There are many alternatives to remux for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac alternative is MKVToolnix, which is both free and Open Source. If that doesn't suit you, our users have ranked nine alternatives to remux and six of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to remux are Subler (Free, Open Source), MKVtools (Free), MKV Video Converter (Paid) and MKV2MP4 (Paid).
MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some. The latest builds now have the ability to create WebM compliant Files.
Subler is a Mac OS X application that opens media containers, allows you to add or remove media tracks inside them, and then saves them out again. In the specialized language of the video world, Subler is a “transcoder” or “demuxer” depending on how you use it.
Best MKV video converting software to download online videos from YouTube, Facebook, Twitter, etc., convert 4K UHD/HD/SD MKV to any popular format, game consoles, devices, VR, TV, editors, online sites without losing any quality in super-fast speed.