Server Version#: 4.6.2
Hi, i’m new on the plex platform, i’ve recently build a server based on windows server 2019, all works just fine, but when i try to play a 4k film and do a conversion to it the cpu can’t keep on and the video on the client buffer, but the problem is that the cpu during the transcoding processis only at 30/40% so is not use all… i’ve purchased the plex pass to use the hw acceleration. I hope that we can resolve this problem, thanks.
Riccardo.
Does the file use the VC-1 video codec? That codec is limited to transcoding with a single core.
I don’t know what that is and i also don’t know how to check it
Look at this guide, https://support.plex.tv/articles/201998867-investigate-media-information-and-formats/.
Media
Durata 2:21:18
Bitrate 10412 kbps
Width 3840
Height 1604
Aspect Ratio 2.35
Video Resolution 4K
Container MKV
Video Frame Rate 24p
Video Profile main 10
Titolo Originale
Parte
Durata 2:21:18
File Avengers Age of Ultron - 2015 4K HDR x265.mkv
Size 10.28 GB
Container MKV
Video Profile main 10
Codec HEVC
Bitrate 9580 kbps
Bit Depth 10
Chroma Subsampling 4:2:0
Color Primaries bt2020
Color Range tv
Color Space bt2020nc
Color Trc smpte2084
Frame Rate 23.976 fps
Height 1604
Livello 5.1
Profile main 10
Ref Frames 1
Titolo
Width 3840
Display Title 4K (HEVC Main 10 HDR)
Codec AC3
Canali 6
Bitrate 448 kbps
Lingua Italiano
Audio Channel Layout 5.1(side)
Sampling Rate 48000 Hz
Display Title Italiano (AC3 5.1)
Codec AC3
Canali 6
Bitrate 384 kbps
Lingua English
Audio Channel Layout 5.1(side)
Sampling Rate 48000 Hz
Display Title English (AC3 5.1)
Codec SRT
Lingua English
Display Title English (SRT)
Codec SRT
Lingua Italiano
Display Title Italiano (SRT)
An example of file is this…
Ok, so you have HEVC video. Transcoding requires 2 parts, a decoder and encoder. Depending on your hardware, one of these may not support HEVC, so it has to use part of the CPU. I’ll need the log from your server after trying to stream this file to know more.
please carefully read the entire thread @ Plex, 4k, transcoding, and you - aka the rules of 4k - a FAQ
ok, when i come back home i will provide the log, i’ve to startup the debugger mode? restart the server and provide the log?
Also my setup is a Mobo whit embedded cpu that an handle 4k transocding that is this, 8gb of DDR4 ram, no GPU and an SSD for the O.S., all my media file are stored in a NAS, a QNAP TS-128 that is connected whit a gigabit switch to the rest of the network whit CAT5E cable.
The CPU on that is very low powered. PassMark - Intel Celeron J4105 @ 1.50GHz - Price performance comparison. It’s barely enough to handle 1080p video. I seriously doubt you can get good transcoding results of 4K video with that.
It supports 4K video. That is not the same as transcoding.
I don’t think your cpu supports QuickSync, which is needed. Intel Celeron J4105 Processor 4M Cache up to 2.50 GHz Product Specifications
I’ve choose this motherboard (the ASRock j4105) because an user on another forum purchased this particular one and made his server by this, and by his told he can handle 3 4k transcoding simultaneously… I was very sceptical about this…
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