No. Probably not. (DVD not correctly looking at folders. More likely, DVD is not showing you files it can't play. An .exe, for example. Also, don't forget, some things will actually check the file header to see if it really is that type of file, and not present it to you. e.g. Renaming .txt to .mp3 may, in some cases, still not show you the .mp3 file - it's checked the file headers, the mp3 media information is not present, and tosses it as a playable candidate. One way some things might demonstrate this, aside from not even displaying the file, is to display that the file is not playable, before you've even asked it to play that file. Incorrect file header being different than a broken .avi index, for example.)
(This is not a wi-fi issue, so please let's eliminate all comments about wi-fi in this thread, particularly with regard to firmware.)
Shareport access proves successful connectivity of files within drive to router, and router's ability to make the files available.
To the best of my knowledge, confirmation / correcton appreciated, UPnP, server or client, only shows files / folders / content of media files it has knowledge of (as being media files).
I have not experimented with the specifics, but you could try this:
- go to a folder where you see content that is displayed as being available. Note the file type.
- go to a folder where you expect to see content, but don't - make a dummy file there of the same extension. Does it show up now? (Perhaps after a reboot of the router - I saw something about only a reboot causes the router to rescan the files to build up its index of what it should make available.)
- (hard part) Figure out an extension that your dvd player doesn't recognize as being content playable (.mkv?), but the router does. [You could thus prove what the router shows you vs what your dvd player shows you. For that matter, if your dvd player will play all such files from a disc, it should be the same test - the issue for this aspect is not upnp / router presentation, but what the DVD player recognizes as being playable.]
The real telling point for figuring out where things are breaking down is to be able to see the files, or not, from a 2nd viewing pathway - such as a computer / vlc / playlist / local network / universal plug'n'play.
If you really want to isolate this, turn on web access on the router, go to the router:8181 - if you see the files there, but not on the dvd player, you've confirmed the dvd player doesn't understand the file type.
Further, if you see the file type within vlc, or not, and not on the dvd player, then you've isolated whether the file is present (http), presented (vlc), playable (vlc), visible (dvd).
Summary: I believe only certain (media) file types are presented, and only some of those any particular device understands. [Confirmation / correction welcome / appreciated.]
Guessing.
CDN$0.02
YMMV