www.makemkv.com

MakeMKV usually deals with Profile 7 Dolby Vision from UHDs. I don't have much experience with how it behaves with DV profile 8.1. If you have a license for MakeMKV, you can use older versions. https://makemkv.com/download/old/ I did try a couple older versions since I also thought maybe it was 1.1...

I am opening an MKV file with Dolby Vision and HDR10 fallback in MakeMKV and then pressing the MakeMKV button to save the file. Here is the HDR MediaInfo for the original file: Dolby Vision, Version 1.0, Profile 8.1, dvhe.08.03, BL+RPU, no metadata compression, HDR10 compatible / SMPTE ST 2086, Vers...