

However, Ultra HD Blu-ray specifies up to 128mpbs which disqualifies the Ethernet port right away.

This looks perfectly sufficient for media streaming at first glance. If it does say directly play when you check the server, it could be your WIFI not keeping up with serving the file to the firestick, alot of UHD content can be upward of 60mb per second and if the firestick is some distance away from the router it could be dropping its connection speed from time to time.Īs for network connectivity, the whole Sony Android TV line-up features a 100mpbs Ethernet port only and up to 802.11ac Wi-Fi with 2x2 MIMO rated at 866mbps (on 80MHz wide channels). It is probably the firestick due to a codec, or HDR version, audio or file container (mkv or mp4 for example). Transcoding is the worse scenario for you really, it bascially means somewhere along the line something is incompatible with the file and is stopping direct play, so plex transcodes the file to make it compatible and this needs alot of CPU horsepower. You will see the file playing and if you hover over the playing file it will say either "direct play" / "direct stream" or "transcoding". You can determine this by playing the file on your tv and then opening up the server end software of plex on the PC and looking at your activity dashboard.

Direct play is what your hoping for really, it basically means the file is playing without any sort of conversion and needs very little CPU horsepower at the server side of things. 4k UHD can be hard to get playing right via plex as it has alot of factors dependant on smooth playback. My knowledge is very limited but i would see if the file is playing via "direct play" / "direct stream" or if its transcoding the file i.e.
