I have a 100% repeatable issue in the HTML5 player. If subtitles are turned on while the video is playing, the message "There was a problem playing back this item" comes up for a few seconds, before the page refreshes and continues playing the video from about the same place with subtitles turned on. Here are the specifics of my situation:
Files: Bluray rips, all re-encoded with Handbrake's "High" preset, in .mkv files. All subtitles are PGS format, from the Blurays.
Player: Plex Web HTML5, in both the server's own Plex Web and plex.tv/web
Browser: Firefox 46.0.1, but I've been seeing this since I started using the HTML5 player around Firefox 44 (before that, it wouldn't reliably play my video files regardless of the transcode settings, so I was using the Flash player only).
Server: Windows Server 2012 R2 on a E3-1231v3; running 0.9.16.6 on Plex Pass Update Channel, I've been seeing this for a few server versions as well.
"Burn Subtitles" setting: Does not matter, I have tested all three. Obviously I didn't expect this to be a factor since PGS is an image based format.
In this case what I'm looking for is the logic behind the HTML 5 player to switch streams without displaying the error message. I understand there is re-buffering required because the server either has to start transcoding when it wasn't before, or has to restart the transcoding. I just want the error to not be displayed.