4K/Transcoding...

[RogerT]

I recently purchased a new 4k TV and thus started looking at adding 4K content. 
I run a Jellyfin Ubuntu server that works wonderful!
I installed Jellyfin on the TV and it works great also!

I tried to watch a 4K on Jellyfin on the TV and it was BAD, yes It was a transcoding issue, the server was stating it was transcoding due to incompatible format for the TV.  I then used the TV app to access the movie via the DLNA server installed on the same machine and the 4K video played great!! so the TV is compatible with the video format that was stored and was able to play it raw! 

My question is, why did Jellyfin on the server even try to transcode and not just send the file raw like it does for almost all my other files?  I do not have hardware transcoding enabled (might look at an upgrade later), so it was attempting software transcoding.

[TheDreadPirate]

What are your hardware specs, version of Ubuntu, is the video HDR, were you using image based subtitles?

[RogerT]

Although the video plays fine with no issues using a raw transfer, it fails using Jellyfin as Jellyfin thinks it needs to be transcoded when it really doesn't.

Iam going to look at hardware transcoding in a future upgrade but currently have hardware transcoding disabled but currently I am curious why Jellyfin thinks it needs to be transcoded when it really doesn't.

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Jellyfin 10.9.9
Ubuntu 22.0.4
Intel® Core™ i5-4670 CPU @ 3.40GHz, 4 cores
8GB RAM
Western Digital 2 TB WD AV-GP SATA III Intellipower 64 MB Cache
Storage
28TB (Raided Seagate IronWolf ST6000VN001 6 TB Hard Drives)

[TheDreadPirate]

It depends on what kind of HDR it is. Can you share the media info for the video?