If you have a lot of DVDs and want to import DVD into iTunes on Mac without buying them on iTunes AGAIN, you can follow this step by step guide on how to put DVD to iTunes on Mac OS (Snow Leopard included).
Before you learn how to import DVD movies into iTunes on Mac, you should know that iTunes only reads MP4 and MOV videos. Unless you copy DVD movies to MP4 or MOV format, there is no other way to import DVD into iTunes on Mac. Therefore, before import DVD to iTunes, you need to convert/rip DVD to MP4 or MOV with your favorite DVD converter for iTunes. Here DVD Ripper for Mac is recommended.
Then, just insert DVD on the DVD-ROM and import your DVD movies into through "Load DVD". Alternatively, you can hit "Load IFO" to import IFO files.
From the "Format" drop-down list, choose "MP4". Go to "Output" to set the output directory. You can also adjust other settings such as video quality, audio track, Bitrates, aspect ratio, brightness, contrast, saturation, etc.
Hit the Convert button to start conversion which will take some time. If you don't want to wait around during the Mac DVD to iTunes conversion, just check "switch off the computer automatically when the conversion is done". If you want import not only DVD but other audio/video into iTunes on Mac, this all-in-one DVD Video Converter for Mac is the best choice for you.