Open MKVToolNix and drag your video file and subtitle file into the "Source files" section. Check the boxes for the tracks you want to keep.
If you have a separate subtitle file (like an .srt ) for this release, you can use several methods to combine them: subtitle Nix.2022.WEBRip.x264-ION10Nix.2022.WEB...
: For temporary viewing without changing the file, rename your subtitle file to match the video file exactly (e.g., Nix.2022.WEBRip.x264-ION10.srt ) and place it in the same folder. VLC will automatically detect and load it. Open MKVToolNix and drag your video file and
: x264 (H.264/AVC), which is highly compatible with most smart TVs, consoles, and players. VLC will automatically detect and load it
: This is the industry standard for MKV files. It "remuxes" the file to include the subtitle track without re-encoding the video, meaning there is no loss in quality .
Click "Start multiplexing" to create a new MKV file with the subtitles embedded.