I have been fighting this issue for the past several weeks and makes Emby very unusable when viewing anything remotely. For some perspective, before this issue, I had no problem viewing Live TV and recorded content while on mobile (720/1.5 setting).
Now I am having problems constantly. Every time I have a problem I'll click the wrench and see what it shows for quality, and I am pretty sure every time there is an issue it will say Auto 720/1.5. When I start playing the show, however, it will not say Auto but the Emby web app changes to Auto 720/1.5 over time. 720/1.5 is what I have it set to in playback settings.
A theory??: maybe when out driving around and Emby senses a pause or low data flow, it will switch to Auto and get all goofy instead of just sticking to the original 720/1.5 setting and filling up the buffer when data throughput picks back up like always did before???
Not sure if the Auto deal is part of the problem or not. I always have it set to 720/1.5, and never Auto.
As for the problem, the player/screen will go BLACK and just totally stop playing anything.
If I have a solid 40+MB LTE connection, it seems to not happen as often, possibly not at all, compared to the typical varying LTE connection.
I grabbed my other phone on the way out the door and quickly took a couple videos.
#1 shows you exactly what I am talking about. Video starts to sputter, I check the wrench and it had switched to Auto 1.5/720 and then it totally stops playing with black screen.
#2 shows the video playing with no issues at all. I click the wrench and it's at 1.5/720 and never switches to Auto.