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Plex remote access - low quality even with gigabit fiber (self.selfhosted)

submitted 4 months ago* (last edited 3 months ago) by triptrapper to c/selfhosted

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Hey all, I'm very new to self-hosting and have no background in anything computer-related. I'll explain in as much detail as I can. I'm running Plex on a Synology DS220+. I'm using the Plex app, i.e. not using Docker (see note below).

The issue: I can watch Plex on my local network in 4K, but outside my local network it barely makes it to 720p. I thought it was an issue with my upload speed, but I got gigabit last week and it hasn't fixed the issue. I have remote access enabled in Plex through a manually-specified port. The issue persists with my own account and any friends who have access to my library.

I appreciate any advice, links or questions you can offer!

NOTE: I understand the benefits of Docker and I promise to transition in the future. I spent many hours learning and troubleshooting, and it was even functional at times, but eventually I needed something that just worked.

EDIT: You all have been so helpful and supportive. Thanks for meeting me where I'm at and sharing some potential issues.

EDIT2: I found the culprit by accident. I had UPnP enabled on my router. I turned it off and my local speeds increased significantly, and my Plex library is available remotely. I don't know how or why UPnP is related, but that's what the solution was for me. Thanks again for all your input and support.

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[–] i_am_tired_boss 10 points 4 months ago* (last edited 4 months ago)

Even if the port is open, Plex can sometimes use the relay server. You might want to explicitly disable that.

Also, you can check if the video is being transcoded on-the-fly by going to quality settings and seeing if it's showing up as transcoded or directplay. Sometimes you might have to force the directplay on your client device (Playback might fail if your device doesn't support the specific format).