www.makemkv.com

Hello,

I wanted to clarify, can MakeMKV burn my Blu-Ray and 4k movies (ISO) files to mkv format, so I can play it on my UBP-X800M2 4K UHD Blu-ray Player? If so, is there any loss of audio and picture quality?

I've DVDFab and CloneBD to burn them to disc, but keeping read errors. Friend advised to convert them to mkv files.

If you have read errors no program can help you. Clean the disc with liquid soap and warm water. Then dry with a paper towel and cleand again with a microfiber cloth.
Next approach if all of the software fails you tried before: Rip to folder with Makemkv. Convert to ISO with Imgburn.

Good luck!