DVD-Video supports any combination of 16,20, 24 bit and 48, 96 sampling rates.
DVD-A can support 16,20, and 24-bit and 44.1, 48, 88.2, 96, 176.4 and 192 kHz sampling rates.
Disc Welder is only necessary for creating DVD-A discs. It is not necessary for creating DVD Video discs with audio and a still shot . You should be able to create these discs with any DVD Video software as long as it supports the desired bit and sampling rates. 16/48 shouldn't be a problem, higher rates will depend on the software.
*Note
I have not tried this yet but I will as soon as the DVD burner arrives this week
)
Joe