TVS-873 plex transcoding 4k lagging

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alaska99
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TVS-873 plex transcoding 4k lagging

Postby alaska99 » Sun Aug 12, 2018 8:03 am

Hi,
Yesterday I try play a 4k HEVC video with Plex on my apple TV 4. I can see that Plex is transcoding the video in the status page but the video play somes secondes then lag...
I have 20 Gig of RAM and added a SSD cache 860EVO 500Gb in my NAS.
I try too with Emby player and same lag...

I'm a very disappointed to see that my NAS can not play effectively video in 4K :(

Someone can help me how play 4k video with my NAS? Should I add more RAM? Add a second SSD cache? Can I add a more powerfull PCI video card in my NAS and use it to transcode? Or my CPU is just too weak and nothing to do?

Thank for your help
TVS-873 with 6 disk HGST of 8TB 7200RPM
Samsung SSD 860EVO 500 Gb cache
20Gb RAM

dolbyman
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Re: TVS-873 plex transcoding 4k lagging

Postby dolbyman » Sun Aug 12, 2018 12:37 pm

you can throw more ram or faster drives/cache at it all you want, your cpu is probably too weak (check cpu usage while transcoding)

serve it via dlna or smb and it should work just fine

my old 419p+ serves 4k hdr via twonky dlna just fine

gggplaya
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Re: TVS-873 plex transcoding 4k lagging

Postby gggplaya » Mon Aug 13, 2018 10:44 am

Do you have an Apple TV 4, or Apple TV 4k???? The ATV4 only has 100mbps ethernet connector and doesn't have h.265 hardware decoding. So it won't direct play and 4k h.264 is probably a huge file.

I have an apple tv 4k, and if you use the Infuse app (https://firecore.com/) it will direct play every 4k video from the Plex server using h.265 hardware decoding and it has the full paid audio licenses as well.

Also, your NAS is not the Ryzen model, it's a much lower end AMD processor. Way to slow to transcode 4k video.

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Moogle Stiltzkin
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Re: TVS-873 plex transcoding 4k lagging

Postby Moogle Stiltzkin » Mon Aug 13, 2018 11:28 am

robbie ran a 4k test for it here if you're interested in checking out
https://nascompares.com/plex/qnap-tvs-4 ... -4k-1080p/


compare that to the ts-877 series
https://nascompares.com/2018/08/12/qnap ... and-h-265/
Last edited by Moogle Stiltzkin on Mon Aug 13, 2018 11:33 am, edited 1 time in total.
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Trexx
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Re: TVS-873 plex transcoding 4k lagging

Postby Trexx » Mon Aug 13, 2018 11:30 am

Cpu isn't beefy enough to handle 4k real-time transcoding in the x73 family. Either go with something like the inFuse app or something like the Nvidia Shield TV which can play about anything 4k or otherwise.
Paul

Model: TS-877-1600 FW: 4.3.4.0644
QTier (HDD): [RAID-5] 6 x 3TB HGST DeskStar NAS QTier (SSD): [RAID-1] 2 x 525GB Crucial MX300 m.2's
(SSD): [RAID-1] 2 x 240GB Inland Pro's
RAM: Kingston HyperX Fury 32GB Kit DDR4-2666
GPU: EVGA GTX 1060, ACX 2.0(1 Fan), 6GB
UPS: CyberPower AVR1350 Ext. Backup: USB 3.0 Seagate 5TB
Media Boxes: Nvidia ShieldTV Pro, AppleTV 4, Roku Stick

Model: TVS-673 32GB FW: 4.3.4.x Test Box
-----------------------------------------------------------------------------------------------------------------------------------------
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gggplaya
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Re: TVS-873 plex transcoding 4k lagging

Postby gggplaya » Mon Aug 13, 2018 12:57 pm

Moogle Stiltzkin wrote:robbie ran a 4k test for it here if you're interested in checking out
https://nascompares.com/plex/qnap-tvs-4 ... -4k-1080p/


compare that to the ts-877 series
https://nascompares.com/2018/08/12/qnap ... and-h-265/


You can see that in that test, he was pushing 12.3MB/s which is basically 98.4mbps at 100% efficiency with no networking overhead. Like I said before, the ATV4 only has a 100mbps ethernet connector, it wasn't designed for 4K if that's what you're using.

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Re: TVS-873 plex transcoding 4k lagging

Postby Trexx » Mon Aug 13, 2018 11:05 pm

Nowhere did OP state he was having a NW issue.

OP - If you are transcoding from 4k HEVC, the CPU is likely maxing out near 100% as it will have to transcode to 1080p via SW. At roughtly 4800 passmarks, it is just not beefy enough to handle that for most things. Since your file will likely have variable bitrate encoding, there maybe parts where it can keep up transcoding real-time and other part where it can't.

Option 1) go with inFuse and move the transcoding onto the ATV where it can likely take advantage of the GPU/etc. to transcode. Cheapest/easiest option. Plus latest inFuse Pro can now integrate with Plex library so that helps keep your playback status/etc. in sync.

Option 2) go native 4k compatible playback device (ATV 4k, Nvidia Shield TV, etc). One advantage of NVidia ShieldTV is you also get a free Plex Server w/HW Transcoding support with it. You can still leverage the QNAP for the backend storage for it.

Option 3) Pre-transcode file to 1080p via Plex or other tool such as Handbrake - Free option other than lost diskspace.

Option 4) Get beefier NAS or model that supports 4k HW transcoding - Most expensive option.
Paul

Model: TS-877-1600 FW: 4.3.4.0644
QTier (HDD): [RAID-5] 6 x 3TB HGST DeskStar NAS QTier (SSD): [RAID-1] 2 x 525GB Crucial MX300 m.2's
(SSD): [RAID-1] 2 x 240GB Inland Pro's
RAM: Kingston HyperX Fury 32GB Kit DDR4-2666
GPU: EVGA GTX 1060, ACX 2.0(1 Fan), 6GB
UPS: CyberPower AVR1350 Ext. Backup: USB 3.0 Seagate 5TB
Media Boxes: Nvidia ShieldTV Pro, AppleTV 4, Roku Stick

Model: TVS-673 32GB FW: 4.3.4.x Test Box
-----------------------------------------------------------------------------------------------------------------------------------------
NAS RAID Rebuild Times | Live QTS Videos | | QNAP NAS Guide | Information needed when you ask for HELP | QNAP Links, Tutorials, etc.
2018 Plex NAS Compatibility Guide | QNAP Plex FAQ | Moogle's QNAP Faq


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