I have Emby Server running on my iMac which is running OSX High Sierra. I have my music, movies and tv shows on my FreeBSD server which is running FBSD 12.1 (latest patches). The server is running Samba 4.10. I have a share setup for all my media files which both Emby and iTunes have access to.
My ACL permissions on my FBSD server are set correctly. I can access the Samba share from my iMac. iTunes has no issues downloading or playing music, tv or movies from the share. I can delete, move and otherwise modify files on the Samba share. Everything is authenticated through Active Directory which is also running on my FBSD server in a jail.
The install of Emby on the iMac went without issue. Emby accesses the media directories and shows all the media. It will play the music files. It will not play any videos files.
The error for video files depends on which client I use. When accessing Emby using the iMac, it will "play" the video file but there is no video or audio. It shows a black screen with a time progress metre moving as time ticks away. There are no errors provided.
When I access it from another computer on the network, it gives me the "Playback Error - No compatible streams are currently available. Please try again later...".
I've attached the ffmpeg transcode log file for your review.
Is there something basic that I'm missing?