Just wanted to post my findings…
I was able to play:
-DVD’s single layer (w/subtitles)
-DVD’s dual layer (w/subtitles)
-mkv and mp4 on DVD Single layer (w/subtitles)
on the WD TV Live by using the Samsung SE-208AB external slim DVD writer using the AV Connectivity mode.
-mkv and mp4 on DVD Dual layer
plays but, its choppy and unable to RW or FF, although subtitles work.
hope it helps, been waiting for this a long time.