Combining MP4 files on Mac

Zoom's recording of a recent meeting was broken up at 30 minutes intervals into separate files. No idea why, and it has not happened since.

Quicktime easily combined these 720P .MP4 files. Its Share option took only a couple of seconds to export the result so it clearly was not re-encoding. But it put a .MOV wrapper on the result. Since most of the people who will view this recording are on Windows, I wanted to keep MP4 format.

A brief internet search did not show any way to get Quicktime to preserve MP4 format. I discovered that the iMovie MP4 output option clearly does re-encode. it took about 5 minutes and the result was a 5 times bigger file with some loss of quality. Forget that.

I eventually discovered that I already had a simple converter app in the Parallels Toolbox collection that came with Parallels Desktop. It took a few seconds and increased file size only slightly. So I do have a workaround.

But for the future, is there a better way to combine .MP4 files on Mac, with no re-encoding or change of format?