MKVToolNix v99.0 “Buka” was released on May 24, 2026. Key changes across recent versions:
v99.0 “Buka” (2026-05-24)
- GUI now remembers the last-used directory for audio file selection separately from other open-file dialogs (notable on macOS)
- New command-line variables for post-job program execution:
MTX_DESTINATION_FILE_BASE_NAMEandMTX_DESTINATION_FILE_SUFFIX - “Execute now” test button now reflects current multiplexer tab values for MTX variables
- MTX_ variables are also exported as environment variables when running programs after job completion
- mkvmerge: legacy font MIME types from source files are now remapped to current types when legacy MIME type output is disabled
- Windows & macOS: MIME type detection now uses the FreeDesktop.org MIME database instead of file-extension guessing
v98.0 “Chonks” (2026-04-05)
- Japanese translations (program + man pages) significantly updated and completed
- Chapter Editor: option to apply modifications across all open tabs at once
- macOS: dock icon now shows job queue progress bar
- Bug fixes for chapter renumbering and macOS dark/light mode widget refresh
- Bundled fmt library updated to v12.1.0
v97.0 “You Don’t Have A Clue” (2026-01-02)
- mkvmerge MP4 reader: added TrueHD support in MP4 with FourCC
mlpa - Windows installer now requests admin permissions again