SOLVED: Jellyfin buffering... is my hardware acceleration working?

[RitzyMage]

I'm wondering if your local traffic is not staying local.  Does your router support NAT loopback/hairpin?  Enabling them would keep local traffic from going out to the Internet and coming back.

It's definitely possible; my router should have NAT capabilities according to the docs, but I don't see anything in the settings.

For your remote clients, how fast is your home Internet connection? 

My internet where the server is is a gigabit ethernet connection. Some remote clients have been using a slow connection, which is one reason why I want to get this working.

I've been testing a slower connection using a VPN, but even that is getting ~650 Mbps.

And can you provide the media info for some of your problem videos?

Attached a screenshot. My original post also had the output of ffprobe if you want that information.

Code:

Container: mp4
Path: /media/....mp4
Size: 148 MB

Video
Title: 1080p H264 SDR
Codec: H264
Codec tag: avc1
AVC: Yes
Profile: Main
Level: 40
Resolution: 1920x1080
Aspect ratio: 16:9
Interlaced: No
Framerate: 23.976025
Bitrate: 1722 kbps
Bit depth: 8 bit
Video range: SDR
Video range type: SDR
Color space: bt709
Color transfer: bt709
Color primaries: bt709
Pixel format: yuv420p
Ref frames: 1
NAL: 4

Audio
Title: Original - English - AAC - Stereo - Default
Language: eng
Codec: AAC
Codec tag: mp4a
Profile: LC
Layout: stereo
Channels: 2 ch
Bitrate: 162 kbps
Sample rate: 48000 Hz
Video range: Unknown
Video range type: Unknown
Default: Yes
Forced: No
External: No

Also, I just upgraded my Linux kernel version, so I'll see if that helps later today.