Selected release notes from upstream ChangeLog (since 9.6.0):
Deprecation warning: Several options and features are now deprecated and will be removed at the start of 2018. These are: - mkvmerge: the options "--identify-verbose", "--identify-for-gui", "--identify-for-mmg" and "--identification-format verbose". Please convert existing users of these interfaces to use mkvmerge's JSON identification output which can be invoked with "--identification-format json --identify …". - all command line tools: the old, proprietary format used for option files. Please convert users of this interface to the new JSON option file format introduced in this release.
all command line tools: the option "--check-for-updates" (the GUI will keep its online check for updates, though). There is and will be no equivalent interface in the tools themselves. Users of this interface can switch to retrieving the information about available updates directly from the MKVToolNix website. The information is available as JSON and XML files at the following URLs: https://mkvtoolnix.download/latest-release.json.gz https://mkvtoolnix.download/latest-release.xml.gz
New features and enhancements
mkvmerge: VobSub in Matroska: mkvmerge will now create and use a default index for VobSub tracks read from Matroska files that are missing their CodecPrivate element (which normally contains said index). Implements #1854.
GUI: added checks for several common problems with the installation. These checks will be executed when the GUI starts, and any problems will be reported to the user.
mkvmerge: added the ISO 639-2 language codes "qaa" and "qad" (both are titled "reserved for local use") as both are used often in France. See #1848 for more information.
mkvmerge: the JSON identification result now includes a track's codec delay if set (only for Matroska source files). The JSON schema version has been bumped to 6.
mkvmerge: MPEG TS: added a workaround for files where the subtitle packets are multiplexed properly, but where their timestamps are way off from the audio and video timestamps. Implements #1841.
mkvmerge: added support for Digital Video Broadcasting (DVB) subtitles (CodecID S_DVBSUB). They can be read from MPEG transport streams and from Matroska files. Implements #1843.
mkvmerge: enhancement: added a new track property in JSON/verbose identification mode called "multiplexed_tracks". It's an array of track IDs that describe which of the tracks mkvmerge reports as separate ones were originally part of the same source track (e.g. TrueHD+AC-3 in a single track in MPEG transport streams). Implements #1835.
mkvmerge: added support for skipping APE(v2) tags in TTA files.
mkvextract: enhancement: added support for reporting progress in --gui-mode the same way mkvmerge does.
all: new feature: all command line tools can now read JSON-formatted option files. Such a file's name must have an extension of ".json" (e.g. "mkvmerge @options.json"). Its content must be a valid JSON array consisting solely of JSON strings.
MKVToolNix GUI: header editor & job output enhancement: added menu entries for saving or closing all open tabs.
MKVToolNix GUI: chapter editor enhancement: added menu entries for saving or closing all open tabs.
mkvmerge: MPEG TS/MPLS reader improvements: added support for subtitle tracks that are referenced from the MPLS file as sub-paths in other M2TS files than the main tracks.
MKVToolNix GUI: multiplexer enhancement: the file identification process has been re-written to be properly multi-threaded. This allows the user to continue working with the GUI while e.g. playlists from a Blu-ray are identified.
mkvmerge: enhancement: mkvmerge can now handle Blu-ray playlists from the "BACKUP" sub-directory of a Blu-ray disc.
MKVToolNix GUI: new multiplexer feature: added a menu entry for copying the title to the destination file name. It will replace the destination file's base name but keep its path & extension.
MKVToolNix GUI: new multiplexer feature: all positive file identification results will now be cached between runs. This speeds up adding the same file a lot, especially when scanning the same Blu-ray playlists again. Cached results are invalidated automatically with newer MKVToolNix releases or when the source file changes.
MKVToolNix GUI: multiplexer enhancement: when the user tries to add one of the main Blu-ray index files (index.bdmv, MovieObject.bdmv) the GUI will automatically scan the Blu-ray playlist files and offer them for selection.
MKVToolNix GUI: multiplexer enhancement: tracks, chapters, tags, attachments not selected for multiplexing will be displayed the same way as other disabled controls. Implements #1819.
mkvmerge: MP4 reader: when an MP4 file contained fewer entries for timestamps than frames (which they never should), mkvmerge would use 0 as the timestamp for all the other frames. This resulted in effects such as the last frame of an output file having a timestamp of 0 and in split files having a much longer duration than they should have. Fixes #1847.
GUI: the cache cleanup process that's run automatically when the GUI starts no longer blocks file identification until it is finished. Additionally the process will only be run once per release of MKVToolNix. Fixes #1860.
GUI: certain failures during file identification that can be traced to broken installations (e.g. mkvmerge being too old) won't be stored in the cache anymore. Without this fix the GUI would still use the cached failed identification result even though the underlying might have already been fixed.
mkvmerge: fixed that the error message "not enough space on disk" was shown twice on some operating systems. Fixes #1850.
mkvmerge, Matroska: if a codec delay is set for a track in the input file, it is kept. Fixes #1849.
GUI: multiplexer: changing default values in the preferences (e.g. the default track language to set) did not affect files whose identification results had already been cached.
mkvmerge, MP4: fixed detection of MP3 audio when the object type ID in the ESDS signals MP2 and the track headers have invalid values for number of channels or sampling frequency. Fixes #1844.
MKVToolNix GUI: multiplex tool bug fix: under certain circumstances the GUI was creating invalid JSON files when starting to multiplex resulting in an error message ("JSON option files must contain a JSON array consisting solely of JSON strings").
mkvmerge: bug fix: when using --track-order without specifying all tracks, the track numbers could end up in a way the user did not expect. Now mkvmerge will always assign track numbers for those tracks that are listed in --track-order first. The other tracks are assigned numbers afterwards. Fixes the second part of #1832.
mkvmerge: bug fix: when reading Matroska files the movie title was always taken from the first Matroska source file, even if that file didn't have a title set. Fixes one part of #1832.
MKVToolNix GUI: re-worked the startup code not to use lock files when trying to open a socket for communicating with an already-running instance. This aims to prevent situations with stale lock files not being cleaned up and the GUI not starting anymore as a result. This might fix or prevent issues like #1805.
mkvmerge: teletext subtitle bug fix: fixed the handling of DVB teletext subtitles signaled with data unit ID 0x02 and that contain pages from multiple magazines.
mkvmerge: bug fix: files smaller than 4 bytes were wrongly identified as MPEG transport streams.
mkvmerge: bug fix: the MPEG transport stream reader was using an outdated format for the "CodecPrivate" element for HDMV TextST subtitles. This has been updated to the current format which only contains the "dialog style element". Existing Matroska files using this outdated scheme can be fixed by running them through mkvmerge v9.6.0 itself or any later release as the old format is automatically converted to the new one when it is read from Matroska files.
GUI: the update check now uses Qt's networking classes instead of CURL.
The command line option "--check-for-updates" has been removed, even
though the deprecation warning in release 9.7.0 stated that it would
be removed in 2018.