Have you checked the Plex knowledge base and searched on the sub and Google: Yes, extensively
Server version: 18.104.22.16829
OS: macOS High Sierra (10.13.4)
Clients, w/ versions, if applicable: Apple TV, latest app version
What happened? I randomly get the error “Playback was terminated by the server. Conversion failed. The transcoder crashed or failed to start up”. This happens randomly when watching just about any movie, with or without subtitles.
What you did? Many said previously to delete the contents of the codec directory and restart the server. However after doing this multiple times the issue still persists. Movies will randomly stop playing half way through, give or take, and display this error.