I am noticing that some files that can play directly on the Shield (through VLC), seem to be forcing a transcode through PLEX. I can also use Plex’s DLNA in VLC and they direct play without issue, it seems to be the plex app.
I have some logs and more details here: https://forums.plex.tv/discussion/221492/issue-with-direct-playback-other-similar-media-can-direct-play-without-issue
