Plex is skipping forward randomly

Server Version#: 1.32.6.7557
Player Version#: 4.117.3
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

when i play it on chrome browser..
it skips forward randomly..
really annoying… i paid plex pass…and what is happening to me ??
when i checked “Use alternate streaming protocol for video playback”
i just got a black screen with audio..
plz help me..

Please provide the server DEBUG logs which capture a playback.
This will let us see , at least some of, what’s happening.

playback_logs.txt (12.3 KB)

when i play Blue.Beetle.2023.2160p.WEB.h265-ETHEL[TGx].mkv

it keeps skipping at 10:51 → 10:56

You gave me almost nothing to look at.

  1. The first thing I see after the transcoder launches is a player seek
Oct 29, 2023 12:18:46.526 [140114149010232] DEBUG - [Req#cfb31/Transcode/rbx1f87vyu9wjlrymha7p8zq/JobRunner] Job running: EAE_ROOT=/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/tmp/pms-1ed89e36-f82d-4aba-a749-a1d66082164b/EasyAudioEncoder FFMPEG_EXTERNAL_LIBS='/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex\ Media\ Server/Codecs/a31c019-4614-linux-x86_64/' X_PLEX_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "/volume2/@appstore/PlexMediaServer/Plex Transcoder" -codec:0 hevc -codec:1 eac3_eae -eae_prefix:1 rbx1f87vyu9wjlrymha7p8zq_ -ss 635 -noaccurate_seek -analyzeduration 20000000 -probesize 20000000 -i '/volume2/sg16tb0/00-영화/Blue Beetle (2023)/Blue.Beetle.2023.2160p.WEB.h265-ETHEL[TGx].mkv' -ss 635 -noaccurate_seek -analyzeduration 20000000 -probesize 20000000 -i "/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-rbx1f87vyu9wjlrymha7p8zq-05354bb1-cd75-477c-839d-89ea3013f189/temp-0.srt" -map 0:0 -metadata:s:0 language=eng -codec:0 copy -filter_complex "[0:1] aresample=async=1:ochl='stereo':rematrix_maxval=60.000000dB:osr=48000[0]" -map "[0]" -metadata:s:1 language=eng -codec:1 aac -b:1 256k -f dash -seg_duration 5 -dash_segment_type mp4 -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 128 -time_delta 0.0625 -manifest_name "http://127.0.0.1:32400/video/:/transcode/session/rbx1f87vyu9wjlrymha7p8zq/05354bb1-cd75-477c-839d-89ea3013f189/manifest?X-Plex-Http-Pipeline=infinite" -avoid_negative_ts disabled -map_metadata -1 -map_chapters -1 dash -map 1:s:0 -metadata:s:0 language=kor -codec:0 ass -strict_ts:0 0 -f segment -segment_format ass -segment_time 1 -segment_header_filename sub-header -segment_start_number 0 -segment_list "http://127.0.0.1:32400/video/:/transcode/session/rbx1f87vyu9wjlrymha7p8zq/05354bb1-cd75-477c-839d-89ea3013f189/manifest?stream=subtitles&X-Plex-Http-Pipeline=infinite" -segment_list_type csv -segment_list_size 5 -segment_list_separate_stream_times 1 -segment_format_options ignore_readorder=1 -segment_list_unfinished 1 -fflags +flush_packets "sub-chunk-%05d" -start_at_zero -copyts -y -nostats -loglevel quiet -loglevel_plex error -progressurl http://127.0.0.1:32400/video/:/transcode/session/rbx1f87vyu9wjlrymha7p8zq/05354bb1-cd75-477c-839d-89ea3013f189/progress
Oct 29, 2023 12:18:46.526 [140114149010232] DEBUG - [Req#cfb31/Transcode/rbx1f87vyu9wjlrymha7p8zq/JobRunner] In directory: "/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-rbx1f87vyu9wjlrymha7p8zq-05354bb1-cd75-477c-839d-89ea3013f189"
Oct 29, 2023 12:18:46.527 [140114149010232] DEBUG - [Req#cfb31/Transcode/rbx1f87vyu9wjlrymha7p8zq/JobRunner] Jobs: Starting child process with pid 18369
Oct 29, 2023 12:18:46.528 [140114261797688] DEBUG - Completed: [210.105.61.116:5796] 200 GET /status/sessions (10 live) #cfb2b TLS GZIP 10ms 4936 bytes (pipelined: 1)
Oct 29, 2023 12:18:46.528 [140114149010232] DEBUG - [Req#cfb31/Transcode/rbx1f87vyu9wjlrymha7p8zq] Started session successfully: rbx1f87vyu9wjlrymha7p8zq
Oct 29, 2023 12:18:46.528 [140114102647608] DEBUG - [Req#cfb31/Transcode/rbx1f87vyu9wjlrymha7p8zq] Streaming Resource: Resetting play progress due to seek
Oct 29, 2023 12:18:46.531 [140114117368632] DEBUG - Request: [127.0.0.1:47380 (Loopback)] PUT /video/:/transcode/session/rbx1f87vyu9wjlrymha7p8zq/05354bb1-cd75-477c
  1. The entire log excerpt spans less than 1 second

  2. The timestamp in the file is Oct 29, 2023 12:18:46.526 and not the referenced 10:51.

Please try again and also pleases do cover from start until skip.
All I see here is the player itself commanding a SEEK

Plex Media Server Logs_2023-10-29_20-46-26.zip (793.3 KB)

please take a look…

Thank you for the logs.

Now I can see you’re using a Synology NAS and have subtitles involved.
I understand why you’re having difficulty.

Synology NAS processors aren’t the strongest when subtitles are involved.

We are having difficulty with ASS subtitles and have a fix for that in the upcoming PMS 1.32.8 release.

Would you mind retrying when that is released this coming week?

ok thank you . ill try

i updated to 1.32.8.7639…
and did refresh metadata and optimized database.
same again.
it skipping again…