In the failed recording I found Plex allocates a tuner from your HDHR, but then the transcoder fails to start with a “System can not find the file specified”. The log portion that I’m looking at is in the dropdown below. Unfortunately I’ve not seen this particular error with my instance, and a quick google didn’t bring back any easy answers.
In Plex Web → Settings->Transcoder do you have anything set for “Transcoder temporary directory”? By default this is blank, but can be used to set the transcode temp directory to another location. Have you ever used this, or has it changed recently?
Try deleting your codecs while you have Plex Server down. Plex will re-download codec as needed.
Recording fail log extract
Jun 21, 2022 14:03:58.886 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Grabber: Going to record for 11462 seconds, final URL is http://192.168.1.101:5004/auto/v102
Jun 21, 2022 14:03:58.887 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MediaRecorderVirtual: setting stop time to 2022-06-21 17:15:00
Jun 21, 2022 14:03:58.887 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] DVR:Segmenter: Creating a new recorder for http://192.168.1.101:5004/auto/v102.
Jun 21, 2022 14:03:58.888 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Grabber: Waiting for a tuner on device://tv.plex.grabbers.hdhomerun/12511138 (4 available) for at most 11462 seconds.
Jun 21, 2022 14:03:58.888 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Grabber: Allocated a tuner on device://tv.plex.grabbers.hdhomerun/12511138 (3 left)
Jun 21, 2022 14:03:58.888 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] We're going to try to auto-select an audio stream for account 1.
Jun 21, 2022 14:03:58.888 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Selecting best audio stream for part ID -1 (autoselect: 1 language: en)
Jun 21, 2022 14:03:58.888 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] We're going to try to auto-select a subtitle.
Jun 21, 2022 14:03:58.888 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Audio Stream: -1, Subtitle Stream: -1
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: Selected protocol hls; container: mpegts
Jun 21, 2022 14:03:58.889 [6352] ERROR - [Grabber/cabb5831a86265db15d506f6856667279e424550] Unable to find title for item of type 5
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: analyzing media item -1
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: : no direct play video profile exists for http/mpegts/
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: : no direct play video profile exists for http/mpegts//
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: : codec is unavailable for analysis
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: : codec is unavailable for analysis
Jun 21, 2022 14:03:58.889 [6352] ERROR - [Grabber/cabb5831a86265db15d506f6856667279e424550] Unable to find title for item of type 5
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] MDE: : selected media 0 / -1
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Cleaning directory for session 09057866-ff7c-459e-bc1c-4de525be31e9 ()
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Starting a transcode session 09057866-ff7c-459e-bc1c-4de525be31e9 at offset -1.0 (state=3)
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Streaming Resource: Added session 0EE1AD50:09057866-ff7c-459e-bc1c-4de525be31e9
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] TPU: hardware transcoding: enabled, but no hardware decode accelerator found
Jun 21, 2022 14:03:58.889 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] TPU: hardware transcoding: final decoder: , final encoder:
Jun 21, 2022 14:03:58.890 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550/JobRunner] Job running: set "FFMPEG_EXTERNAL_LIBS=\\\\?\\c\:\\plex\\Plex\ Media\ Server\\Codecs\\d53cb63-4323-windows-x86\\" & set "X_PLEX_TOKEN=xxxxxxxxxxxxxxxxxxxx" & "C:\Program Files (x86)\Plex\Plex Media Server\Plex Transcoder.exe" -noaccurate_seek -ignore_unknown -scan_all_pmts -1 -rw_timeout 30000000 -reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 30 -fflags +discardcorruptts+fillwallclockdts -probesize 20000000 -i http://192.168.1.101:5004/auto/v102 -map 0:V? -codec:V copy -map 0:a? -codec:a copy -map 0:s? -codec:s copy -break_non_keyframes 1 -segment_format mpegts -f ssegment -individual_header_trailer 0 -segment_time 1 -segment_start_number 0 -segment_time_delta 0.25 -segment_list http://127.0.0.1:32400/video/:/transcode/session/09057866-ff7c-459e-bc1c-4de525be31e9/c7f77f27-1614-4dfe-a4cc-e402f2f72630/manifest?X-Plex-Http-Pipeline=infinite -segment_list_type csv -segment_list_size 5 -segment_list_separate_stream_times 1 -segment_list_unfinished 1 -max_delay 5000000 -map_metadata -1 -map_chapters -1 media-%05d.ts -y -nostats -loglevel quiet -loglevel_plex error -xioerror -progressurl http://127.0.0.1:32400/video/:/transcode/session/09057866-ff7c-459e-bc1c-4de525be31e9/c7f77f27-1614-4dfe-a4cc-e402f2f72630/progress
Jun 21, 2022 14:03:58.891 [6352] ERROR - [Grabber/cabb5831a86265db15d506f6856667279e424550] Jobs: failed to start child process C:\Program Files (x86)\Plex\Plex Media Server\Plex Transcoder.exe: CreateProcessW(omitBinary ? NULL : (LPCWSTR)pathify(job->binary).c_str(), (LPWSTR)utf8to16(cmdLine).c_str(), NULL, NULL, TRUE, dwCreationFlags, (LPVOID)env.c_str(), !m_workingDirectory.empty() ? m_workingDirectory.c_str() : NULL, &si, &processInfo): The system cannot find the file specified.
Jun 21, 2022 14:03:58.891 [6352] WARN - [Grabber/cabb5831a86265db15d506f6856667279e424550] TranscodeSession: job runner failed to start
Jun 21, 2022 14:03:58.891 [8424] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Jobs: 'C:\Program Files (x86)\Plex\Plex Media Server\Plex Transcoder.exe' exit code for process 0 is 195948557 (failed to spawn child)
Jun 21, 2022 14:03:58.891 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Streaming Resource: Terminated session 0EE1AD50:09057866-ff7c-459e-bc1c-4de525be31e9 with reason Conversion failed. The transcoder failed to start up.
Jun 21, 2022 14:03:58.891 [6352] ERROR - [Grabber/cabb5831a86265db15d506f6856667279e424550] Failed to start session.
Jun 21, 2022 14:03:58.891 [6352] ERROR - [Grabber/cabb5831a86265db15d506f6856667279e424550] Recorder: Unable to create transcode session or session failed to start.
Jun 21, 2022 14:03:58.891 [6352] DEBUG - [Grabber/cabb5831a86265db15d506f6856667279e424550] Killing job.
Jun 21, 2022 14:03:58.891 [6352] ERROR - [Grabber/cabb5831a86265db15d506f6856667279e424550] Recorder: Error 16 (Recording failed. Please check your tuner or antenna.) starting the record, shutting things down.
