DVD Workshop - source file size vs. space taken on DVD

[darkwunder]

Using TMPGEnc, I encoded four 40 minute episodes of a TV show to VBR NTSC DVD compliant files (MPEG-2, AC3). I determined the bitrate and GOP settings using the Bitrate and GOP Calculator from dvd-hq.info. I assumed that if I wanted to fit the files on a single 4.7GB disk, I should be aiming for a total combined file size of 4GB for the 160minutes of video.

Anyways, when I go to author the DVD using DVD Workshop, it tells me that I need 7GB of DVD disk space to burn the four files. Does this make sense, given that the source files only total 4GB in size? I have not included in menus up to this point.

I have previously authored several DVDs for a single 4GB file, and the required DVD disk space always seems to be pretty close to the source file size. Have I missed some additional disk space overhead that needs to be considered when burning multiple files to a disk?

Hopefully I have made some sense : . Thanks for your help,
DW

[Scheif]

I suspect that DVDWS has not inspected your assets for DVD compatibility and is presuming that it will have to rerender your video and convert your audio to 48 kHz LPCM. I suggest doing a quick burn to your hard disk with "Don't convert complaint files" checked. Then, see how much disk space is actually consumed.