IFOEdit (freeware) is for PC use. If you want a true 16x9 flag, it's a bit of work. Here's what I do:
- Record or dub to a DVD-RAM disc
- Use TMPGEnc DVD Author ($57) (or similar) to import the video to your PC using a DVD-RAM capable drive
- Make a DVD Video & save to your hard drive
- Use IFOEdit to correct the 4x3 flag to 16x9 using these instructions
- Burn DVD-R using TMPGEnc DVD Author, Nero (best) or whatever burning software you prefer