4k playback interrupts frequently in web player

Plex Players Desktop Players
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Server Version#: 1.41.5.9522
Player Version#: 4.145.1

Hi Community,

I have added a 4K video to my server and it plays absolutely fine when played on

  • 4K TV with roku 4K stick (wlan)
  • HD TV with roku streaming player (wlan)

It does not play fine when accessing the video from plex in my web browser (firefox) on my desktop pc, connected via 1gbit lan to my qnap nas, where plex is running.
It takes a very long time before the video starts, then plays a couple of seconds before it interrupts again and so on…

I have noticed that the CPU load on the NAS jumps to 100% and transcoding processes start running. The cpu load stays at ~30% when playing the video from the roku devices.

Is there something misconfigured?
Or why is the server transcoding the video for the web player?
I tried disabling transcoding in the settings, but then the video won’t play at all in the web player.

Thank you very much for your support :slight_smile:

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You will have a better experience overall if you use the Plex App for Windows than a browser.

That being said your NAS is most likely does not have the proper CPU to transcode 4K to 1080p (I’m assuming some things here since you didn’t list which NAS or monitor you’re using).

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Thank you very much for your reply :slight_smile:

I wasn’t aware that there is a plex app - I never searched for something like that, as its use-case doesn’t really make sense to me, given the existence of the comfortable and univerally usable plex web.

In fact, the plex app can play the videos flawlessly.

My NAS is a QNAP TS-264 and my monitor is 1440p viewsonic monitor.

It still seems strange to me that the plex web can’t - is it maybe a bug?
I mean, why can’t it just stream the 4k video and the playing device downscales the frames to the monitors resolution, which is a much simpler calculation.
Transcoding, in my opinion, only makes sense if there is limited bandwith available, which isn’t the case in my local LAN.

4

Glad it’s working out for you.

FYI there is a Plex NAS Compatibility list to see what NAS’s are capable of.

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Thanks for the hint :slight_smile:

It seems my NAS is supported, but if I understand that page correctly,
it will require hardware accelerated transoding, which itself requires

  • a plex pass and
  • the installation of a nvidia GPU

Rather expensive modifications to workaround a bug or strange technical limitation.

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Just a Plex pass. The N5095 (which has quick sync) can do hardware transcoding.

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ALL:

I’m waiting for help from QNAP so I can update the NAS Compatibility Guide.

If ANYONE has questions about something not listed, PLEASE ask me.

All the new QNAP products should work fine. The unknown will be whether or not HW transcoding or external GPU is available/supported.

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