DVD and Blu-ray are not the same at all but it seems you're using the terms interchangeably.
Blu-ray has no interlacing almost 100% of the time, unless you're talking supplemental videos and extras that were originally created for DVD special features and then just dropped into the Blu-ray disc. Even then it should be progressive scan instead.
If you have Blu-rays just use that as your source and skip deinterlacing entirely. Rip, demux, edit the demuxed file. Done. DVDs are a lot more work to get into an editable form, for lower quality, and you not only have to worry about deinterlacing but probably also correcting the frame rate from 29.97 to 23.976