MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some.
* build system: For the time being the build system will always
build and link statically against the internal versions of libEBML
* mkvmerge: bug fix: Fixed appending timecode calculation for
appended subtitle tracks if the subtitle tracks are read from
complex containers (e.g. Matroska, MP4, AVI etc). Fix for bug 620.
Product page: here