Jellyfin not playing the occasional media file

[Atileture77]

First, lets turn on hardware acceleration.

Select Intel Quick Sync from the drop down.

Check these boxes
*****
H264
HEVC
MPEG2
VC1
VP8
VP9
HEVC 10-bit
VP9 10-bit

Enabled Hardware Encoding
Allow Encoding in HEVC Format
Enable VPP Tone Mapping
Enable Tone Mapping
******
Save

What happens now when you play one of these problem videos?

Turned the above on.
Tried playing through Jellyfin Media Player, still no dice:

[2023-08-09 10:43:36.637 -07:00] [INF] [11] Emby.Server.Implementations.HttpServer.WebSocketManager: WS "172.29.0.1" request
[2023-08-09 10:43:46.659 -07:00] [INF] [25] Emby.Server.Implementations.HttpServer.WebSocketManager: WS "172.29.0.1" request
[2023-08-09 10:43:49.627 -07:00] [INF] [11] Jellyfin.Api.Helpers.MediaInfoHelper: User policy for "cbs". EnablePlaybackRemuxing: True EnableVideoPlaybackTranscoding: True EnableAudioPlaybackTranscoding: True
[2023-08-09 10:43:49.696 -07:00] [INF] [11] Jellyfin.Api.Helpers.MediaInfoHelper: StreamBuilder.BuildVideoItem( Profile="Jellyfin Media Player", Path="/data/movies/movies-all/Nefarious (2023)/Nefarious (2023).mkv", AudioStreamIndex=null, SubtitleStreamIndex=null ) => ( PlayMethod=DirectPlay, TranscodeReason=0 ) "mediavideos/6418ffc1-f985-274c-af16-500a36e9a753/stream.mkv?MediaSourceId=6418ffc1f985274caf16500a36e9a753&Static=true&VideoCodec=h264&AudioCodec=ac3&AudioStreamIndex=1&api_key=<token>&SubtitleMethod=Encode&Tag=a52e1127be73888b7a36412567b35040"
[2023-08-09 10:44:24.923 -07:00] [INF] [29] Emby.Server.Implementations.Session.SessionWebSocketListener: Sending ForceKeepAlive message to 1 inactive WebSockets.
[2023-08-09 10:44:36.925 -07:00] [INF] [27] Emby.Server.Implementations.Session.SessionWebSocketListener: Lost 1 WebSockets.
[2023-08-09 10:44:55.670 -07:00] [INF] [30] Emby.Server.Implementations.HttpServer.WebSocketManager: WS "172.29.0.1" closed
[2023-08-09 10:45:01.966 -07:00] [INF] [36] Emby.Server.Implementations.HttpServer.WebSocketManager: WS "172.29.0.1" request
[2023-08-09 10:45:04.181 -07:00] [INF] [38] Emby.Server.Implementations.HttpServer.WebSocketManager: WS "172.29.0.1" closed