# Version 42.0.0 "Overtime" 2020-01-02
## New features and enhancements
* mkvmerge: added an option for creating byte-identical files:
`--deterministic <seed>`. Part of the implementation of #2698.
* mkvmerge: Matroska reader: mkvmerge will remove the `icpf` atom headers if
they're present in frames read from Matroska files. Implements #2692.
* mkvmerge: MP4 reader: ALAC tracks: the number of channels, sampling
frequency and bit depth are now taken from the bitstream in order to fix
bogus values on the container level. Implements #2714.
* mkvpropedit: when changing track UIDs the referring elements in existing
chapters & tags will be updated automatically, too. Part of the
implementation of #2700.
* mkvinfo: when the option `-p`/`--hex-positions` is used, element positions
will be output regardless of the verbosity level. Part of the implementation
of #2713.
* mkvinfo: added the option `-P`/`--positions` for showing the position of
each element in decimal regardless of the verbosity level used. Part of the
implementation of #2713.
* mkvinfo: added the option `-o`/`--continue` for continuing processing when
the first cluster is encountered regardless of the verbosity level
used. Part of the implementation of #2713.
* mkvinfo: added the option `-a`/`--all` for outputting all sub-elements (even
cues & seek head entries) and not stopping at the first cluster regardless
of the verbosity level used. Part of the implementation of #2713.
* MKVToolNix GUI: multiplexer: added an option in the preferences for
disabling adding cover images from Blu-ray discs. Implements #2693.
* MKVToolNix GUI: multiplexer: added mkvmerge's new `--deterministic` option
in the "additional command-line options" dialog. Part of the implementation
of #2698.
* MKVToolNix GUI: header editor:: when changing track UIDs the referring
elements in existing chapters & tags will be updated automatically,
too. Part of the implementation of #2700.
## Bug fixes
* mkvmerge: HEVC ES parser: fixed a bug in the slice parser calculating the
size of a field which in turn could have led to the slice's type being read
wrong. Patch by Torsten Hauska. Fixes #2710.
* mkvmerge: Matroska reader: fixed a segmentation fault when trying to read a
file that uses header removal compression but no removed bytes are present
in the track headers. Fixes #2687.
* mkvmerge: MPEG elementary stream parser: fixed an invalid memory access and
use of uninitialized memory that could happen under certain
circumstances. Fixes #2690.
* mkvmerge: RealMedia reader: fixed a division by zero when all audio
timestamps were zero. Fixes #2689.
* mkvmerge: RealMedia reader: fixed an invalid memory access in the video
frame assembly code triggered by invalid data in the file. Fixes #2691.
## Build system changes
* `std::optional` (C++17 feature) is now used instead of `boost::optional`.
* `std::regex` is now used instead of `boost::regex`.
## Other changes
* New man page translations into French, Italian, Russian and Chinese
Traditional have been added.