Do you have a DVD player plugged into your mac.
Click on the Desktop and click on Finder> Preferences> and check the box for CDS, DVDs and iPods
this so the DVDs icon will appear on your Desktop.
Place the DVD in the DVD player, and quit any software that starts up when a DVD is inserted.
Double-click on the DVDs icon on your Desktop, a Finder window will open, you will see two folders Video_TS and Audio_TS.
Make a new folder on your Desktop with an appropriate name for the content of the DVD.
Drag the Video_TS folder to the new folder you created. (the Video_TS folder contains both the video and the audio.)
Download this free app, https://handbrake.fr this will convert the Video_TS folder to mp4 files suitable for
viewing and sharing. mp4 is a widely accepted format. Although it may be daunting at first it is quite simple to
get the basics, if you are going to share your videos online then use the Web group under Preset, choose the lowest
resolution so files aren't too big for uploading. Experiment a little to get an optimum balance between file quality
and size for uploading. Remember uploading can take quite along time.