Plex Unexpected Playback issue - Synology NAS

Server Version#: 1.23.2.4656
Player Version#:

Hi I am having an issue where whenever I play anything either locally or remotely after a while the video buffers and then I get an unexpected playback error. I then have to restart the plex player - this happens across Native Samsung TV, Apple TV app. I’ve attached logs - I have seen a lot of SSDP entries in the log and also getting client profile errors. I’m not too sure what the issue is. I’m also using an ASUS ZenWifi XT8 mesh system with the NAS server connected via Ethernet to the router. No issues on the internet side - does my plex system need a complete reset etc? I also have seen a lot of transcode entries although everything can be direct played. Hoping
Plex Media Server Logs_2021-06-19_20-09-42.zip (5.4 MB)
someone can help.

Plex Media Server Logs_2021-06-08_22-14-22.zip (4.4 MB)

  1. No Plex / NAS reset.
  2. If you’re having stuttering problems, it’s often the subtitle burning bur I’m not overtly seeing subtitle burning here. I do see the hardware transcoding is disabled which is a strong indicator they are being burned-in (Player settings requesting it)
Jun 17, 2021 22:01:11.849 [0x7f1cb43dfb38] DEBUG - [Transcode] Downloading document http://127.0.0.1:32400/library/metadata/13148?checkFiles=1&includeBandwidths=1&offset=3031&X-Plex-Incomplete-Segments=1&X-Plex-Session-Identifier=nc64le0gh9b53aoi6fwm6lxr
Jun 17, 2021 22:01:11.850 [0x7f1cb43dfb38] DEBUG - [Transcode] Auth: authenticated user 1 as Ifran and Sarah
Jun 17, 2021 22:01:11.867 [0x7f1cb43dfb38] DEBUG - [Transcode] We're going to try to auto-select an audio stream for account 1.
Jun 17, 2021 22:01:11.867 [0x7f1cb43dfb38] DEBUG - [Transcode] Selecting best audio stream for part ID 16908 (autoselect: 1 language: en)
Jun 17, 2021 22:01:11.867 [0x7f1cb43dfb38] DEBUG - [Transcode] Audio Stream: 32122, Subtitle Stream: 32123
Jun 17, 2021 22:01:11.869 [0x7f1cb43dfb38] DEBUG - [Transcode] Destroying existing session, reference count = 4
Jun 17, 2021 22:01:11.869 [0x7f1cb43dfb38] DEBUG - [Transcode] Cleaning directory for session r5qh4i3iy6ahm882idg3nmi3 ()
Jun 17, 2021 22:01:11.869 [0x7f1cb43dfb38] DEBUG - [Transcode] Killing job.
Jun 17, 2021 22:01:11.869 [0x7f1cb43dfb38] DEBUG - [Transcode] Signalling job ID 15236 with 9
Jun 17, 2021 22:01:11.869 [0x7f1cb43dfb38] DEBUG - [Transcode] Job was already killed, not killing again.
Jun 17, 2021 22:01:11.869 [0x7f1cb43dfb38] DEBUG - [Transcode] Stopping transcode session r5qh4i3iy6ahm882idg3nmi3
Jun 17, 2021 22:01:11.869 [0x7f1cb447eb38] DEBUG - [Transcode] Cleaning directory for session r5qh4i3iy6ahm882idg3nmi3 (/volume1/Plex/Library/Application Support/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-r5qh4i3iy6ahm882idg3nmi3-f435e66b-b9b9-4255-adf1-5900a236e93f)
Jun 17, 2021 22:01:11.872 [0x7f1cb43dfb38] DEBUG - [Transcode] Starting a transcode session r5qh4i3iy6ahm882idg3nmi3 at offset -1.0 (state=3)
Jun 17, 2021 22:01:11.872 [0x7f1cb3e53b38] DEBUG - [Transcode] Job was already killed, not killing again.
Jun 17, 2021 22:01:11.872 [0x7f1cb3e53b38] DEBUG - [Transcode] Job was already killed, not killing again.
Jun 17, 2021 22:01:11.872 [0x7f1cb3e53b38] DEBUG - [Transcode] Whacked session r5qh4i3iy6ahm882idg3nmi3, 1 remaining.
Jun 17, 2021 22:01:11.872 [0x7f1cb43dfb38] DEBUG - [Transcode] [Universal] Using local file path instead of URL: /volume1/video/Plex/TV Shows/Loki/Season 1/Loki.S01E02.The.Variant.2160p.WEB-DL.x265.10bit.HDR.DDP5.1.Atmos-SWTYBLZ/Loki.S01E02.The.Variant.2160p.WEB-DL.x265.10bit.HDR.DDP5.1.Atmos-SWTYBLZ.mkv
Jun 17, 2021 22:01:11.873 [0x7f1cb43dfb38] DEBUG - [Transcode/JobRunner] Job running: FFMPEG_EXTERNAL_LIBS='/volume1/Plex/Library/Application\ Support/Plex\ Media\ Server/Codecs/fa235d6-3858-linux-x86_64/' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/volume1/@appstore/Plex Media Server/Plex Transcoder' '-ss' '3031' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/volume1/video/Plex/TV Shows/Loki/Season 1/Loki.S01E02.The.Variant.2160p.WEB-DL.x265.10bit.HDR.DDP5.1.Atmos-SWTYBLZ/Loki.S01E02.The.Variant.2160p.WEB-DL.x265.10bit.HDR.DDP5.1.Atmos-SWTYBLZ.mkv' '-map' '0:2' '-metadata:s:0' 'language=eng' '-codec:0' 'copy' '-f' 'segment' '-segment_format' 'srt' '-segment_time' '1' '-segment_header_filename' 'header' '-segment_start_number' '0' '-segment_list' 'http://127.0.0.1:32400/video/:/transcode/session/r5qh4i3iy6ahm882idg3nmi3/e05f9394-0bc9-477d-9cb3-1b254431f0a1/manifest?X-Plex-Http-Pipeline=infinite' '-segment_list_type' 'csv' '-segment_list_unfinished' '1' '-segment_list_size' '5' '-segment_list_separate_stream_times' '1' '-avoid_negative_ts' 'disabled' '-map_metadata' '-1' '-map_chapters' '-1' 'chunk-%05d' '-start_at_zero' '-copyts' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/r5qh4i3iy6ahm882idg3nmi3/e05f9394-0bc9-477d-9cb3-1b254431f0a1/progress'
Jun 17, 2021 22:01:11.874 [0x7f1cb43dfb38] DEBUG - [Transcode/JobRunner] Jobs: Starting child process with pid 15245
Jun 17, 2021 22:01:11.878 [0x7f1cb42c8b38] DEBUG - Request: [127.0.0.1:59360 (Loopback)] PUT /video/:/transcode/session/r5qh4i3iy6ahm882idg3nmi3/e05f9394-0bc9-477d-9cb3-1b254431f0a1/progress?status=startup (7 live) Signed-in Token (Ifran and Sarah) (range: bytes=0-) 
  1. SSDP - your devices on the LAN are noisy. It is harmless but still disconcerting if you don’t know what they’re doing. (Plex makes a poll, they respond when they shouldn’t. Plex tried to talk. They get ugly. Plex says “OK FINE!” lol.

Try turning off subtitles or playing something without them. (Synology does not do well with anything containing subtitles. You must curate subtitles carefully in order to have success due to the limited CPU power)

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