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I am reporting a reproducible HLS playback issue in Emby Server 4.9.5.0. The issue happens when playing a video through Emby Web using HLS, especially when resuming playback from a saved position in the middle of the video, or after manually seeking to another position. If I start the same video from the beginning, playback usually works normally and the subtitles stay in sync. The problem appears only after resume/seek playback in the HLS remux/transcode path. The most visible symptom is that hls.js reports repeated non-fatal media errors such as: HLS Error: Type: mediaError Details: bufferSeekOverHole Fatal: false Reason: fragment loaded with buffer holes, seeking from 887.327815 to 888.6159769999999 After these HLS errors appear, playback no longer behaves as if the video, audio, and subtitle clocks are aligned. Subtitles may become discontinuous or jump in timing, and they no longer match the spoken audio or video scene. In my tests, the subtitles often become ahead of the video by around 1.6 seconds, but the offset is not always exactly the same. Sometimes the video/audio timeline also appears to shift after the buffer hole recovery, which makes the subtitle timing incorrect even though the subtitle file itself is valid. This does not look like a general subtitle file problem. The same media can play correctly from the beginning. The desync is triggered by HLS resume/seek behavior and usually appears after hls.js reports bufferSeekOverHole. In some tests, seeking also caused playback to fail completely with the client message: No compatible streams are currently available. Please try again later or contact your system administrator for details. From the server-side ffmpeg logs, the affected playback sessions use segmented HLS output with arguments such as: -copyts -start_at_zero -ss <resume position> -segment_time 00:00:06.000 -segment_time_delta -<resume offset> -segment_start_number <non-zero segment index> -segment_format mpegts The issue seems related to the generated HLS timeline after resume/seek, because hls.js detects buffer holes in the loaded fragments and performs an internal seek over the hole. After that recovery seek, subtitle timing is no longer reliable. Expected behavior: Resume playback and manual seeking should continue normally without HLS buffer holes, without subtitle timing discontinuity, and without A/V/subtitle desync. Starting playback from a saved position should behave the same as starting from the beginning and then seeking naturally. Actual behavior: When resuming or seeking during HLS playback, hls.js may report bufferSeekOverHole. After that, subtitles can become early or otherwise misaligned with the video/audio. In some cases playback fails with “No compatible streams”. Environment: Emby Server: 4.9.5.0 Client: Emby Web Browser: Microsoft Edge / Chromium-based browser Playback: HLS via hls.js Container: MKV Video: HEVC Main 10 Audio: OPUS source, remux/transcode path may convert audio Subtitles: ASS subtitles, including internal/external ASS tracks Trigger: resume from saved position or manual seek Starting from 0:00: usually works correctly I have attached anonymized logs from the affected playback attempts: embyserver.anonymized.txt ffmpeg-remux-resume-1.anonymized.txt ffmpeg-remux-resume-2.anonymized.txt The logs preserve the relevant HLS/ffmpeg details such as the ffmpeg command line, segment start number, segment timing options, HLS segment responses, Content-Length, and SegmentComplete entries. Private paths, IP addresses, hostnames, tokens, session IDs, media titles, and user identifiers have been anonymized. embyserver.anonymized.txt ffmpeg-remux-resume-1.anonymized.txt ffmpeg-remux-resume-2.anonymized.txt

A port checking site. Rebooting the router has resolved the issue.

No, what would be the order of the processes? Do I use the script and then run "Scan media library"?

Maybe this is your issue? 2026-05-30 09:38:00.006 Error UniversalAudioService-0HNLS95NDSS62:00000001: Error processing request *** Error Report *** Version: 4.9.3.0 Command line: /Volume1/@apps/emby/emby-server/system/EmbyServer.dll -programdata /Volume1/Emby -ffdetect /Volume1/@apps/emby/emby-server/bin/ffdetect -ffmpeg /Volume1/@apps/emby/emby-server/bin/ffmpeg -ffprobe /Volume1/@apps/emby/emby-server/bin/ffprobe -defaultdirectory /mnt/public -updatepackage emby_TOS5_APP_{version}_x86_64.tpk Operating system: Linux version 6.1.120+ (root@51f02058744a) (x86_64-tnas-linux-gnu-gcc.br_real (Buildroot 2023.08.1) 13.2.0, GNU ld (GNU Binutils) 2.40) #52 SMP PREEMP OS/Process: x64/x64 Framework: .NET 8.0.22 Runtime: Volume1/@apps/emby/emby-server/system/System.Private.CoreLib.dll Processor count: 8 Data path: /Volume1/Emby Application path: /Volume1/@apps/emby/emby-server/system System.UnauthorizedAccessException: System.UnauthorizedAccessException: Access to the path '/Volume1/GaDo_Storage1/MediaSource/Music/Andrea Bocelli/Passione (Super Deluxe Edition)/Love Me Tender.mp3' is denied. ---> System.IO.IOException: Permission denied The server is being denied access to the file. Can you get this corrected and then try again?

No, it should work either way. But it likely will not work if these folders are also used in other libraries.

You can also jump in and help translate if you want.

HI, we are looking into this. Thanks.

have you checked out the scan metadata folder scheduled task?

OK yes it is certainly doable. Thanks.

Hi, have you updated to Emby Server 4.9.5? Has that helped?

Hi there, please attach the Emby server log from when the problem occurred: How to Report a Problem Thanks!

Thanks for following up.

Hi, what exactly makes you think the table view does not help? What exactly did you try to do with it?

HI there, can you please provide a specific example? How to Report a Problem Thanks !

Hi, have you explored your emby user home screen options?

Hi, I would try refreshing the metadata on them and see if that helps. Is the path to the media still the same on the new server?

Sorry, my mistake. Until there are field-specific options of what to import, you'd have to just disable internet metadata.

Hi there, let's look at an example. Please attach the information requested in how to report a media playback issue. Thanks!

have you configured the startup behavior option in the app? is your browser clearing browsing data?

Hi, we'll take a look at it. Thanks for reporting.

Hi, how did you get the data imported into emby server?

Hi, what is random album radio?

Hi, no, but it's a possible option for future updates. Thanks.

hi, why not? what exactly happens when you try?