I know there are a lot of converters. One of them is free, and excellent (Handbrake) because it is open sourced, and most importantly free. However, I always go back to Wondershare Video Converter (both Mac and PC) because it simply works and supports HEVC from way back when the Samsung NX-1 series first became available.
I only really use the conversion features, but it has other things I don't use such as the editor and burner. I just drag and drop the videos I want converter, and let it do its thing in a queue.
Lately I've also been combining a lot of video clips from GoPro and Sony Action cams. I appreciate their software is Intel optimized as well as GPU enhanced processing compared to Sony's free Play Memories Home software. It really saves a lot of time.
Look out for sales on these.