I don’t know if this is related or not, so please ignore if isn’t but it seems to me that Plex has an issue playing video on some clients when there are multiple audio streams…
I had some very odd issues with the standard definition version of BBC1 here in the UK, a while back, on both the Tizen and Xbox apps, as the channel advertises multiple streams:
No audio for BBC1 on Freeview in Tizen Preview - Plex Players / Smart TVs - Plex Forum
New Xbox One App preview - Plex Players / Gaming Consoles - Plex Forum
On the XBox app I got no video or audio and on the Tizen app I got no audo- my workaround was to set my language so I didn’t need to press Plex staff further, or share log files and I haven’t tested it again recently.
