I have a damaged DVD that skips badly and is unwatchable when played on a normal DVD player. I ripped it on the Mac (using [Mac The Ripper](http://www.mactheripper.org/) – great program!), and the resulting VIDEO_TS folder seems to play back fine using DVD Player in OS X.
However, I wanted to be able to play it on a normal DVD player again.
One option would be to convert it to an MPG or AVI using something like [Handbrake](http://handbrake.m0k.org/), and then use iDVD to burn a DVD from that. It takes some time to convert and render a DVD, though, and you’d lose some quality.
Then I found this method to turn a VIDEO_TS folder into an ISO image. At the command line, type:
>hdiutil makehybrid -udf -udf-volume-name DVD_NAME -o DVD_NAME.iso /VIDEO_TS/parent/folder
Make sure that final path is the path to the folder where VIDEO_TS can be found, not the path to the actual VIDEO_TS folder itself.
It takes a little time, but you get an ISO image out. You can then burn this using Disk Utility, and you’ll get a ‘real’ DVD!