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Fatal Playback error - Printable Version

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Fatal Playback error - ACE - 2025-10-04

Hi 

Jellyfin novice here.

I managed to install jellyfin on my ugreen nas using docker. Added media and got some of it working streaming to my TV, but there are many items that dont work on the TV get the "fatal playback error" on the desktop in firefox

All of the folders have a read/write permission and from what i have read there must be a transcoding error? 

Here is an example from my logs (i have no idea what any of this means  Upside-down-face )

[2025-10-04 12:54:26.006 +00:00] [INF] [21] MediaBrowser.MediaEncoding.Transcoding.TranscodeManager: Deleting partial stream file(s) "/config/cache/transcodes/3bb879e0e2c7db210a954359a53b29f7.m3u8"
[2025-10-04 12:54:27.509 +00:00] [INF] [21] Emby.Server.Implementations.Session.SessionManager: Playback stopped reported by app "Jellyfin Web" "10.10.7" playing "Period One: The Appalling Mr Gormsby". Stopped at "0" ms
[2025-10-04 12:54:27.539 +00:00] [INF] [4] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: Playback stop tracker found, processing stop : "TW96aWxsYS81LjAgKFdpbmRvd3MgTlQgMTAuMDsgV2luNjQ7IHg2NDsgcnY6MTQzLjApIEdlY2tvLzIwMTAwMTAxIEZpcmVmb3gvMTQzLjB8MTc1OTU4MjQ0NDU5OQ11-3976af52a3ba47c9b2075c9b94d3da5b-66f1494bf1a93a4448f072f6727cf122"
[2025-10-04 12:54:27.540 +00:00] [INF] [4] Jellyfin.Plugin.PlaybackReporting.Data.PlaybackTracker: PlaybackTracker : Adding Stop Event : 10/04/2025 12:54:27
[2025-10-04 12:54:27.540 +00:00] [INF] [4] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: Playback stop but TrackedPlaybackInfo not found! not storing activity in DB
[2025-10-04 12:54:45.511 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: session.RemoteEndPoint : "192.168.1.243"
[2025-10-04 12:54:45.511 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : event_playing_id    = "66f1494bf1a93a4448f072f6727cf122"
[2025-10-04 12:54:45.512 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : event_user_id        = "3976af52a3ba47c9b2075c9b94d3da5b"
[2025-10-04 12:54:45.512 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : event_user_id_int    = 1
[2025-10-04 12:54:45.512 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : session_playing_id  = ""
[2025-10-04 12:54:45.512 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : session_user_id      = "3976af52a3ba47c9b2075c9b94d3da5b"
[2025-10-04 12:54:45.513 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : play_method          = "na"
[2025-10-04 12:54:45.513 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : e.ClientName        = "Jellyfin Web"
[2025-10-04 12:54:45.513 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : e.DeviceName        = "Firefox"
[2025-10-04 12:54:45.513 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : ItemName            = "Seven Periods With Mr. Gormsby - s01e01 - Period One: The Appalling Mr Gormsby"
[2025-10-04 12:54:45.513 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : ItemId              = "66f1494bf1a93a4448f072f6727cf122"
[2025-10-04 12:54:45.514 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : ItemType            = "Episode"
[2025-10-04 12:54:45.514 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : Details do not match for play item
[2025-10-04 12:54:45.514 +00:00] [INF] [18] Jellyfin.Plugin.PlaybackReporting.EventMonitorEntryPoint: StartPlaybackTimer : Exited

Any help would be welcomed as this is my first time doing any of this im a windows user only with no code or anything of the like experience!

Thanks