I have it, but haven't used it much at all. I thought it could be used as a standalone video compressor, a la Handbrake.
Duh lol. I have thousands of m2ts files. They're created on my computer when I load a video file from my Sony video camera onto a hard disc from Sony's software. They originally were AVCHD files, which is what Sony and Panasonic collaborated on. A highly compressed video file. QuickTime X, the one that comes with all newer os's, plays m2ts files natively, and can also export them as quicktime files .
Another method is you can right click your video file, and at the bottom select "Services." Then select "Encode Selected Video Files." That opens a popup menu that asks how. 1080p? 720p? 480p? Audio Only? Apple Pro Res? Choose. Then below it asks why. "Greater Compatibility?" Or "Higher Quality?" Then where to save it. Choose, then click, and it begins the encoding process to an mp4 video in the background.
If you have a Mac that is not using 10.15 Catalina and you have QuickTime 7 Pro that is "registered," meaning it displays a code from the purchase of it in the about qt7. If you don't know, open a .mov or .mp4 file and try to edit it, by changing the bass or brightness. If you can then you're good, and HOLD ON TO THAT APP! If you delete it, Apple will not restore it any longer. You can open the freshly exported QTx file in QT7 Pro, then edit, cut, change audio settings, color, brightness, etc, and save. Also using QT7 Pro you can use it's "export for web" function, meaning QT 7Pro assembles a package for internet uploading automatically, including a .png (picture) "poster frame" that you select yourself, the converted .mp4 file, a small .mov of the file, and the "read me," HTML file instructions. It's an all in one web video creation machine.
Of all the things Apple has done away with, QT7 is missed the most by me. It made life so easy, but it was 32 bit and Mojave is the last OS to allow it, with warnings. I really wish they would have given QTx the same functionality.
It sounds complicated, but it's very, very easy, and once you've done it once or twice, it's a no brainer. So there are some options that exclude opening compressor, or FPX, or any third party apps.