Large files & remuxes buffer while streaming in the same network

[DazzlingTap2]

Since Sash directed me in this thread I'll post my findings here. I've already talked with him in private and resolve some problems (checking MPV shim logs and attempt to disable transcoding).

What SSD you currently have? Unless it's a crap one you shouldn't have issues with longevity. I now run all of my Windows OS and program on a single SSD. DreadedPirate provided help already on where to change location for Jellyfin server, I think for Shim and etlp, these are lightweight player/backend software that simply process web requests and open shell commands, not a lot of IO is happening.

Can anyone confirm that DoVi files that aren't HDR10 compatible have issues during playback?

No issues using MPV Shim and external MPV, colors look correct, pictures are bright and monitor enters HDR. Sometimes with funky HDR in windows it's bug out, but nothing like the stuttering issues what you described.

Can someone confirm that Jellyfin transcodes when the resolution is mismatched? I have a 2k monitor, and I'm playing 4K videos, but my gpu should be able to handle it and not stutter because these files work perfectly when I play the directly on MPV player. Btw, I have attached entire log of MPV Shim with this post.

No, that should not be the case. I have a 2560x1440p monitor also with HDR, when I playback any 4K remux DV or HDR regardless of size, I open it in web browser and chose MPV Shim as cast client, playback is smooth and monitor enters HDR mode. So I don't know why your jellyfin does that. Maybe you can try fully disable transcoding, create a user that have no transcode privilege and sign in to Shim with that instead.

4. When I disable tone mapping and play the videos on MPV Shim, embyToLocalPlayer MPV, or Jellyfin web then the colors are washed out. The colors don't get washed out if I play it on Jellyfin Media Player even when the tone mapping is disabled. Does anyone have any idea why this happens? My display is HDR enbaled so I feel like the HDR should passthrough without tone mapping being on.

Makes sense why Jellyfin Web is washed out, but etlp and Shim should not because these tools are just spawning MPV instances to playback so all that your MPV supports should be supported by these tools. Try launching mpv from your terminal with some files to see if the conf's are still working. In the mean time, in your picture PotPlayer also has correct HDR, so you can try using Pot with etlp and see if that works.