mkvmerge: Matroska identification: the `date_local` and `date_utc`attributes will only be output if the identified Matroska file actually contains the 'date' header field mkvmerge: AAC ADTS parser: fixed interpretation of the `channel_configuration` header element for ADTS files that do not contain a program configuration element: value 7 means 7.1 channels GUI: multiplexer: the 'reduce to core' checkbox in the 'audio properties' section will be disabled if the functionality is not implemented for the selected track's codec GUI: multiplexer: the 'AAC is SBR/HE-AAC/AAC+' checkbox in the 'audio properties' section will be disabled if the functionality is not implemented for the selected track's codec & container This workaround was removed during code refactoring in release v15.0.0.

that do not contain the mandatory `SimpleTag` element.

mkvmerge: tags: reintroduced a workaround for non-compliant files with tags mkvmerge: AVC & HEVC ES parsers: performance improvements by copying much less memory around build system: stack protection is enabled when building with clang 3.5.0 or newer on all platforms build system: when building with mingw 7.2.0 or newer, `configure` will no longer restrict optimization flags to `-O2` and use `-O3` again (older versions of mingw suffered from bugs such as segmentation faults with higher optimization levels) build system: when building with clang v3.8.0 or newer, `configure` will no longer restrict optimization flags to `-O1` and use `-O3` again (older versions of clang suffered from excessive memory usage with higher optimization levels)

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