What would be the fluent, inexpensive way to get MP4 videos  (via AVI?) to DVDs with menus?
I doubt my old Pinnacle Hollywood supports the formats and resolutions the phone cameras use.
 

I'd be interested in the answer to this too. I have NCL's  VideoPad software for making and exporting vids, but it always fails when I try to burn to DVD.

I have Sony Movie Studio Platinum and I have just checked the render options. There are options to burn to either DVD or Bluray and with or without menus.
 
That said, I haven't tried it yet as I normally go straight to YouTube.
 
http://www.vegascreativesoftware.com/gb/vegas-movie-studio-platinum/
 
I think DVD Architect (I'm sure most of us here know of CD Architect) does more in terms of menus and stuff, but is more expensive:-
 
http://www.vegascreativesoftware.com/gb/dvd-architect/
 
 

This one is free:
https://www.dvdstyler.org/en/ 
Here is a link to PCWorld's Review on this:
https://www.pcworld.com/article/217843/DVDStyler.html
 
I have used this one:
http://www.aimersoft.us/dvd-creator.html
But it is not free! It is only $24.95 though...
 
Note I don't think any of these do Blu-ray