HVEC 10bit. with DS918+

Plex Media Server NAS & Devices
1

Hi,
I have the DS918+ NAS with 8GB of Ram. My Plex is running on that NAS.
Hardware Acceleration is turned on under Settings->Transcoder.
I try to play (Client is a Chrome under a Winows system with GTX 1060) a movie file with the following data:

Codec HEVC
Bitrate 76366 kbps
Bit Depth 10
Chroma Subsampling 4:2:0
Color Range tv
Color Space bt2020nc
Frame Rate 23.976 fps
Height 2160
Level 5.1
Profile main 10
Ref Frames 1
Width 3840

Codec DCA
Kanäle 5.1
Bitrate 1536 kbps
Sprache Deutsch
Audio Channel Layout 5.1(side)
Bit Depth 16
Profile ma
Sampling Rate 48000 Hz

Codec TRUEHD
Kanäle 7.1
Bitrate 3854 kbps
Sprache English
Audio Channel Layout 7.1
Bit Depth 24
Sampling Rate 48000 Hz

Codec AC3
Kanäle 5.1
Bitrate 640 kbps
Sprache English
Audio Channel Layout 5.1(side)
Sampling Rate 48000 Hz

Erzwungen true
Codec SRT
Sprache Deutsch
Titel forced

Codec VOBSUB
Sprache Deutsch
Header Compression true
Titel complete

Codec PGS
Bitrate 41 kbps
Sprache English
Header Compression true
Titel complete

But I just see the loading icon (On the default Maximum quality setting).
If I change in the movie playback to “Convert (20Mbps, 1080p HD)”, it runs smooth as silk.
Is there somehow a way to watch it in 4K?

I thought that this NAS is able ;(

Kind regards

2

It is not a NAS issue with exception of the GPU in the NAS does not support encoding 4K.
It will decode 4K and encode to 1080p fine

The CPU would need a KabyLake or GeminiLake GPU to accomplish this. It has the ApolloLake GPU.

Additionally, Plex will not transcode to any 4K (SDR or HDR) resolution.

3

That’s …, I just bought that NAS for exact that one reason! ;(
Is there even a NAS on the market with which I can watch a movie like the above over Plex in 4K (with HDR would be optional)?

4

If you want to encode to 4K, you need an i7-7xxx or better CPU (KabyLake -7xxx or GeminiLake -8xxx)

Next: Plex does not encode to 4K targets. What’s the point? If your player is native 4K, what are you processing it for?

Kindly refer to https://support.plex.tv/articles/201373803-nas-compatibility-list and review the NAS Compatiblity List

Edit: Synology NAS products do not have strong CPUs. A QNAP with an i7-7xxx CPU will do the hardware transcoding and the subtitle work you need. I recommend you review the threads in the QNAP forum. Please ask questions… They are a very helpful group

5

@“zusammen@f-nepal.de” said:
That’s …, I just bought that NAS for exact that one reason! ;(
Is there even a NAS on the market with which I can watch a movie like the above over Plex in 4K (with HDR would be optional)?

I wish to make clear:

A Synology NAS, such as your DS918+, will play 4K HEVC and transcode it to 1080p without difficulty depending on the type of subtitles.

In the metadata you show above,

  1. SRT subtitles are Text based. These can be streamed along with the audio & video.
  2. VOBSUB and PGS subtitles are images. These must be merged into the transcoded video stream by the CPU

If you turn off subtitles, does the everything play as expected, transcoding from 4K HEVC to 1080p H.264?

6

@“zusammen@f-nepal.de” said:
That’s …, I just bought that NAS for exact that one reason! ;(
Is there even a NAS on the market with which I can watch a movie like the above over Plex in 4K (with HDR would be optional)?

I think you mean decoding (not encoding)

7

Ich glaube auch, aber wir müssen uns sicher sein