Version 21.0.0 "Tardigrades Will Inherit The Earth" 2018-02-24

New features and enhancements

• mkvmerge: track statistics tags: the TagDefault element will not be written anymore as it was always set to the default value 1 anyway. Implements #2202.
• mkvmerge, MKVToolNix GUI: JSON files can now contain C++-style line comments outside of strings (e.g. something like this: // this is ignored). Such comments, even though not part of the official JSON specifications, are now ignored when reading JSON files.
• MKVToolNix GUI: chapter editor: opening a Matroska file without chapters in it will now open the file in an empty chapter editor instead of showing an error message. Implements #2218.
• MKVToolNix GUI: an "info" tool has been added, replacing the functionality of mkvinfo's GUI. The functionality is not on par yet but will be for release v22. Implements most of the functionality of #2104.

Bug fixes

• mkvmerge: appending files with additional parts at the same time was broken if more than one additional part was appended (e.g. when appending files from DVDs with something like '(' VTS_01_1.VOB VTS_01_2.VOB ')' + '(' VTS_02_1.VOB VTS_02_2.VOB ')'). In such a situation the content from files VTS_02_1.VOB and VTS_02_2.VOB where laid out in parallel to the content from the earlier files.
• mkvmerge: FLV reader: a single invalid AAC frame was written for AAC audio tracks with codec initialization data longer than five bytes.
• mkvmerge: FLV reader: timestamps will be normalized down to 0. Fixes #2220.
• mkvmerge: MP4 reader: if an AAC track doesn't contain an AAC-specific decoder configuration in the ESDS portion, then a default decoder configuration will be generated based on the track's header data instead of skipping the track. Fixes #2221.
• mkvmerge: MP4 reader: fixed reading HEVC/h.265 video tracks if they're stored as Annex B byte streams inside MP4. Fixes #2215.
• mkvmerge: Ogg Opus reader: mkvmerge will now emit a warning instead of aborting when it encounters an Ogg Opus page with no data in the packet. Fixes #2217.
• mkvmerge, mkvextract: Matroska parser: fixed a segmentation fault that occurred whenever the first level 1 element after resyncing after an error in the file structure isn't a cluster. Fixes #2211.
• mkvmerge, MKVToolNix GUI multiplexer & header editor: fixed a crash during file type detection for attachments if MKVToolNix is installed in a path with non-ASCII characters (e.g. German Umlauts). Fixes #2212.
• mkvinfo: the --hex-positions parameter did nothing in summary mode.
• mkvpropedit: adding track statistics tags: for tracks with content encoding (compression) mkvpropedit is now accounting the uncompressed number of bytes, not the encoded (compressed) number of bytes. Fixes #2200.
• MKVToolNix GUI: multiplexer: the subtitle character set can now be set for appended subtitle files, too. Fixes #2214.
• MKVToolNix GUI: multiplexer: when appending, all tracks appended to disabled tracks will start out disabled, too.

Build system changes

• mkvinfo: the GUI portion has been removed. mkvinfo is now a pure command-line program again.