From Newsgroup: alt.comp.freeware
"MKVToolnix is a freeware utility that allows you to create, alter, inspect audio and video files. The program is named for the MKV (Matroska) file format but works with many others including AVI, MPEG, MP4, MPEG, MPEG1/2, h264, and more. Audio file support includes AAC, FLAC, MP2, MP3, AC3, DTS/DTS-HD, Vorbis, and subtitle formats cover SRT, PGS/SUP, VobSub, ASS, and SSA."
https://www.portablefreeware.com/index.php?id=3004
Home Page
https://mkvtoolnix.download/
Release Notes
https://mkvtoolnix.download/doc/NEWS.md
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