What is your current Nvidia drivers version? Is it current release ?
PMS just updated the transcoder which will also bump the minimum version requirement for the Nvidia drivers.
Nov 30, 2021 06:07:11.582 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder)
Nov 30, 2021 06:07:11.582 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc
Nov 30, 2021 06:07:11.582 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Cannot load libcuda.so.1
Nov 30, 2021 06:07:11.582 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Could not dynamically load CUDA
Nov 30, 2021 06:07:11.582 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264 (decoder) with hwdevice vaapi
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - Rescanning for external libs: '/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/be22e26-4019-linux-x86_64/'
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - Trying to use DRM render node for device 0.
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - libva: VA-API version 1.9.0
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - libva: Trying to open /usr/lib/plexmediaserver/lib/dri/nouveau_drv_video.so
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - libva: va_openDriver() returns -1
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Failed to initialise VAAPI connection: -1 (unknown libva error).
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: I/O error
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264 (decoder) with hwdevice nvdec
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - Rescanning for external libs: '/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/be22e26-4019-linux-x86_64/'
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Cannot load libcuda.so.1
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Could not dynamically load CUDA
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Nov 30, 2021 06:07:11.583 [0x7f6ae8e84b38] DEBUG - [Transcode] Scaled up video bitrate to 8667Kbps based on 1.500000x fudge factor.
Nov 30, 2021 06:07:11.584 [0x7f6ae8e84b38] DEBUG - [Transcode] Streaming Resource: Reducing playback quality for 1904kbps stream bitrate: video resolution to 720x406, audio channels to 2, quality to 41, disable video DS as 7808kbps is > the 1724kbps available, disable audio DS as 384kbps is > the 162kbps available
Nov 30, 2021 06:07:11.584 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder)
Nov 30, 2021 06:07:11.584 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc
Nov 30, 2021 06:07:11.584 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Cannot load libcuda.so.1
Nov 30, 2021 06:07:11.584 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Could not dynamically load CUDA
Nov 30, 2021 06:07:11.584 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264 (decoder) with hwdevice vaapi
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - Rescanning for external libs: '/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/be22e26-4019-linux-x86_64/'
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API vaapi
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - Trying to use DRM render node for device 0.
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - libva: VA-API version 1.9.0
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - libva: Trying to open /usr/lib/plexmediaserver/lib/dri/nouveau_drv_video.so
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - libva: va_openDriver() returns -1
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Failed to initialise VAAPI connection: -1 (unknown libva error).
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: I/O error
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264 (decoder) with hwdevice nvdec
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] VERBOSE - [Transcode] [FFMPEG] - Rescanning for external libs: '/var/lib/plexmediaserver/Library/Application\ Support/Plex\ Media\ Server/Codecs/be22e26-4019-linux-x86_64/'
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvdec
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Cannot load libcuda.so.1
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Could not dynamically load CUDA
Nov 30, 2021 06:07:11.585 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] Scaled up video bitrate to 8667Kbps based on 1.500000x fudge factor.
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] Scaled maximum bitrate for resolution reduction to 1215Kbps.
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: Selected protocol hls; container: mkv
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: analyzing media item 136971
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: E7 - Who Gets Number One?: Direct Play is disabled
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: E7 - Who Gets Number One?: media must be transcoded in order to use the hls protocol
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: E7 - Who Gets Number One?: Direct Streaming is disabled, so video stream will be transcoded
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: E7 - Who Gets Number One?: no remuxable profile found, so video stream will be transcoded
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: testing h264_nvenc (encoder)
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: testing API nvenc
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Cannot load libcuda.so.1
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] ERROR - [Transcode] [FFMPEG] - Could not dynamically load CUDA
Nov 30, 2021 06:07:11.586 [0x7f6ae8e84b38] DEBUG - [Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Nov 30, 2021 06:07:11.587 [0x7f6ae8e84b38] DEBUG - [Transcode] MDE: Cannot direct stream video stream due to profile or setting limitations
In the future – VERBOSE is not needed. It generally makes more noise than value and shortens log retention to 2 minutes. DEBUG logging is the default and preferred.