* mkvmerge: Ogg Opus reader: packet timestamps aren't calculated by summing up the duration of all packets starting with timestamp 0 anymore. * mkvmerge: audio packetizers: mkvmerge will now keep discard padding values if they're present for packets read from Matroska files. This avoids the JSON library throwing an exception and mkvmerge aborting on such data. * mkvmerge: JSON identification: mkvmerge will ensure that all strings passed to the JSON output modules are valid UTF-8 encoded strings by replacing invalid bytes with placeholder characters. Otherwise the first key frame of a video track might be dropped if it isn't the first in presentation order. * mkvmerge: MPEG TS reader: when reading MPLS mkvmerge will now compare the MPLS's start and end timestamps against the transport stream's PTS instead of its DTS. * mkvmerge: TrueHD/MLP packetizer dialog volume normalization removal isn't attempted if the track is an MLP track as the operation is only supported for TrueHD, not MLP. * mkvmerge: MLP code: fixed various issues preventing MLP from being parsed correctly. This is the HEVC analog to what was fixed for AVC in #2325. * mkvmerge: HEVC/h.265: fixed file identification failing for certain elementary streams due to internal buffers not being cleared properly. * mkvmerge: AVC/h.264: fixed file identification failing for certain elementary streams due to internal buffers not being cleared properly. Together with an additional fix to how translation files are located, MKVToolNix can now use all interface languages on macOS, too. * macOS: translations: updated the `build.sh` script to build `libiconv` and a complete `gettext`. * Linux: starting with release 25 an AppImage will be provided which should run on any Linux distribution released around the time of CentOS 7/Ubuntu 14.04 or later. * mkvmerge: Matroska & MPEG transport stream readers: the encoding of text subtitles read from Matroska files can now be changed with the `-sub-charset` parameter. * mkvmerge: SRT/ASS/SSA/WebVTT text subtitles: a warning is now emitted if invalid 8-bit characters are encountered outside valid multi-byte UTF-8 sequences. Note that this build type isn't supported.* mkvmerge: SRT/ASS/SSA text subtitles: for files for which no encoding has been specified, mkvmerge will try UTF-8 first before falling back to the system's default encoding. Several merge requests where accepted that improve compilation on MSYS2 on Windows.

MKVToolNix GUI: multiplexer: color parameters that are floating point numbers (minimum/maximum luminance, projection pitch/roll/yaw) will only be set to a value during identification if the identification actually contains the property, and not to 0 anymore if it doesn't.

MKVToolNix GUI: multiplexer: when reading color parameters from identified files that are floating point numbers (minimum/maximum luminance, projection pitch/roll/yaw) the numbers will be formatted in floating-point notation instead of scientific notation as mkvmerge only supports the former.

mkvmerge: AV1 OBU parser: fixed identifying files that only contain single frame.MKVToolNix GUI: when adding directories via drag & drop/copy & paste the GUI will now offer the user the option to create one multiplex settings tab per directory & adding all files from that directory to the corresponding, newly created tab.If you only want to relocate the preferences INI file, you can store the desired file name for the INI file in `MKVTOOLNIX_GUI_CONFIG_FILE`. If set, the variable `MKVTOOLNIX_GUI_STATE_DIR` can point to a directory where the GUI stores both the job queue sub-directory and the preferences INI file. MKVToolNix GUI: the user can now control where the job queue files & the preferences INI file are stored via environment variables.

Mkvtoolnix