# "Conversion failed" on multiple clients

**URL:** <https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060>\
**Category:** Plex Media Server\
**Tags:** server-linux, playback\
**Created:** [April 16, 2023, 3:11am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060 "2023-04-16T03:11:52Z")\
**Posts on this page:** 14\
**Page:** 1

<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [April 16, 2023, 3:11am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/1 "2023-04-16T03:11:52Z")

</div>

Server Version#: 1.32.0.6918  
Player Version#: Web 4.100.1 / Android TV 9.20.0.806

Hardware transcoding fails - getting error “Conversion failed. The transcoder exited due to an error.” Getting this error, or similar errors, on multiple devices. This was previously working before, then the transcoding started to get very slow and  
choppy. I updated the server to the latest verion, and started getting this error.

My server has and uses a quadro P400, or at least it used to. I never had problems transcoding before.

[Plex Media Server Logs\_2023-04-15\_23-06-44.zip](https://forums.plex.tv/uploads/short-url/ku96zJVODs3OaICW5BpCBkpquF7.zip) (4.6 MB)

---

<div class="post-metadata">

**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\
**Post date:** [April 16, 2023, 4:34am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/2 "2023-04-16T04:34:54Z")

</div>

1. Your user-supplied certificate needs updating

```auto
Apr 15, 2023 22:56:17.964 [0x7f4a53d7da90] DEBUG - FeatureManager: Using cached data for features list
Apr 15, 2023 22:56:18.154 [0x7f4a53d7da90] ERROR - [CERT] PKCS12_parse failed: error:0308010C:digital envelope routines::unsupported
Apr 15, 2023 22:56:18.154 [0x7f4a53d7da90] ERROR - [CERT] Found a certificate, but couldn't install it.
Apr 15, 2023 22:56:18.154 [0x7f4a53d7da90] DEBUG - MyPlex: mapping state set to 'Unknown'.
Apr 15, 2023 22:56:18.155 [0x7f4a53d7da90] DEBUG - Relay: read 35 cached entries from hosts file
Apr 15, 2023 22:56:18.156 [0x7f4a53d7da90] DEBUG - [CERT] CERT: Forcing refresh.
Apr 15, 2023 22:56:18.159 [0x7f4a53d7da90] ERROR - [CERT] PKCS12_parse failed: error:0308010C:digital envelope routines::unsupported
Apr 15, 2023 22:56:18.159 [0x7f4a53d7da90] DEBUG - [CERT] CERT: Unable to parse existing certificate, fetching a new one.

```

> [@Linux Tips](https://forums.plex.tv/t/linux-tips/276247/25):
>
> OpenSSL v3.0.0 and PMS. For those using their own domains and certificates with PMS , PMS 1.32.0.6865 and above updates OpenSSL from v1.1.1 to v3.0.0 . (changed the numbering scheme in the process) The consequence of this is OpenSSL v3 removed several “less secure” encryption methods. The impact on you, if you’re using an older distributions where openssl v3 is not the default, if not already doing so, you will need pay special attention to how your certificates are generated As example,…

1. I see where you’re directing to /dev/dri/renderD129.

```auto
Apr 15, 2023 22:57:04.135 [0x7f4a4a117b38] DEBUG - [Req#383/Transcode] TPU: hardware transcoding: final decoder: , final encoder: vaapi
Apr 15, 2023 22:57:04.135 [0x7f4a4a117b38] DEBUG - [Req#383/Transcode/JobRunner] Job running: FFMPEG_EXTERNAL_LIBS='/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/e51a01b-4528-linux-x86_64/' X_PLEX_TOKEN=xxxxxxxxxxxxxxxxxxxx46ce-ae97-538446215785 "/usr/lib/plexmediaserver/Plex Transcoder" -codec:0 h264 -codec:1 ac3 -analyzeduration 20000000 -probesize 20000000 -i "/home/nicholush/Videos/TV/Parks and Recreation/Season 1/Parks and Recreation - S01E01 - Make My Pit a Park WEBDL-1080p.mkv" -filter_complex "[0:0]scale=w=1920:h=1080:force_divisible_by=4[0];[0]format=pix_fmts=nv12[1];[1]hwupload[2]" -map "[2]" -codec:0 h264_vaapi -b:0 20000k -r:0 23.975999999999999 -force_key_frames:0 "expr:gte(t,n_forced*1)" -filter_complex "[0:1] aresample=async=1:ochl='stereo':rematrix_maxval=0.000000dB:osr=48000[3]" -map "[3]" -metadata:s:1 language=eng -codec:1 aac -b:1 256k -f dash -seg_duration 1 -dash_segment_type mp4 -init_seg_name 'init-stream$RepresentationID$.m4s' -media_seg_name 'chunk-stream$RepresentationID$-$Number%05d$.m4s' -window_size 5 -delete_removed false -skip_to_segment 1 -time_delta 0.0625 -manifest_name "http://127.0.0.1:32400/video/:/transcode/session/pptm6wy0hcc53yeeox6loc12/72ba05a8-6082-4c7f-874d-1bd14d0272fc/manifest?X-Plex-Http-Pipeline=infinite" -avoid_negative_ts disabled -map_metadata -1 -map_chapters -1 dash -start_at_zero -copyts -vsync cfr -init_hw_device vaapi=vaapi:/dev/dri/renderD129 -filter_hw_device vaapi -y -nostats -loglevel quiet -loglevel_plex error -progressurl http://127.0.0.1:32400/video/:/transcode/session/pptm6wy0hcc53yeeox6loc12/72ba05a8-6082-4c7f-874d-1bd14d0272fc/progress

```

But the output is Vaapi not Nvidia.

If it were nvidia, it would state so. (nvdec / nvenc )

what driver version is installed ?

---

<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [April 17, 2023, 4:50am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/3 "2023-04-17T04:50:32Z")

</div>

Thanks so much for the response!

Regarding the first…I, uh…hmm. I have no idea what’s going on there. I don’t know what user-supplied certificate is being used, I frankly don’t even have much of an idea of what this even constitutes.

The server does connect through a VPN. That’s the only thing that I can think of that might have anything to do with anything else.

When I open the “Network” section of server settings on the dashboard, I do see input boxes, for “custom certificate location”, “custom certificate encryption key” and “custom certificate domain.” All of these boxes are empty.

With the second…I’m not sure why it’s going to VAAPI. I certainly didn’t change any setting or try to set it that way. How do I set it back?

The nvidia driver is 525.105.17.

---

<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [May 1, 2023, 5:04pm UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/4 "2023-05-01T17:04:09Z")

</div>

Any other help to be had here?

---

<div class="post-metadata">

**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\
**Post date:** [May 1, 2023, 6:25pm UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/5 "2023-05-01T18:25:27Z")

</div>

> [@nicholush\_gmail\_com](#):
>
> The server does connect through a VPN.

That explains it.

When PMS gets the data returned through the VPN the VPN provider’s domain and certifcate got attached along the way.

PMS is very specific here. It won’t let any unknown domain be referenced in connections.

Historically, VPS and PMS never work well.

---

<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [May 3, 2023, 11:33am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/6 "2023-05-03T11:33:15Z")

</div>

> [@ChuckPa](#):
>
> That explains it.
> 
> When PMS gets the data returned through the VPN the VPN provider’s domain and certifcate got attached along the way.
> 
> PMS is very specific here. It won’t let any unknown domain be referenced in connections.
> 
> Historically, VPS and PMS never work well.

OK. Turned off the VPN, restarted the machine. Same error 😕

I’m confused as to why it is trying to use the VAAPI instead of nvidia. My processor is a 4th gen Intel without quicksync.

[Plex Media Server Logs\_2023-05-02\_23-51-49.zip](https://forums.plex.tv/uploads/short-url/uFht2ns9h68mQxJ2oZyEYRWdTT.zip) (4.5 MB)

---

<div class="post-metadata">

**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\
**Post date:** [May 3, 2023, 4:39pm UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/7 "2023-05-03T16:39:17Z")

</div>

This is very much an odd one. Thanks for making my day interesting 🙂

1. The CPU is an i3-4xxx which does have QSV capability (1080p only)
2. Looking at your logs,  
– It finds both capabilities (Nvidia and QSV)  
– It validates the Nvidia  
– It selects the Nvidia for decode  
– It selects QSV for the encode (incorrectly) when it should have selected the Nvidia because that CPU does not have sufficient OpenCL capability.

```auto
May 02, 2023 23:48:23.089 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android] [FFMPEG] - Format 0x30313050 -> p010le.
May 02, 2023 23:48:23.089 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android] [FFMPEG] - Created surface 0x4000000.
May 02, 2023 23:48:23.089 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android] [FFMPEG] - Direct mapping possible.
May 02, 2023 23:48:23.089 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android] TPU: hardware transcoding: final decoder: nvdec, final encoder: vaapi
May 02, 2023 23:48:23.090 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android/JobRunner] Job running: EAE_ROOT=/tmp/pms-8233ef27-9f14-433b-b691-82e5c8ce21aa/EasyAudioEncoder FFMPEG_EXTERNAL_LIBS='/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/e51a01b-4528-linux-x86_64/' X_PLEX_TOKEN=xxxxxxxxxxxxxxxxxxxx4592-8a15-9bc64eca217b "/usr/lib/plexmediaserver/Plex Transcoder" -codec:0 hevc -hwaccel:0 nvdec -hwaccel_fallback_threshold:0 10 -threads:0 1 -hwaccel_device:0 cuda -codec:1 truehd_eae -eae_prefix:1 8c85087b4294f9cc-com-plexapp-android_ -analyzeduration 20000000 -probesize 20000000 -i "/home/nicholush/Videos/Movies/Dune (2021)/Dune (2021) Remux-2160p.mkv" -filter_complex "[0:0]scale=w=3840:h=2160:force_divisible_by=4[0];[0]format=p010,tonemap=mobius[1];[1]format=pix_fmts=nv12[2];[2]hwupload[3]" -map "[3]" -metadata:s:0 language=eng -codec:0 h264_vaapi -b:0 62208k -maxrate:0 82944k -bufsize:0 165888k -r:0 23.975999999999999 -force_key_frames:0 "expr:gte(t,n_forced*1)" -filter_complex "[0:1] aresample=async=1:ochl='7.1':rematrix_maxval=0.000000dB:osr=48000[4]" -map "[4]" -metadata:s:1 language=eng -codec:1 libopus -b:1 1024k -segment_format matroska -f ssegment -individual_header_trailer 0 -flags +global_header -segment_header_filename header -segment_time 1 -segment_start_number 0 -segment_copyts 1 -segment_time_delta 0.0625 -segment_list "http://127.0.0.1:32400/video/:/transcode/session/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c/manifest?X-Plex-Http-Pipeline=infinite" -segment_list_type csv -segment_list_size 5 -segment_list_separate_stream_times 1 -segment_list_unfinished 1 -segment_format_options output_ts_offset=10 -max_delay 5000000 -avoid_negative_ts disabled -map_metadata:g -1 -map_metadata:c -1 -map_chapters -1 "media-%05d.ts" -start_at_zero -copyts -vsync cfr -init_hw_device vaapi=vaapi:/dev/dri/renderD129 -filter_hw_device vaapi -y -nostats -loglevel quiet -loglevel_plex error -progressurl http://127.0.0.1:32400/video/:/transcode/session/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c/progress
May 02, 2023 23:48:23.090 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android/JobRunner] In directory: "/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-8c85087b4294f9cc-com-plexapp-android-9151ba3c-d4af-4680-9b69-89fd6e17ec0c"
May 02, 2023 23:48:23.090 [0x7f9d8325cb38] DEBUG - [Req#701b/Transcode/8c85087b4294f9cc-com-plexapp-android/JobRunner] Jobs: Starting child process with pid 600263
May 02, 2023 23:48:23.101 [0x7f9d8de02b38] DEBUG - Request: [127.0.0.1:44680 (Loopback)] PUT /video/:/transcode/session/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c/progress?status=startup (15 live) #67ac Signed-in Token (nicho555) (range: bytes=0-) 
May 02, 2023 23:48:23.102 [0x7f9d908acb38] DEBUG - Completed: [127.0.0.1:44680] 204 PUT /video/:/transcode/session/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c/progress?status=startup (15 live) #67ac 0ms 203 bytes (pipelined: 1) (range: bytes=0-) 
May 02, 2023 23:48:23.109 [0x7f9d8de02b38] ERROR - [Req#704d/Transcode/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c] [AVHWDeviceContext @ 0x7fb0c1915e00] Failed to initialise VAAPI connection: -1 (unknown libva error).
May 02, 2023 23:48:23.110 [0x7f9d8de02b38] ERROR - [Req#7052/Transcode/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c] Device creation failed: -5.
May 02, 2023 23:48:23.110 [0x7f9d8de02b38] ERROR - [Req#7055/Transcode/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c] Failed to set value 'vaapi=vaapi:/dev/dri/renderD129' for option 'init_hw_device': I/O error
May 02, 2023 23:48:23.110 [0x7f9d8de02b38] ERROR - [Req#7057/Transcode/8c85087b4294f9cc-com-plexapp-android/9151ba3c-d4af-4680-9b69-89fd6e17ec0c] Error parsing global options: I/O error
May 02, 2023 23:48:23.111 [0x7f9d90b25b38] DEBUG - Jobs: '/usr/lib/plexmediaserver/Plex Transcoder' exit code for process 600263 is 1 (failure)
May 02, 2023 23:48:24.480 [0x7f9d908acb38] DEBUG - Auth: authenticated user 201271834 as NickKim

```

Notice how it’s attempting to use the QSV for tonemapping and fails (as it will).  
However – It shouldn’t be attempting to use it

The logs now show it attempting VAAPI on the Nvidia (/dev/dri/renderD129) which will obviously fail.

My first questions are:

1. Are all the nvidia drivers loaded, specifically `nvidia-decode` and `nvidia-encode` ?
2. Do those versions match the main Nvidia drivers which are installed ?  
`dpkg -l | grep nvidia`

---

<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [May 4, 2023, 5:06am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/8 "2023-05-04T05:06:21Z")

</div>

> [@ChuckPa](#):
>
> This is very much an odd one. Thanks for making my day interesting 🙂

Happy to be of assistance! I really appreciate the help.

> 1. Are all the nvidia drivers loaded, specifically `nvidia-decode` and `nvidia-encode` ?
> 2. Do those versions match the main Nvidia drivers which are installed ?  
> `dpkg -l | grep nvidia`

I think so…?

 ![dpkg -l](https://global.discourse-cdn.com/plex/original/4X/a/7/a/a7a84548708816410a7f72b56a89fa8c36fdb84d.png)

…but maybe not? I don’t know. Clearly, I’m not an expert.

 ![lsmod](https://global.discourse-cdn.com/plex/original/4X/d/f/3/df3c6ea82c73f46e5835caa300d8731cf7c56688.png)

---

<div class="post-metadata">

**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\
**Post date:** [May 4, 2023, 7:42am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/9 "2023-05-04T07:42:37Z")

</div>

Thank you for providing the listing.

You have two sets of invidia drivers installed (515 and 525). You only should have one.

Once the libnvidia-encode is working correctly, it won’t try to tonemap on a CPU which is incapable.

Here are my Nvidia drivers, inclusive of development tools (you can ignore).

```auto
[chuck@lizum ~.2000]$ dpkg -l | grep nvidia
ii gpustat 0.6.0-1 all pretty nvidia device monitor
ii libnvidia-cfg1-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA binary OpenGL/GLX configuration library
ii libnvidia-common-525-server 525.105.17-0ubuntu0.20.04.1 all Shared files used by the NVIDIA libraries
ii libnvidia-compute-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA libcompute package
ii libnvidia-decode-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA Video Decoding runtime libraries
ii libnvidia-encode-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 NVENC Video Encoding runtime library
ii libnvidia-extra-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 Extra libraries for the NVIDIA Server Driver
ii libnvidia-fbc1-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA OpenGL-based Framebuffer Capture runtime library
ii libnvidia-gl-525-server:amd64 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD
ii libnvidia-ml-dev 10.1.243-3 amd64 NVIDIA Management Library (NVML) development files
ii nvidia-compute-utils-525-server 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA compute utilities
ii nvidia-cuda-dev 10.1.243-3 amd64 NVIDIA CUDA development files
ii nvidia-cuda-doc 10.1.243-3 all NVIDIA CUDA and OpenCL documentation
ii nvidia-cuda-gdb 10.1.243-3 amd64 NVIDIA CUDA Debugger (GDB)
ii nvidia-cuda-toolkit 10.1.243-3 amd64 NVIDIA CUDA development toolkit
ii nvidia-dkms-525-server 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA DKMS package
ii nvidia-driver-525-server 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA Server Driver metapackage
ii nvidia-kernel-common-525-server 525.105.17-0ubuntu0.20.04.1 amd64 Shared files used with the kernel module
ii nvidia-kernel-source-525-server 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA kernel source package
ii nvidia-opencl-dev:amd64 10.1.243-3 amd64 NVIDIA OpenCL development files
ii nvidia-prime 0.8.16~0.20.04.2 all Tools to enable NVIDIA's Prime
ii nvidia-profiler 10.1.243-3 amd64 NVIDIA Profiler for CUDA and OpenCL
ii nvidia-utils-525-server 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA Server Driver support binaries
ii nvidia-visual-profiler 10.1.243-3 amd64 NVIDIA Visual Profiler for CUDA and OpenCL
ii xserver-xorg-video-nvidia-525-server 525.105.17-0ubuntu0.20.04.1 amd64 NVIDIA binary Xorg driver
[chuck@lizum ~.2001]$ 

```

Please clean out your older drivers and the i386 modules. Everything is 64 bit.

Don’t forget to update the initram-fs when done.

---

<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [May 5, 2023, 4:17am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/10 "2023-05-05T04:17:04Z")

</div>

Continuing the discussion from ["Conversion failed" on multiple clients](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/9):

Thanks for walking through this with me.

I uninstalled as much as I could…

 ![clean dpkg](https://global.discourse-cdn.com/plex/original/4X/6/c/4/6c474b40345443df9e91c1321c339e999f7e5ba1.png)

Restarted, and installed a fresh set of nvidia drivers - (sudo apt install nvidia-driver-530)

 ![after install dpkg](https://global.discourse-cdn.com/plex/original/4X/1/f/1/1f1513877d0988b6e5b87881f6386187aff1e815.png)

Getting the same error / behavior.

[Plex Media Server Logs\_2023-05-05\_00-10-28.zip](https://forums.plex.tv/uploads/short-url/b5kYmjfGE2qr0kKUpTTCdvhvX0x.zip) (2.8 MB)

For what it’s worth, I do run a Jellyfin server side-by-side with Plex, and the hardware transcoding is currently working. Transcoded video plays fine, and there is an ffmpeg process running in nvidia-smi when it is playing. Not trying to start ■■■■, or whatever, just trying to provide diagnostic information.

---

<div class="post-metadata">

**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\
**Post date:** [May 5, 2023, 4:58am UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/11 "2023-05-05T04:58:30Z")

</div>

That output isn’t right. `un` should not be listed.

```auto
dpkg -l | grep nvidia

```

is what you want.

Install this. It’s an Engineer’s build with the updated drivers installed.

> **[plexmediaserver\_1.32.2.6997-416face2b\_amd64.deb](https://drive.google.com/file/d/1BICK8zpHH4xtems61TpLeganp7_M0tDS/view?usp=sharing)**
>
> Google Drive file.

What bothers me – It knows /dev/dri/renderD129 is the nvidia but trying to test as VAAPI.

Do you have libva manually installed ?

Don’t remember asking but is this in a VM ?

In your logs, this is where it goes wrong.

```auto
May 05, 2023 00:05:04.873 [0x7f6a39f4db38] DEBUG - [Req#bc3/Transcode] Starting a transcode session 1fskf6hms9wpp19sx2htcr3o at offset -1.0 (state=3)
May 05, 2023 00:05:04.874 [0x7f6a39f4db38] DEBUG - [Req#bc3/Transcode] TPU: hardware transcoding: using hardware decode accelerator nvdec
May 05, 2023 00:05:04.874 [0x7f6a39f4db38] DEBUG - [Req#bc3/Transcode] TPU: hardware transcoding: zero-copy support not present

```

zero-copy should be present. I don’t know if a card limitation or what.  
How much memory?

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<div class="post-metadata">

**Author:** ![nicholush\_gmail\_com](https://avatars.discourse-cdn.com/v4/letter/n/c89c15/32.png) [@nicholush\_gmail\_com](https://forums.plex.tv/u/nicholush_gmail_com)\
**Post date:** [May 5, 2023, 1:16pm UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/12 "2023-05-05T13:16:33Z")

</div>

![dpkg after install](https://global.discourse-cdn.com/plex/original/4X/5/a/a/5aaa56a5a4e9f5283ad9ba8d7e09c99c3bdca8e2.png)

I don’t recall installing libva manually. This machine serves almost exclusively as a Plex server, I can’t think of any reason I would have installed that manually.

Nothing is running through a VM.

I will install the Engineer’s build and report back. Thanks.

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<div class="post-metadata">

**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\
**Post date:** [May 5, 2023, 8:19pm UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/13 "2023-05-05T20:19:33Z")

</div>

@nicholush_gmail_com

I’ve done some research about the Nvidia cards .

Look at the P400 .

> **[Video Encode and Decode GPU Support Matrix](https://developer.nvidia.com/video-encode-and-decode-gpu-support-matrix-new)**
>
> Find the related video encoding and decoding support for all NVIDIA GPU products.

According to the matrix, you can transcode HEVC 4:2:0 encoded but not HEVC 4:4:4

 ![Screenshot from 2023-05-05 16-18-17](https://global.discourse-cdn.com/plex/original/4X/6/b/b/6bb6518d445715f66c71f6c0d80fc557495cde6a.png)

Check the files you’re using.

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<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/plex/original/3X/2/a/2acb9765406f63293d357b4ec509ec39aa28f2ad.png) [@system](https://forums.plex.tv/u/system)\
**Post date:** [August 3, 2023, 8:20pm UTC](https://forums.plex.tv/t/conversion-failed-on-multiple-clients/838060/14 "2023-08-03T20:20:22Z")

</div>

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