MKVToolNix 18.0.0 continues the monthly series of stability and reliability updates by adding performance improvements to both the AVC and HEVC ES parsers thanks to the implementation of support for copying much less memory, and enabling stack protection when building the program with Clang 3.5.0 or a new version. This release also reintroduces the workaround that was removed in MKVToolNix 15.0.0 due to code refactoring for non-compliant files containing tags that do not include the mandatory SimpleTag element. Moreover, there’s now full support for both MinGW 7.2.0 and Clang 3.8.0 compilers.