# HW transcode not working with NVENC **URL:** \ **Category:** Plex Media Server\ **Tags:** server-linux\ **Created:** [January 6, 2021, 10:35pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314 "2021-01-06T22:35:39Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![qube001](https://avatars.discourse-cdn.com/v4/letter/q/5f9b8f/32.png) [@qube001](https://forums.plex.tv/u/qube001)\ **Post date:** [January 6, 2021, 10:35pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/1 "2021-01-06T22:35:39Z")
Hello I am fighting with HW transcode on my bare metal (HP microserver) **headless** debian 10 box with AMD CPU and NVIDIA quadro 400 GPU My plex box has no more the guts to transcode HEVC with CPU, I need the help of GPU I am aware that missing quicksync feature of my CPU is not an issue, as plex will skip to NVENC if available. As I have a valid plex pass, I for sure enabled hardware transcoding in plex config UI, double check. here is my kernel, might be the cuplrit? ```auto # uname -a Linux microserver 4.19.0-13-amd64 #1 SMP Debian 4.19.160-2 (2020-11-28) x86_64 GNU/Linux ``` Installed required drivers version from backports : > nvidia-driver 450.80 here is the output of nvidia-smi ```auto +-----------------------------------------------------------------------------+ | NVIDIA-SMI 450.80.02 Driver Version: 450.80.02 CUDA Version: N/A | |-------------------------------+----------------------+----------------------+ | 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 Quadro P400 On | 00000000:01:00.0 Off | N/A | | 34% 25C P8 N/A / N/A | 1MiB / 1999MiB | 0% Default | | | | N/A | +-------------------------------+----------------------+----------------------+ +-----------------------------------------------------------------------------+ | Processes: | | GPU GI CI PID Type Process name GPU Memory | | ID ID Usage | |=============================================================================| | No running processes found | +-----------------------------------------------------------------------------+ ``` plex membership looks OK : ```auto # groups plex plex : plex video wonder render ``` ```auto # ls -ls /dev/nvidia* 0 crw-rw-rw- 1 root root 195, 0 déc. 30 06:12 /dev/nvidia0 0 crw-rw-rw- 1 root root 195, 255 déc. 30 06:12 /dev/nvidiactl 0 crw-rw-rw- 1 root root 195, 254 déc. 30 06:12 /dev/nvidia-modeset /dev/nvidia-caps: total 0 0 cr-------- 1 root root 246, 1 déc. 29 23:48 nvidia-cap1 0 cr--r--r-- 1 root root 246, 2 déc. 29 23:48 nvidia-cap2 ``` ```auto # ls -la /dev/dri total 0 drwxr-xr-x 3 root root 100 déc. 30 06:12 . drwxr-xr-x 19 root root 3680 déc. 29 23:48 .. drwxr-xr-x 2 root root 80 déc. 30 06:12 by-path crw-rw---- 1 root render 226, 0 déc. 30 06:12 card0 crw-rw---- 1 root render 226, 128 déc. 30 06:12 renderD128 ``` I still can’t get HW transcode, from the logs : ```auto Jan 06, 2021 22:19:17.691 [0x7f172b7fe700] DEBUG - Completed: [127.0.0.1:52328] 200 PUT /video/:/transcode/session/2iv0s3tc9vgnljyfafgkld91/aa09dd0a-f877-4cf9-9181-41da29b0a94d/progress/streamDetail?index=3&id=0&codec=hdmv_pgs_subtitle&type=subtitle&language=eng (19 live) 0ms 195 bytes (pipelined: 11) (range: bytes=0-) Jan 06, 2021 22:19:17.692 [0x7f1703fff700] DEBUG - Request: [127.0.0.1:52328 (Loopback)] PUT /video/:/transcode/session/2iv0s3tc9vgnljyfafgkld91/aa09dd0a-f877-4cf9-9181-41da29b0a94d/progress/streamDetail?index=4&id=0&codec=ac3&type=audio&bitrate=640000&language=eng&channels=6&layout=5.1%28side%29&sampleRate=48000&disp_default=1 (19 live) Signed-in Token (qube001) (range: bytes=0-) Jan 06, 2021 22:19:17.693 [0x7f172b7fe700] DEBUG - Completed: [127.0.0.1:52328] 200 PUT /video/:/transcode/session/2iv0s3tc9vgnljyfafgkld91/aa09dd0a-f877-4cf9-9181-41da29b0a94d/progress/streamDetail?index=4&id=0&codec=ac3&type=audio&bitrate=640000&language=eng&channels=6&layout=5.1%28side%29&sampleRate=48000&disp_default=1 (19 live) 0ms 195 bytes (pipelined: 12) (range: bytes=0-) qube@ipv4:~/Téléchargements/PLEX$ grep -i codec Plex\ Media\ Server.log Jan 06, 2021 22:03:51.810 [0x7f17037fe700] DEBUG - Job running: EAE_ROOT='/tmp/pms-db82c3d9-3653-4bb6-945a-068c0508b050/EasyAudioEncoder' FFMPEG_EXTERNAL_LIBS='/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/367b3d4-3654-linux-x86_64/' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/usr/lib/plexmediaserver/Plex Media Scanner' '--scan' '--refresh' '--section' '8' '--activity' 'cf4e586d-f53b-4f93-9db4-ce7adb03012f' Jan 06, 2021 22:19:17.515 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 06, 2021 22:19:17.515 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 06, 2021 22:19:17.515 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.515 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 06, 2021 22:19:17.516 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] MDE: Cannot direct stream audio stream due to codec ac3 when profile only allows aac Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 06, 2021 22:19:17.517 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.518 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.519 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.520 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi Jan 06, 2021 22:19:17.521 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 06, 2021 22:19:17.521 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 06, 2021 22:19:17.521 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec Jan 06, 2021 22:19:17.521 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec Jan 06, 2021 22:19:17.521 [0x7f1729ffb700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred Jan 06, 2021 22:19:17.521 [0x7f1729ffb700] DEBUG - [Transcode] MDE: Cannot direct stream audio stream due to codec ac3 when profile only allows aac Jan 06, 2021 22:19:17.644 [0x7f16e27ec700] DEBUG - [Transcode] Job running: EAE_ROOT='/tmp/pms-db82c3d9-3653-4bb6-945a-068c0508b050/EasyAudioEncoder' FFMPEG_EXTERNAL_LIBS='/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/367b3d4-3654-linux-x86_64/' XDG_CACHE_HOME='/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Cache' XDG_DATA_HOME='/usr/lib/plexmediaserver/Resources' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/usr/lib/plexmediaserver/Plex Transcoder' '-codec:0' 'hevc' '-codec:1' 'ac3' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/mnt/storage/VIDEO/films/Le nom de la rose (1986).mkv' '-filter_complex' '[0:0]scale=w=1274:h=720[0];[0]format=pix_fmts=yuv420p|nv12[1]' '-filter_complex' '[0:1] aresample=async=1:ocl='\''stereo'\'':rematrix_maxval=0.000000dB:osr=48000[2]' '-map' '[1]' '-codec:0' 'libx264' '-crf:0' '23' '-maxrate:0' '3659k' '-bufsize:0' '7318k' '-r:0' '23.975999999999999' '-preset:0' 'veryfast' '-x264opts:0' 'subme=0:me_range=4:rc_lookahead=10:me=dia:no_chroma_me:8x8dct=0:partitions=none' '-force_key_frames:0' 'expr:gte(t,0+n_forced*3)' '-map' '[2]' '-metadata:s:1' 'language=fre' '-codec:1' 'aac' '-b:1' '119k' '-f' 'dash' '-seg_duration' '3' '-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/2iv0s3tc9vgnljyfafgkld91/aa09dd0a-f877-4cf9-9181-41da29b0a94d/manifest?X-Plex-Http-Pipeline=infinite' '-avoid_negative_ts' 'disabled' '-map_metadata' '-1' '-map_chapters' '-1' 'dash' '-start_at_zero' '-copyts' '-vsync' 'cfr' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/2iv0s3tc9vgnljyfafgkld91/aa09dd0a-f877-4cf9-9181-41da29b0a94d/progress' ``` It seems plex cannot access to NVIDIA hardware, I d’on’t get what could be wrong I hope someone in similar setup could give some pointers to help me to troubleshoot I thank you in advance for the enlightenment 🙂 Server Version#: 1.21.1.3830 Player Version#: ---
**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:** [January 6, 2021, 10:55pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/2 "2021-01-06T22:55:56Z")
Does the GPU support HEVC? > **[Video Encode and Decode GPU Support Matrix \[NEW\]](https://developer.nvidia.com/video-encode-and-decode-gpu-support-matrix-new)** > > Sort a HTML Table Alphabetically Video Encode and Decode GPU Support Matrix NVENC - Encoding (Click to expand) Consumer (GeForce) Professional (Quadro) Server (Tesla) DGX BOARD FAMILY CHIP NVENCGeneration Desktop/Mobile # OFCHIPS # OFNVENC/CHIP Total... If so, are the Nvidia drivers installed and current. ---
**Author:** ![qube001](https://avatars.discourse-cdn.com/v4/letter/q/5f9b8f/32.png) [@qube001](https://forums.plex.tv/u/qube001)\ **Post date:** [January 11, 2021, 10:21am UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/3 "2021-01-11T10:21:39Z")
Drivers are current at this time (or at least a required & known working version) see OP. yes H265 and H264 are supported both fore encode and decode with my quadro P400 AFAIK linux plex only support HW encoding, I’m fine with it I want plex to CPU decode HVEC or any high bitrate media then use NVENC to encode low bitrate H264 for remote peers ---
**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:** [January 11, 2021, 4:22pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/4 "2021-01-11T16:22:26Z")
Plex supports HEVC decode to H.264 encode on the Nvidia cards which are capable. If you aren’t getting decode then I suggest revisiting 1. Settings - Server - Transcoder - Show Advanced 2. The media info (codecs involved) as well as the Nvidia decode/encode matrix. ---
**Author:** ![burtonmadness](https://avatars.discourse-cdn.com/v4/letter/b/3e96dc/32.png) [@burtonmadness](https://forums.plex.tv/u/burtonmadness)\ **Post date:** [January 12, 2021, 6:39pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/5 "2021-01-12T18:39:43Z")
My Plex with P1000 stopped transcoding a few days after upgrading to plexmediaserver\_1.21.1.3830-6c22540d5\_amd64.deb… Playback and transcodes were working fine. Tried the latest plexmediaserver\_1.21.1.3876-3c3adfcb4\_amd64.deb, nvidia-smi showing ```auto nvidia-smi Tue Jan 12 10:35:24 2021 +-----------------------------------------------------------------------------+ | NVIDIA-SMI 440.100 Driver Version: 450.102.04 CUDA Version: 11.0 | |-------------------------------+----------------------+----------------------+ | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. | |===============================+======================+======================| | 0 Quadro P1000 Off | 00000000:1B:00.0 Off | N/A | | 34% 45C P0 N/A / N/A | 0MiB / 4040MiB | 0% Default | +-------------------------------+----------------------+----------------------+ +-----------------------------------------------------------------------------+ | Processes: GPU Memory | | GPU PID Type Process name Usage | |=============================================================================| | No running processes found | +-----------------------------------------------------------------------------+ Jan 12, 2021 10:28:21.901 [0x7f21737fe700] DEBUG - [Transcode] Audio Stream: 84563, Subtitle Stream: -1 Jan 12, 2021 10:28:21.902 [0x7f21737fe700] DEBUG - [Transcode] Codecs: testing h264_vaapi (encoder) Jan 12, 2021 10:28:21.902 [0x7f21737fe700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi Jan 12, 2021 10:28:21.902 [0x7f21737fe700] ERROR - [Transcode] [FFMPEG] - libva: vaGetDriverNameByIndex() failed with unknown libva error, driver_name = (null) Jan 12, 2021 10:28:21.902 [0x7f21737fe700] ERROR - [Transcode] [FFMPEG] - Failed to initialise VAAPI connection: -1 (unknown libva error). Jan 12, 2021 10:28:21.903 [0x7f21737fe700] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Input/output error Jan 12, 2021 10:28:21.903 [0x7f21737fe700] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder) Jan 12, 2021 10:28:21.903 [0x7f21737fe700] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc Jan 12, 2021 10:28:21.914 [0x7f21737fe700] DEBUG - [Transcode] [FFMPEG] - Loaded lib: libcuda.so.1 ``` ```auto Jan 12, 2021 10:37:48.133 [0x7f033ddda700] INFO - Plex Media Server v1.21.1.3876-3c3adfcb4 - Ubuntu PC x86_64 - build: linux-x86_64 debian - GMT -08:00 Jan 12, 2021 10:37:48.134 [0x7f033ddda700] INFO - Linux version: 18.04.4 LTS (Bionic Beaver), language: en-US Jan 12, 2021 10:37:48.134 [0x7f033ddda700] INFO - Processor Intel(R) Xeon(R) CPU E5-2650L v2 @ 1.70GHz Jan 12, 2021 10:37:48.134 [0x7f033ddda700] INFO - /usr/lib/plexmediaserver/Plex Media Server ``` ---
**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:** [January 12, 2021, 6:56pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/6 "2021-01-12T18:56:44Z")
That looks like a driver version mismatch. Are the Nvidia drivers up to date? ---
**Author:** ![burtonmadness](https://avatars.discourse-cdn.com/v4/letter/b/3e96dc/32.png) [@burtonmadness](https://forums.plex.tv/u/burtonmadness)\ **Post date:** [January 12, 2021, 7:01pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/7 "2021-01-12T19:01:19Z")
I’m running 440 (which was working), 460 is the latest available in my distro (Ubuntu 18.04.4 LTS) ---
**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:** [January 12, 2021, 7:29pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/8 "2021-01-12T19:29:06Z")
Please recreate and attach the full DEBUG log files ZIP I need to see what else is happening. > Jan 12, 2021 10:28:21.902 [0x7f21737fe700] ERROR - [Transcode] [FFMPEG] - libva: vaGetDriverNameByIndex() failed with unknown libva error, driver\_name = (null) is telling me the card is not responding for the type video requested. Look here: ```auto # Is there a Nvidia card present (possible HW transcoding capability) ["$(echo /sys/module/nvidia/drivers/pci:nvidia/*:*:*.*)" != "/sys/module/nvidia/drivers/pci:nvidia/*:*:*.*"] HaveNvidia=1 ``` ---
**Author:** ![burtonmadness](https://avatars.discourse-cdn.com/v4/letter/b/3e96dc/32.png) [@burtonmadness](https://forums.plex.tv/u/burtonmadness)\ **Post date:** [January 12, 2021, 9:04pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/9 "2021-01-12T21:04:38Z")
I upgraded the nvidia-\* drivers to 460 and h/w transcoding no longer failing. It was just weird as working last night than failed, even through no updates and reboots since between the hols. ---
**Author:** ![qube001](https://avatars.discourse-cdn.com/v4/letter/q/5f9b8f/32.png) [@qube001](https://forums.plex.tv/u/qube001)\ **Post date:** [January 22, 2021, 9:57pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/10 "2021-01-22T21:57:28Z")
@burtonmadess Well, I suggest you start your own thread, and say hello to people, that would be a clever start. ---
**Author:** ![qube001](https://avatars.discourse-cdn.com/v4/letter/q/5f9b8f/32.png) [@qube001](https://forums.plex.tv/u/qube001)\ **Post date:** [January 22, 2021, 10:39pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/11 "2021-01-22T22:39:09Z")
Double checked all settings as stated in OP HW trancode is enabled media is supported in the nvidia matrix same problem new version of nvidia drivers 460.32.03-1~bpo10+1 from backports I can get HW transcode to work ---
**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:** [January 22, 2021, 10:57pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/12 "2021-01-22T22:57:50Z")
#### To all here with this issue: Please allow me to reiterate … 1. DEBUG logging ON 2. VERBOSE logging OFF 3. Start Playback 4. Let play for 20 seconds then stop 5. Wait 20 seconds for all processes to terminate 6. Download Logs 7. Attach the ZIP it presents you. Sorry but I cannot diagnose what I can’t see. 🤷‍♂️ ---
**Author:** ![qube001](https://avatars.discourse-cdn.com/v4/letter/q/5f9b8f/32.png) [@qube001](https://forums.plex.tv/u/qube001)\ **Post date:** [January 23, 2021, 4:32pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/13 "2021-01-23T16:32:45Z")
Thank you for taking time to help me here is the log, started playing “Le Nom de la rose (1986)” wich is HEVC 4:2:0 supported by the quadro P400 according to the matrix according to the log, there are libcuda.so.1 errors, are those the culprits? regards [PMStruncated.log](https://forums.plex.tv/uploads/short-url/ofARQtyi8ct6VQu1rxuhjbyFgcn.log) (274.3 KB) ---
**Author:** ![qube001](https://avatars.discourse-cdn.com/v4/letter/q/5f9b8f/32.png) [@qube001](https://forums.plex.tv/u/qube001)\ **Post date:** [January 23, 2021, 5:05pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/14 "2021-01-23T17:05:02Z")
Turns out this was the culprit, documentation tells about installing current nvidia drivers but installing cuda is also needed (debian package required is **libnvidia-encode1** ) > apt install -t buster-backports nvidia-driver firmware-misc-nonfree libnvidia-encode1 nvidia-smi did the job for my debian system, I now get HW encoding, thank you for the kind support happy 🙂 ---
**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:** [January 23, 2021, 5:05pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/15 "2021-01-23T17:05:47Z")
@qube001 Sorry. just waking up here. Glad you figured it out ---
**Author:** ![adambahe](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/adambahe/32/83591_2.png) [@adambahe](https://forums.plex.tv/u/adambahe)\ **Post date:** [January 31, 2021, 8:32am UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/16 "2021-01-31T08:32:45Z")
I have been having this problem for a few months now.[Plex Media Server Logs\_2021-01-31\_02-28-23.zip](https://forums.plex.tv/uploads/short-url/wEc42trRku48lqgZ4Hu6dl6l0BX.zip) (1.7 MB) ```auto [root@nas Logs]# nvidia-smi Sun Jan 31 02:30:42 2021 +-----------------------------------------------------------------------------+ | NVIDIA-SMI 460.39 Driver Version: 460.39 CUDA Version: 11.2 | |-------------------------------+----------------------+----------------------+ | 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 Quadro P4000 Off | 00000000:02:00.0 Off | N/A | | 46% 39C P8 5W / 105W | 2MiB / 8119MiB | 0% Default | | | | N/A | +-------------------------------+----------------------+----------------------+ +-----------------------------------------------------------------------------+ | Processes: | | GPU GI CI PID Type Process name GPU Memory | | ID ID Usage | |=============================================================================| | No running processes found | +-----------------------------------------------------------------------------+ [root@nas Logs]# lspci|grep -i nvidia 02:00.0 VGA compatible controller: NVIDIA Corporation GP104GL [Quadro P4000] (rev a1) 02:00.1 Audio device: NVIDIA Corporation GP104 High Definition Audio Controller (rev a1) [root@nas Logs]# uname -a Linux nas 5.10.7-100.fc32.x86_64 #1 SMP Tue Jan 12 20:25:28 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux [root@nas Logs]# modinfo nvidia filename: /lib/modules/5.10.7-100.fc32.x86_64/kernel/drivers/video/nvidia.ko alias: char-major-195-* version: 460.39 supported: external license: NVIDIA srcversion: 88778FD9C7BD9CA16708044 alias: pci:v000010DEd*sv*sd*bc03sc02i00* alias: pci:v000010DEd*sv*sd*bc03sc00i00* depends: retpoline: Y name: nvidia vermagic: 5.10.7-100.fc32.x86_64 SMP mod_unload parm: NvSwitchRegDwords:NvSwitch regkey (charp) parm: NvSwitchBlacklist:NvSwitchBlacklist=uuid[,uuid...] (charp) parm: nv_cap_enable_devfs:Enable (1) or disable (0) nv-caps devfs support. Default: 1 (int) parm: NVreg_ResmanDebugLevel:int parm: NVreg_RmLogonRC:int parm: NVreg_ModifyDeviceFiles:int parm: NVreg_DeviceFileUID:int parm: NVreg_DeviceFileGID:int parm: NVreg_DeviceFileMode:int parm: NVreg_InitializeSystemMemoryAllocations:int parm: NVreg_UsePageAttributeTable:int parm: NVreg_RegisterForACPIEvents:int parm: NVreg_EnablePCIeGen3:int parm: NVreg_EnableMSI:int parm: NVreg_TCEBypassMode:int parm: NVreg_EnableStreamMemOPs:int parm: NVreg_EnableBacklightHandler:int parm: NVreg_RestrictProfilingToAdminUsers:int parm: NVreg_PreserveVideoMemoryAllocations:int parm: NVreg_EnableS0ixPowerManagement:int parm: NVreg_S0ixPowerManagementVideoMemoryThreshold:int parm: NVreg_DynamicPowerManagement:int parm: NVreg_DynamicPowerManagementVideoMemoryThreshold:int parm: NVreg_EnableUserNUMAManagement:int parm: NVreg_MemoryPoolSize:int parm: NVreg_KMallocHeapMaxSize:int parm: NVreg_VMallocHeapMaxSize:int parm: NVreg_IgnoreMMIOCheck:int parm: NVreg_NvLinkDisable:int parm: NVreg_EnablePCIERelaxedOrderingMode:int parm: NVreg_RegisterPCIDriver:int parm: NVreg_RegistryDwords:charp parm: NVreg_RegistryDwordsPerDevice:charp parm: NVreg_RmMsg:charp parm: NVreg_GpuBlacklist:charp parm: NVreg_TemporaryFilePath:charp [root@nas Logs]# rpm -qa|grep -i plexmedia plexmediaserver-1.21.2.3943-a91458577.x86_64 ``` ---
**Author:** ![adambahe](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/adambahe/32/83591_2.png) [@adambahe](https://forums.plex.tv/u/adambahe)\ **Post date:** [January 31, 2021, 9:59am UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/17 "2021-01-31T09:59:16Z")
I think I may have a hunch. Do any of you guys happen to have server level motherboards? Meaning, do they have an IPMI device? Specifically Supermicro? If you do an lspci|grep -i aspeed does anything show up? I have a hunch that for remote video for IPMI (iDrac/iLO/XCC/Supermicro) the kernel loads a small driver through a passthrough VGA controller to provide video to an IPMI device. Thus, we have a video card showing up that isn’t really a video card, and Plex may be trying to use it instead of nVidia. ---
**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:** [January 31, 2021, 5:02pm UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/18 "2021-01-31T17:02:23Z")
@adambahe there is an easy way to check & resolve that if true. 1. `ls -la /dev/dri` 2. If there are multiple entries then the kernel is seeing multiple devices 3. If there is one on the motherboard, it is most likely to be `renderD128` since the i915 is initialized first in QSV-capable CPUs 4. Nvidia cards will be next to add; e.g. `renderD129` , etc. If this is what you see, add the preference to select the card you wish to use in **Preferences.xml** at the end of the preferences string before the final closing `/>` > `HardwareDevicePath="/dev/dri/renderD129"` Also make certain the Nvidia drivers are installed and current plus that the card is listed in the Nvidia Decode and Encode matrix for the particular codec you wish it to process. ---
**Author:** ![adambahe](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/adambahe/32/83591_2.png) [@adambahe](https://forums.plex.tv/u/adambahe)\ **Post date:** [February 1, 2021, 2:53am UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/19 "2021-02-01T02:53:59Z")
I’d like to point the device path to the PCIE address like so: [root@nas by-path]# ls -ltrha total 0 lrwxrwxrwx 1 root root 13 Jan 31 02:08 pci-0000:02:00.0-render → …/renderD128 lrwxrwxrwx 1 root root 8 Jan 31 02:08 pci-0000:02:00.0-card → …/card1 Can I point it to /dev/dri/by-path/pci-0000:02:00.0-render ? Or should I point it to -card? ---
**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:** [February 1, 2021, 3:13am UTC](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314/20 "2021-02-01T03:13:36Z")
Point to it in `/dev/dri/renderD128`. It’s not looking for the ‘card’. It’s looking for the rendering device and how it presents itself. [Next page](https://forums.plex.tv/t/hw-transcode-not-working-with-nvenc/675314.md?page=2)