MKVToolNix is ​​a set of powerful tools for making and processing mkv (Matroska) format, which supports packaging multiple video, audio, subtitle and other formats into mkv format.

MKVToolNix 72.0 is officially released, the updates are as follows:

New Features and Improvements

• mkvmerge: AV1 parser: variable OBU size field will be rewritten with minimum length if encoding is longer than necessary
• MKVToolNix GUI: Multiplexer: When dragging and dropping directories to the “Attachments” tab, files in those directories will be attached
• MKVToolNix GUI: Info tool: Added file information (directory, size, modification timestamp) at the top of each tab

bug fixes

• mkvmerge: AV1 parser: Fixed parser aborting completely when parsing OBU size field due to not enough data to parse
• mkvmerge: HDMV PGS subtitles: reverted change implementing heuristics to detect spurious timestamps and try to fix them.
• mkvmerge: Matroska reader: Fixed reading files with EBML Void elements before Matroska Segment elements.
• mkvpropedit, the chapter and title editor for the MKVToolNix GUI: updated the list of deprecated Matroska elements, the application will no longer attempt to write to these elements even if they are found in the file to be modified.
• mkvpropedit, chapter and title editor for MKVToolNix GUI: When the Matroska version number stored in the EBML Head element was updated, the updated EBML Head element might be smaller than the existing one.
• mkvpropedit, chapter and title editor for the MKVToolNix GUI: the program often needs to reposition modified Master elements.
• MKVToolNix GUI: Title Editor: Fixed pixelated icons on higher aspect ratio values
• …

More details can be found at: https://www.bunkus.org/blog/2022/11/mkvtoolnix-v72-0-released/