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mkvmerge-gui

Batch subtitle muxer for Windows: merge SRT/ASS/SUP, audio, chapters and fonts into MKV in bulk. Bundled mkvmerge — no MKVToolNix install. Folder scan, auto-match sidecars, embedded sub control, optional 3D PGS fix. Pairs with File Renamer by Syenar for Plex filename cleanup.