As I mentioned before, tone mapping is only partially supported in hardware on Windows, so you will see slower performance there. You can try and see if you get a better experience with QS rather than the Nvidia card, but I don’t know off the top of my head what the difference would be. If you disabled tone mapping, how does it perform?
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I am running Windows 10 Home on an i7-8700K, with Nvidia 1070 Ti, and with both of the hardware-related options checked in the “Transcoder” section, I can report that Plex transcoding of 4K videos down to 1080p was NOT performant enough to even watch. BUT when I removed the Nvidia 1070 Ti card, the situation is much improved, and now the transcoding is performant enough to watch, proving that QuickSync does a wonderful job when fully enabled.
Was HDR tone mapping involved?
Yes, HDR tone mapping was enabled for my tests.
Not sure how to engage you on a new topic,so feel free to move this to a different topic.
Currently using Synology 1019 with 4k hardware transcoding. I can stream 4k Atmos 7.1 directly from the synology to my LG tv. Then take the optical audio out from the tv into Marantz receiver. This all works no issues. What I don’t understand is why do these 4k titles not show up in plex at all.
Isn’t the Atmos 7.1 signal lost/downgraded via optical? As far as i know, only 5.1 DTS and Dolby is supported there.
I guess I can’t be positive, but the receiver supports Atmos, and it’s display says Atmos, but I guess I can’t be certain that all 7 channels are independent.
You cannot pass Atmos audio over optical/coax audio cables
LG does not license the TrueHD audio codec, therefore the Plex LG app cannot direct play such audio. If you use the Plex LG app to play a TrueHD or TrueHD + Atmos audio track, Plex will transcode the audio to a supported format. Atmos information is lost during the transcode.
“Streaming Atmos” used by Netflix, et al, is Dolby Digital Plus + Atmos. This is licensed by LG and can be direct played by the LG Plex app. However, optical audio does not support Dolby Digital Plus audio (nor TrueHD or dts-HD).
An optical audio connection is limited to PCM 2.0, Dolby Digital 5.1, and dts 5.1.
If you have movies not appearing in your Plex libraries, you should open up a separate thread. Tag it with “server-synology” since that is where you are running Plex Media Server.
To open a new thread, start at the main forum page, forums.plex.tv. Select a category, such as Plex Media Server, then click on “New Topic” at the top of the page.
So i have a hardwired shield pro, gigabit hardwired pc that tests at 900mbs, and struggle to play 4k on Friday nights for some reason. It is direct play
The hard drive is a usb 3.0 external, what is the problem here? Any other night/day it seems to work well is it the sheer traffic om Friday night?
This is not a troubleshooting thread.
Please open a new thread, provide all details including client and server versions and hardware, what tv/avr/sound bar you have and how they are plugged into each other, what does the plex server dashboard show, and logs.
Will the Intel UHD 750 be able to transcode properly from day one?
Looking to buy an i5-11500 the 30th of march for a new server build.
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I doubt anyone will know until it is out and can be used.
It’s possible it requires a newer/different driver, or maybe it can use the existing, who knows… 
Okay. I might hold on another 2 weeks to make sure then.
I do think a good handful of retail 11700k and 11600k is already out there. This launch has been weird.
Keep us posted, or shoot me a message on how that works when you get it! I couldn’t wait and pulled the trigger the other week on an i9-10980XE to replace my decade old Plex server that ran 24/7. Needed 4k now and that HW was not up to the task. Thanks!
Why does playing 4k video using VLC just work and yet my Plex does not even show 4k mkvs.
Big news for anyone following this thread.
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I’ve been doing some experimenting recently with 4k transcode and tonemapping,
What I discovered is doing something poorly. here is my setup:
CPU: Intel(R) Core™ i3-4130 CPU @ 3.40GHz, 2569 MHz
16GB DDR3
Quadro P620
OS: Linux Mint
It’s a fairly old machine but I’ve been able to use it for my plex and jellyfin testing
So, with Hardware encoding and tonemapping enabled on both jellyfin and plex I ended up with two completely different results.
For Plex I never saw the GPU get higher than 35% usage and watching a movie was completely impossilbe
On Jellyfin side, using nvidia nvenc and Hable Tone mapping algo (using FFmpeg but I’m not totally sure it’s using it in that specific situation), I saw the gpu getting at 97% utilization and letting the thing buffer for about 10-15 seconds I was actually able to watch a 10min clip without any more buffering issues.
that probably mean that if I’d upgrade my graphic card for a p2000 or something just a bit stronger, there is a good chance I could watch 4k transcoded movide using jellyfin but plex would still bottleneck somewhere. I’m not totally sure what is the difference in the tonemapping algo in plex and jellyfin are but maybe there is something to dig there.
– update –
I decided to give a shot on windows and using another machine (way recent one)
pretty much same result as for plex making it impossible to have something fluid.
Setup:
cpu: i7-9850h
32 gb ram ddr4
Quadro rtx 5000
jellyfin with nvnenc enabled and tone maping set to the nvidia card was using about 43% of the card, near nothing in buffering, clearly its usuable. Something I noticed tho, if the tone map was set to the default values in opencl configs it was lagging behind, trying to mostly use the integrated UHD 630 graphic card.
si my conclusion is that it’s really plex that is the bottleneck here. the rules of not transcoding 4k are being invalid with more recent nvidia cards and it would clearly be possible to do. Maybe plex devs need to give a little more flexibility on the transcoding settings so that we can use ffmpeg and forcing nvenc encoders.
–update 2021-04-26–
I finally received my P2000. I was suprised to see that it wasnt making a huge difference for 4k transcode in Jellyfin and Plex…at first! With a bit of thinkering this time I was able to have a better result with Plex in fact. At first, results were identical and it was pretty much impossible to have a full transcode on plex going. it was lagging behind all the time.
I did abit of research and found out that it was possible to force the GPU you wanted to be used in the Preferences.xml. I added the path to my new GPU in the HardwareDevicePath variable and VOILÀ! I was able to transcode 4 streams without any issues and the GPU utilization was around 70%
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I am running Windows 10 x64 with an i7-8700k CPU, 32GB ram and a Nvidia GTX 1660 Super and have transcoded everything and anything I’ve thrown at it no problems. The highest bitrate movie I have which is “Fury” at 123.8 Mbps plays basically instantly when I force it to transcode remotely. I’ve gotten upto somehwere around 14-15 transcodes/streams if I remember correctly with no issues at all. Sure I paid ~$225 for the card (last spring) but it’s been worth every penny and works flawlessly (after unlocking the 2 stream limitation). Should people running PMS on a NAS try to transcode 4k? Probably not so much but anyone with an actual computer running it that will spend a few dollars on the right hardware its a non-issue. Would love to see content transcoded into H265/HEVC for remote streaming TBH as that would help with my ~40Mbps comcast upload speed limitation.
Where? LOL
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