I have Plex container installed at Unraid with Celeron 5095 CPU (which can support HEVC decode). Joined Plex premium membership and enable the Use hardware acceleration when available in Plex transcode setting page.
Played the HEVC (H.265) video and found CPU hiking to 100%. Checked the log and found hardware transcode failed to start bcoz opening hw device failed. Not sure which part is missing. Pls help.
Server Version#: Plex Version 1.32.5.7349
Player Version#:
Sep 08, 2023 17:13:45.419 [23103432821560] Debug — [Req#1659/Transcode/Req#1662] We’re going to try to auto-select an audio stream for account 1.
Sep 08, 2023 17:13:45.419 [23103432821560] Debug — [Req#1659/Transcode/Req#1662] Selecting best audio stream for part ID 35503 (language: )
Sep 08, 2023 17:13:45.419 [23103432821560] Debug — [Req#1659/Transcode/Req#1662] Audio Stream: 97398, Subtitle Stream: -1
Sep 08, 2023 17:13:45.420 [23103432821560] Debug — [Req#1659/Transcode] Codecs: testing h264_nvenc (encoder)
Sep 08, 2023 17:13:45.420 [23103432821560] Debug — [Req#1659/Transcode] Codecs: hardware transcoding: testing API nvenc for device ‘’ ()
Sep 08, 2023 17:13:45.420 [23103432821560] Error — [Req#1659/Transcode] [FFMPEG] - Cannot load libcuda.so.1
Sep 08, 2023 17:13:45.420 [23103432821560] Error — [Req#1659/Transcode] [FFMPEG] - Could not dynamically load CUDA
Sep 08, 2023 17:13:45.420 [23103432821560] Debug — [Req#1659/Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Operation not permitted
Sep 08, 2023 17:13:45.420 [23103432821560] Debug — [Req#1659/Transcode] Could not create hardware context for h264_nvenc
Sep 08, 2023 17:13:45.421 [23103432821560] Debug — [Req#1659/Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi
Sep 08, 2023 17:13:45.422 [23103432821560] Debug — [Req#1659/Transcode] Codecs: hardware transcoding: testing API vaapi for device ‘’ ()
Sep 08, 2023 17:13:45.422 [23103432821560] Debug — [Req#1659/Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Generic error in an external library
Sep 08, 2023 17:13:45.422 [23103432821560] Debug — [Req#1659/Transcode] Could not create hardware context for hevc
Sep 08, 2023 17:13:45.422 [23103432821560] Debug — [Req#1659/Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec
Sep 08, 2023 17:13:45.423 [23103432821560] Debug — [Req#1659/Transcode] Codecs: hardware transcoding: testing API nvdec for device ‘’ ()
Sep 08, 2023 17:13:45.423 [23103432821560] Error — [Req#1659/Transcode] [FFMPEG] - Cannot load libcuda.so.1
Sep 08, 2023 17:13:45.423 [23103432821560] Error — [Req#1659/Transcode] [FFMPEG] - Could not dynamically load CUDA
Sep 08, 2023 17:13:45.423 [23103432821560] Debug — [Req#1659/Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Operation not permitted
Sep 08, 2023 17:13:45.423 [23103432821560] Debug — [Req#1659/Transcode] Could not create hardware context for hevc
Sep 08, 2023 17:13:45.424 [23103432821560] Debug — [Req#1659/Transcode] MDE: Selected protocol dash; container: mp4
