Thanks but I need ISO file
I too have an mpeg, approx. 1.9GB, and a few weeks ago I tried converting it to VOB but it wasn't happening. I sourced that mpeg from this thread a while back. The problem is the frame size. DVD is 720x480 US or 720x576 PAL. The mpeg I have is very good quality but was transcoded to 640x480, so the app I use won't allow authoring to VOB / DVD folder structure. It would be possible to re-transcode that file to a compliant frame size but general rule is you never want to re-transcode something that has already been transcoded because the video quality will degrade. I think there may also be a method to fill that missing space with black bars to make it DVD format compatible, but not something I have tried. Anyway, I digress, there could be a native DVD frame size transcode out there somewhere (I too would like to upgrade this video), but I'd be surprised if it showed up.
The more I read in this thread about proper VHS transcoding techniques, the more I think we need an agreed upon standard for preservation of these rare and quickly disappearing videos before it's too late. I'm sure there would be some differing opinions on minimum frame size and format preference, but personally I'm of the mind that VHS transcodes should be in native DVD resolution mpeg or VOB folder structure for physical DVD player compatibility. Sure, mp4 is a way more efficient codec with equal to or better than quality than mpeg 2 in half the file size, but for physical player compatibility, mpeg 2 / VOB is still king.