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# Version 22.0.0 "At The End Of The World" 2018-04-01

## New features and enhancements

* mkvmerge, MKVToolNix GUI multiplexer: AC-3, DTS, TrueHD: added an option for removing/minimizing the dialog normalization gain for all supported types of the mentioned codecs. Implements #1981.
* mkvmerge: AV1: added support for reading AV1 video from IVF, WebM and Matroska files.
* mkvmerge: FLAC: mkvmerge can now ignore ID3 tags in FLAC files which would otherwise prevent mkvmerge from detecting the file type. Implements #2243.
* mkvinfo: the size and positions of frames within "SimpleBlock" and "BlockGroup" elements are now shown the same way they're shown for other elements (by adding the `-v -v` and `-z` options).
* MKVToolNix GUI: multiplexer: added options for deriving the track languages from the file name by searching for ISO 639-1/639-2 language codes or language names enclosed in non-word, non-space characters (e.g. "…[ger]…" for German or "…+en+…" for English). Implements #1808.
* MKVToolNix GUI: info tool: implemented reading all elements in the file after the first cluster. Only top-level elements are shown; child elements are only loaded on demand. Implements the rest of #2104.
* MKVToolNix GUI: info tool: added a context menu with the option to show a hex dump of the element with the bytes making up the EBML ID and the size portion highlighted in different colors. In-depth highlighting is done for the data in `SimpleBlock` and `Block` elements.
* MKVToolNix GUI: chapter editor: added an option to remove all end timestamps to the "additional modifications" dialog. Implements #2231.

## Bug fixes

* mkvmerge: MP4 reader: fixed reading the ESDS audio header atom if it is located inside a "wave" atom inside the "stsd" atom.
* mkvmerge: MP4 reader: AAC audio tracks signalling eight channels in the track headers but only seven in the codec-specific configuration will be treated as having eight channels.
* mkvmerge: MPEG TS reader: fixed wrong handling of the continuity counter for TS packets that signal that TS payload is present but where the adaptation field spans the whole TS packet.
* mkvmerge: the 'document type version' and 'document type read version' header fields are now set depending on which elements are actually written, not on which features are active (e.g. if a `SimpleBlock` is never written, then the 'read version' won't be set to 2 anymore). Part of the fix for #2240.
* mkvmerge: the 'document type version' header field is now set to 4 correctly if any of the version 4 Matroska elements is written. Part of the fix for #2240.
* mkvinfo: summary mode: the file positions reported for frames in `BlockGroup` elements did not take the bytes used for information such as timestamp, track number flags or lace sizes into account. They were therefore too low.
* mkvpropedit, MKVToolNix GUI header editor: the 'document type version' and 'document type read version' header fields are now updated if elements written by the changes require higher version numbers. Part of the fix for #2240.
* mkvpropedit, MKVToolNix GUI header editor: mandatory elements can now be deleted if there's a default value for them in the specifications. Fixes #2241.
* source code: fixed a compilation error on FreeBSD with clang++ 5.0. Fixes #2255.

## Build system changes

* A compilation database (in the form of a file `compile_commands.json`) can be built automatically if the variable `BUILD_COMPILATION_DATABASE` is set to `yes` (e.g. as `rake BUILD_COMPILATION_DATABASE=yes`).