YAMB is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is Avidemux, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to YAMB, but unfortunately only two of them are available for Mac. If you can't find an alternative you can try to filter for web or SaaS options.
Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs. Tasks can be automated using projects, job queue and powerful scripting.
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.