www.makemkv.com

If the rip is succeeding, the disk is being read - what you have are the contents of the disk. MakeMKV is doing a checksum on the data as it rip, and comparing it to the checksums on the disk. To have a corruption, the on-disk checksum would have to match the ripped checksum, which is rather difficult to do.

As for PLAYING, that's dependent on a lot of things, including bandwidth. Are you writing to the same place?

I guess it comes down to are you hitting some sort of resource constraint? Or is there a problem with the file?

If you're running macOS Sonoma, then presumably your Mac isn't ancient (though 14.5 is current, not 14.3). That said, playing UHD files is a non-trivial affair. IINA is a very nice GUI wrapped around MPV. I have both on my old Intel iMac. MPV supports using Apple video decoder hardware acceleration and is the only way my iMac can successfully play a UHD. I believe by default IINA will use hardware acceleration as well.

File corruption is very unlikely, but not impossible. Strange corruption issue - MakeMKV's fault or bad HDD? In that thread, a user was indeed having file corruption from a bad USB chipset on his computer. There's an ffmpeg command listed in that thread that can help determine if your .mkv file is corrupt.

Turns out, the original poster was doing so just to make a link to their website, added to their signature after the message was approved.

The original post (and poster) are now gone.