How were the video dvds put together? Were they copies of other dvds, or video files you made into dvds? For turning videos into DSVD's, I usually recommend Devede, it does all the work of making the dvd image, or files, and the result can be burnt. If you're trying to copy, perhaps the copy-protecition stuff ids screwing up the copy. I've no idea regarding the mac, never used one, but have had no issues with linux in making them, or copying them. If you could provide more detail on what you're actualy doing, i may be able to narow it down more. Cheers.