PicturesToExe or PTE has been available for PC users only for many years. A Mac version is now available for Beta testing. I made a short trial slideshow which I exported as an HD video and viewed on my widescreen TV. The quality of the images (not my photography!) was excellent.
If you need a good introduction Barry Beckham has many useful tutorials. These can be found on YouTube or Beckhamdigital.com . His voice may not be to everyones' taste but the content and pace is very good.