Quality of VHS converted to DVD I work for a small library. We have a collection of VHS tapes that we have recorded to DVD using a Magnavox VHS HQ DVD recorder. They came in as .ogg, They came in a a set of files including some .VOB which I can play by changing the file extension to .mp4. How much quality have I lost in this conversion? Is there a way to convert VHS to digital with higher fidelity?

The collection has historical value, so there is some debate on whether we need to save the original VHS tapes as opposed to just keeping the videos in electronic format (on a server that is backed up nightly). 

Edit:
A bit of new information:

I used GSpot to determine the codec (I don't have admin/install rights on my computer, so that is the only program I could use), and it says mpeg2. Does any of this information help with the original question?

Edit2:
I'm such a dumb dumb. I had all these people trying to figure out why my files were .OGG. They weren't. They were .VOB. What was on the DVDs is exactly what Perter Cordes described below. Now that I've sent people on a wild goose chase...
One big loss in converting VHS to DVD arises from going through the composite domain. Both VHS and MPEG2 use a separated chroma paradigm -- on the VHS tape are two signals, essentially luma and bandwidth-limited chroma. MPEG2 (the standard for DVD) also uses separate luma and chroma. But the standard output from a VHS player combines the signals in a way that means the MPEG2 encoder must do a rather imperfect job of unmixing them again.

One solution, such as it is, would be to use a VHS player that has separate luma and chroma outputs, called S-Video, and an encoder that can work directly with S-Video components.

I'm not saying you'll get beautiful results, because nothing about VHS is beautiful to begin with. But you would be sure of getting a conversion that doesn't suffer unnecessary losses.