Apple - How to create a playlist in Quicktime Player for many files in separate subfolders?
Quicktime Player (X or version 7) doesn't support playlists to my knowledge. You could add the files to a playlist in iTunes, or download VLC. I'd highly recommend VLC, it's free, it can tackle pretty much any format you can throw at it (including .mov), and you can just drag and drop files to a playlist to queue them up very simply.
If you create your own movie player using the QuickTime Framework it's possible to add whatever functionality you want. QuickTime Player itself does not appear to offer playlist capability on Mac OS X. Here's a few screen captures of my movie player using a playlist:
Try Graphic Converter. It's good for lots of other things but you can use its slideshow features to play, for example, all the movies in a particular folder. Other than making sure the movies you want are in the folder, you don't have to actually make any kind of playlist. If you have .jpgs in the same folder, it will include them too, as part of your slideshow.
It's shareware, and well worth the US$35 for all the other stuff it does too.
But you can use it for free for a month or so, uncrippled, to see everything it can do.
I don't have the website handy but if you do a search, you'll find it easily enough. LemkeSoft, I believe, is the developer.