Whenever I put on a 4K HDR movie, or even a 1080p SDR movie, if HW acceleration is on (I achieve this with a 1080Ti, passed through proxmox on a Dell R720, with 2xE5-2650v2. With CPU tone-mapping there’s no problem, but as soon as I turn on HW transcoding, video plays back for a minute, then it start stuttering, then video stops but audio keeps going on, and ultimately the server crashes. CUDA is downloaded correctly and I have 535 driver for the Nvidia GPU. Ubuntu is 20.04.
@ChuckPa It does, it appears as Plex Transcode Job, ca. 400MB of NVRAM used. Then it goes to near zero and then it exits when Plex tells it to (i don’t know why PMS thinks client is exiting). Other times Plex for Mac/iOS just says “Couldn’t start playback session for this item.”
Normal SMI:
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 535.183.01 Driver Version: 535.183.01 CUDA Version: 12.2 |
|-----------------------------------------+----------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+======================+======================|
| 0 NVIDIA GeForce GTX 1080 Ti Off | 00000000:01:00.0 Off | N/A |
| 0% 32C P8 17W / 250W | 12MiB / 11264MiB | 0% Default |
| | | N/A |
+-----------------------------------------+----------------------+----------------------+
+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 8606 G /usr/lib/xorg/Xorg 9MiB |
+---------------------------------------------------------------------------------------+
Plex Starts Transcoding:
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 535.183.01 Driver Version: 535.183.01 CUDA Version: 12.2 |
|-----------------------------------------+----------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+======================+======================|
| 0 NVIDIA GeForce GTX 1080 Ti Off | 00000000:01:00.0 Off | N/A |
| 0% 34C P0 60W / 250W | 138MiB / 11264MiB | 0% Default |
| | | N/A |
+-----------------------------------------+----------------------+----------------------+
+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 8606 G /usr/lib/xorg/Xorg 9MiB |
| 0 N/A N/A 1155545 C ...b/plexmediaserver/Plex Media Server 124MiB |
+---------------------------------------------------------------------------------------+
In this case Plex for Mac showed this error without starting playback: An unknown error occurred (4294967283) Error code: 4294967283
But then started working again by clicking on retry. (HD1080 H264 → SD 4mbps)
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 535.183.01 Driver Version: 535.183.01 CUDA Version: 12.2 |
|-----------------------------------------+----------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+======================+======================|
| 0 NVIDIA GeForce GTX 1080 Ti Off | 00000000:01:00.0 Off | N/A |
| 0% 44C P2 58W / 250W | 430MiB / 11264MiB | 1% Default |
| | | N/A |
+-----------------------------------------+----------------------+----------------------+
+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 8606 G /usr/lib/xorg/Xorg 9MiB |
| 0 N/A N/A 1256916 C ...lib/plexmediaserver/Plex Transcoder 416MiB |
+---------------------------------------------------------------------------------------+
Then trying a 4K HDR10 (HEVC Main 10) (hw) -> 1080P (H264)—Transcode (hw) Stream to iOS (iPhone 15 Pro)
It keeps on trying to start playing, then it says the server is not powerful enough to play this.
+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 8606 G /usr/lib/xorg/Xorg 9MiB |
| 0 N/A N/A 1259286 C ...lib/plexmediaserver/Plex Transcoder 416MiB |
+---------------------------------------------------------------------------------------+
Then PMS crashes. Keep in mind this is with both hw decoding and encoding on.
In your /etc/modprobe.d/vfio.conf in Proxmox have you blacklisted both the GPU and the audio component of your GPU? Have you also blacklisted all of the Nvidia drivers in /etc/modprobe.d/blacklist.conf? Something like this… blacklist nvidia blacklist nvidiafb blacklist nvidia_drm
And, rebooted. If either of those aren’t done, you will see this behavior because the GPU is partially claimed by the Proxmox host.
The transcoder always tests the GPU to ensure there’s enough video memory available for the job it’s about to run and it can perform the requested transcode.
This is why you see it pop in and out prior to the actual transcode
@ChuckPa@rubylaser
Already taken those steps when I set the GPU up for Proxmox. It’s even worse for 4K HDR->1080P. Essentially it doesn’t even start, it just crashes PMS.
