SOLVED: Jellyfin client stuttering and playing at slow speed

[etiennec78]

Hello !
I've been using jellyfin for quite some time and this is a wonderful software !
However, I can't find a way to make the client work on my laptop.
When I try to play a video, everythings runs on low framerate and the movie is slowed down (1 sec = ~3 sec), even if I try to change the playback speed.
I noticed a lot of "[critical] unknown @ 0 - ffmpeg: NULL: non-existing PPS 0 referenced" in my client's logs so I think this could be related.
If I select a lower bitrate than the file already is, my raspberry transcodes it and everything plays well !
I thought this had a link with my HEVC files, but it does the same with AVC.
All of my other devices work fine. I also tried playng the movie on the same laptop with samba + VLC and it worked nicely.

Does anybody know what could cause this issue on my linux laptop ?
Thanks for reading !

Logs : https://pastebin.com/3eHnNmpZ

Useful information :
[CLIENT]
Player : jellyfin-media-player-1.9.1
Processor : Intel Celeron N4120
System : (Arch) Linux
Type of connection : wifi 5 (3 meters away), over LAN

[SERVER]
Hardware : Raspberry Pi 4 2GB
System : Raspberry OS
Jellyfin version : 10.8.11
Platform : debian repository
Type of connection : ethernet
File codecs : HEVC or AVC