mkvmerge, MKVToolNix GUI’s multiplexer: the handling of the “default track” flag has been changed to match the recent changes to the Matroska specifications.Here are the NEWS since the previous release: New features and enhancements The other Linux binaries are stil being built and will be available over the course of the next couple of hours.

The Windows and macOS binaries as well as the Linux AppImage are available already. You can download the source code or one of the binaries. Last, but not least: get vaccinated if at all possible, y’all! There were a couple of changes for packages, though none of them should actually require work on recent distros. See the news below for details on both changes.

Another prominent change is which MIME types are used for attached fonts on Windows. The most noticeable change (to end users at least) is how the “default track” flag is handled, bringing it up to how the latest spec says the flag should be handled by players. Unlike the previous releases a lot more time has gone into it. And once you add the deb repository to your sources list, you will be able to install the command line tools and/or the GUI tool as well.Summer is here, and so is MKVToolNix v58.0.0. If you check their download page, you will find Ubuntu deb repositories. There's also the mkvalidator as mentioned by the other answers, but I couldn't find recent builds for Linux. There's the MKVToolNix, mentioned in the official Matroska website, which is a package of tools, one of them is mkinfo which can be used to retrieve some information about Matroska and WebM files.

Mkvtoolnix gui set track uid