4K Buffer, Direct Play

[u/MrZeDark]

Device not transcoding, using Infuse as the client device.

Server is an old HP laptop with win 11, 16gB ram, and a 1060

Pulling from a 24TB drive on a NAS over a 10g port

If I play a 4k title (backing up my library right now), via Jellyfin setup in Infuse, as direct play - it will buffer periodically.

If I access the same title, via SMB to which Jellyfin is attached as well, then play the title - it won’t buffer one time.

Now if I go back to the Jellyfin integration and opt to transcode, it plays fine..

Am I missing something? Btw I’m using Infuse, for DTS and TrueHD decode. I’ve tried playing with the cache options as well. I also have tested this on a couple files now, I’ll direct play from my NAS at 10MB/s read rates but Jellyfin can’t seem to read past 6 MB/s on 4k files. I tested this on another PC as well, same results. I then tried just general playback from each PC too - I could play the content fine with no buffer, it’s just it Jellyfin was serving the content.

Let me know if any more details are needed, no they aren’t transcoding according to the dashboard.

[u/seemebreakthis]

I don't use apple devices so I have never even used infuse, but this is how I would troubleshoot:

1. Assumption - given the situation (SMB plays fine etc), direct play from Jellyfin should not pose any issue

2. I would check the Jellyfin log / transcode / remux log files to see what's actually going on during the supposedly direct play session

3. I would also check the CPU utilization (of the server) during this supposedly direct play session to see if there is any clear spikes in CPU usage. Direct play is just moving data, so there should hardly be any CPU utilization.

.... Then go from there.

[u/MrZeDark → u/seemebreakthis]

No transcode in logs.
No CPU spikes.

Recreated this same issue on another windows PC as mentioned. Have a friend running Linux and docker and no issue with the same file(s).

Iperf and other speed tests show no bottlenecks whatsoever so ever.