Plex Transcoder segfault libavformat.so.59

Plex Media Server
,
3

Are you using a smart tv as your player? Samsung or LG? It sounds similar enough to this post you should probably take a look.

An employee asked for logs there so if it sounds like the same issue maybe drop yours in there also

LG C9 TV: Conversion failed. The transcoder exited due to an error happening occasionally
Conversion failed playback error when subtitles are over (usually at the end)