Problem reading DVDs on my Mac

Hi there - I bought a 2 DVD set here on rocket stoves (the Better Wood Heat set and the Wood Burning Stoves 2.0 set).  I've got an order Mac computer with a built in CD/DVD slot.  I can open and read all four of the Better Wood heat set just fine, but none of the four DVDs in the Wood Burning Stoves 2.0 set will open for me.  The Mac is all I have to read the DVDs on, and when I insert any of the 2.0 set, the computer will make three attempts to open the disk, and then will spit it back out.  Has anyone else either had this problem, or have any ideas on where to go from here?Hel  One disk might be understandable!, but to have all four in the set be unreadable doesn't make any sense.  I'm not really cheap, but I hesitate to buy another set only to have the same problem.  Help!

Try VLC...here are some instructions that might be helpful.

https://www.applegazette.com/applegazette-mac/rip-dvds-with-vlc-mac/

Just a late update - I ended up digging out an old DVD player hooked up to the TV and ran the discs ok.  Must be just a problem with my old Mac and the fact that I can't update the operating system or peripherals.  Thanks for the help anyway.