I, too, have an RT-AC5300.
Alpha 2 works fine, so long as you add no media to the large media drive attached to the router to serve the network...minidlna. It will not rebuild the media database for additions, so whatever you have when you install the Alpha is all that you may use. I tried ejecting the drive, deleting the minidlna folder along with the 6 files written to the drive root. I reinserted the drive and loaded it. After about 20 minutes, cpu activity had stabilized at 2% each...normal loafing for the 5300. When media play was attempted on the network, the file structure was present, but minidlna saw NO PLAYABLE media.
I ejected the drive, again removed these indexing files/folders, moved back to the stable RT-AC5300_384.8_2 firmware, then connected the drive. After 20 minutes, the router again was loafing. Tried to play media on the network, and all was normal. ALL MEDIA, including new material, was present and played as usual.
Long story short, the alpha 2 seems to break the minidlna file addition protocol, and it refuses to rebuild the indices when a basic media drive is connected, essentially for the first time.
Eric,
This is what I tried to set minidlna right again. If it would help, I'll put Alpha 2 back in use, add a new mp4, and see if it picks up the updated content. Then, I'll look at the log...
Before I deleted the index files to try a total rebuild, I copied the minidlan.log. It runs fine until this started:
[1969/12/31 19:07:37] monitor.c:299: warn: rowes=227, num_watches=227
[1969/12/31 19:08:15] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:08:15] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:08:15] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:08:17] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:08:17] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:08:17] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:32:00] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:32:01] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:32:01] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:35:04] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
[1969/12/31 19:35:04] upnpevents.c:369: warn: upnp_event_send: send(): Connection refused
These repeat for pages and pages in notepad.
Hope this helps!