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MKVToolNix 9.1.0 Free MKV Manipulation Tool Adds Support for WebVTT Subtitles

Probably the most important change is a patch for a bug that could lead to MKVToolNix using more than 2 GB or RAM when attempting to load stored settings form JSON files. The patch is nothing more than an update to the JSON library, as explained by the developer in the official release announcement.