for Microsoft Windows, Linux, and macOS.
• About MKVToolNix. MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. Since May 1st 2003, the Matroska libraries themselves and my Matroska tools are officially available. I urge you to download the software, use it and report any errors you encounter to me.

GUIs and batch operations

• gMKVExtractGUI: a GUI for mkvextract supporting its full range of features. Runs on Windows and Linux.
• MKVcleaver: MKVcleaver is a tool for batch extraction of data from MKV files. It is similar to mkvextractGUI in functionality, but allows loading of many files. There's also a forum post on doom9 about it.
• JMkvpropedit: a batch GUI for mkvpropedit written in Java
• bulk-mkv-muxer: a multi-threaded tool for batch-muxing of files into Matroska files
• MKVmergeBatcher: Windows GUI application for batch muxing with mkvmerge.exe
• MkTags: a simple Perl application that lets you edit the tags in a Matroska file. It can be used with WebM files as well, since this format is based on a profile of Matroska. It supports most of what’s in the official tag specifications.

Ripping DVDs/BluRays into Matroska

• iso2mkv: a versatile convertor from DVD to XviD/vorbis MKV on top of MPlayer/MEncoder
• OGMRip: an application and a set of libraries for ripping and encoding DVD into AVI, OGM or Matroska files using a wide variety of codecs. It relies on mplayer, mencoder, ogmtools, oggenc and lame to perform its tasks. The GUI features a clean HIG-compliant GNOME 2 interface and tries to minimize as much as possible esoteric settings.
• Tuxrip: a Linux bash script for ripping and encoding DVD titles in mpeg4 format (DivX, XviD, FFmpeg libavcodec). It features per title or full DVD ripping, audio extraction and encoding, support for multi-audio tracks, 2-pass video compression for a given file size and quality, compressibility testing for optimal quality and resolution determination, support for codec options, audio/video synchronization, CD burning, and automatic computer shutdown.

Converting Matroska files into other files

MKVToolnix is a video conversion and edition application for Matroska video files, yes MKV format. MKV is more and more used day by day, but some media players don't support it, specially portable media players, so it's time to convert it and MKVToolbox will help you.

• mkvdts2ac3: 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.

So apparently there's a method to backup UHD ISO's into MP4's that triggers Dolby Vision on an LG or Vizio television app via USB. I made this thread in the hopes we can figure out a way to reconvert this into MKV. The procecure is the following -
1. Make ISO of movie. I have only tested this with Black Panther since that's the only one I own. I will be buying Gladiator this weekend to test out though.
2. Use TS Muxer to open the ISO. Find the correct M2TS file and demux the following files:
A. HEVC1 in 4K (Base layer)

Mp4 Toolnix

B. HEVC 2 in 1080p (this is the dolby vision enhancement layer)
C. Audio track which you will have to convert to AC3. This is a hard line limitation- you need to use AC3!!!
3. Once you have HEVC1, HEVC2, and the Audio track. Run Dolby Vision MP4Muxer (https://github.com/DolbyLaboratories/dlb_mp4base)

Mkvtoolnix Change Mkv To Mp4

DolbyVision MP4 Muxer only works in Command Prompt so you have to navigate to the corresponding folders where the files are and type
mp4muxer --dv-profile 7 --input-file (baselayername.hevc1) --input-file (dvlayername.hevc2) --input-file (audio.ac3) --media-lang eng --output-file (nameofmovie).mp4

Mkvtoolnix Windows

*Right now we are limited to only MP4 and AC3 audio. Hoping we figure out an MKV solution.

Mkv To Mp4 Converter online, free

Mkvtoolnix Convert Mkv To Mp4

It sounds like its complicated, but it isn't. The entire process took me an hour to figure out, but once I did it, I sold my Xbox One X, because I'm now using my LG USB to play Dolby Vision MP4's! Hopefully this starts a discussion.