Image Extraction Failed

[burnettm 0]

I'm running Emby Server 4.8.11 on Windows Server 2025 Core. It frequently fails to extract cover.jpg images embedded in .mkv files. The log file is full of entries such as:

2025-09-16 18:17:19.087 Error QuickSingleImageExtractor: QuickSingleImageExtractor.RunExtraction [B6A996C1BCCB]: Error running quick-extract-image -f matroska -threads 1 -i file:"\\file\Videos\TV\Bloodline\S01E04.mkv" -map 0:3 -update 1 -vf "thumbnail=24" -vsync 0 -f image2 "C:\Emby-Server\programdata\cache\temp\07da0018-c66a-4a80-afac-e7b8669db220.jpg"
	*** Error Report ***
	Version: 4.8.11.0
	Command line: C:\Emby-Server\system\EmbyServer.dll
	Operating system: Microsoft Windows 10.0.26100
	Framework: .NET 6.0.36
	OS/Process: x64/x64
	Runtime: C:/Emby-Server/system/System.Private.CoreLib.dll
	Processor count: 2
	Data path: C:\Emby-Server\programdata
	Application path: C:\Emby-Server\system
	System.Exception: System.Exception: Error running ffmpeg quick-extract-image for file:"\\file\Videos\TV\Bloodline\S01E04.mkv" - Command: -f matroska -threads 1 -i file:"\\file\Videos\TV\Bloodline\S01E04.mkv" -map 0:3 -update 1 -vf "thumbnail=24" -vsync 0 -f image2 "C:\Emby-Server\programdata\cache\temp\07da0018-c66a-4a80-afac-e7b8669db220.jpg"
	   at Emby.Server.MediaEncoding.ImageExtraction.ImageExtractorBase.RunExtraction(String inputPath, Nullable`1 container, MediaStream videoStream, Nullable`1 protocol, Nullable`1 streamIndex, Nullable`1 threedFormat, Nullable`1 startOffset, Nullable`1 interval, String targetDirectory, String targetFilename, Nullable`1 maxWidth, Boolean enableThumbnailFilter, CancellationToken cancellationToken)
	Source: Emby.Server.MediaEncoding
	TargetSite: Void MoveNext()

However if I run the ffmpeg command manually it gives me the output:

ffmpeg version 5.1-emby_2023_06_25 Copyright (c) 2000-2022 the FFmpeg developers and softworkz for Emby LLC
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
Execution Date: 2025-09-16 18:28:23
-vsync is deprecated. Use -fps_mode
Passing a number to -vsync is deprecated, use a string argument as described in the manual.
Input #0, matroska,webm, from 'file:\\file\Videos\TV\Bloodline\S01E04.mkv':
  Metadata:
    title           : S01E04
    encoder         : libebml v1.3.4 + libmatroska v1.4.5
    creation_time   : 2017-07-17T12:53:43.000000Z
  Duration: 00:52:39.16, start: 0.000000, bitrate: 11880 kb/s
  Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], Level 41, 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      BPS             : 10368248
      BPS-eng         : 10368248
      DURATION        : 00:52:39.156000000
      DURATION-eng    : 00:52:39.156000000
      NUMBER_OF_FRAMES: 75744
      NUMBER_OF_FRAMES-eng: 75744
      NUMBER_OF_BYTES : 4094364194
      NUMBER_OF_BYTES-eng: 4094364194
  Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default)
    Metadata:
      BPS             : 1508999
      BPS-eng         : 1508999
      DURATION        : 00:52:39.158000000
      DURATION-eng    : 00:52:39.158000000
      NUMBER_OF_FRAMES: 296171
      NUMBER_OF_FRAMES-eng: 296171
      NUMBER_OF_BYTES : 595896052
      NUMBER_OF_BYTES-eng: 595896052
  Stream #0:2(eng): Subtitle: subrip
    Metadata:
      BPS             : 58
      BPS-eng         : 58
      DURATION        : 00:48:40.833000000
      DURATION-eng    : 00:48:40.833000000
      NUMBER_OF_FRAMES: 585
      NUMBER_OF_FRAMES-eng: 585
      NUMBER_OF_BYTES : 21523
      NUMBER_OF_BYTES-eng: 21523
  Stream #0:3: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 1383x2048 [SAR 38:38 DAR 1383:2048], 90k tbr, 90k tbn (attached pic)
    Metadata:
      filename        : cover.jpg
      mimetype        : image/jpeg
Stream mapping:
  Stream #0:3 -> #0:0 (mjpeg (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[Parsed_thumbnail_0 @ 00000232c2666f40] frame id #0 (pts_time=0.000000) selected from a set of 1 images
Output #0, image2, to 'C:\Emby-Server\programdata\cache\temp\07da0018-c66a-4a80-afac-e7b8669db220.jpg':
  Metadata:
    title           : S01E04
    encoder         : Lavf59.27.100
  Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown, progressive), 1383x2048 [SAR 38:38 DAR 1383:2048], q=2-31, 200 kb/s, 90k fps, 90k tbn (attached pic)
    Metadata:
      filename        : cover.jpg
      mimetype        : image/jpeg
      encoder         : Lavc59.37.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
elapsed=00:01:22.24 frame=    1 fps=0.0 q=9.5 Lsize=N/A time=00:00:00.00 bitrate=N/A throttle=off speed=1.34e-07x
video:170kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
EXIT

And the 07da0018-c66a-4a80-afac-e7b8669db220.jpg file is generated successfully

embyserver-63893644290.txt

[Abobader 3464]

Hello burnettm,

** This is an auto reply **

Please wait for someone from staff support or our members to reply to you.

It's recommended to provide more info, as it explain in this thread:

Thank you.

Emby Team

[Luke 42077]

hi, ,this should be resolved in the upcoming 4.9 server release. Thanks.