Jellyfin QSV on a 9700k

Hi there I’ve been attempting to get quick sync video to work on Jellyfin, to little success.I’ve taken a look around at what other people are doing, here are most sources I’ve taken a look at:

Here is the most relevant parts of my configuration (Other parts are stuff to do with directory bind mounts and proxies)

{
  config,
  lib,
  pkgs,
  ...
}:

let
  cfg = config.services.jellyfin;
  user = cfg.user;
in
{
  config = lib.mkIf cfg.enable {
    # Media group allows access to certain directories
    users.users.${user} = {
      extraGroups = [
        "media"
        "video"
        "render"
      ];
    };

    hardware.graphics = {
      enable = true;
      extraPackages = with pkgs; [
        intel-media-driver
        intel-compute-runtime
      ];
    };

    environment.systemPackages = [
      pkgs.jellyfin
      pkgs.jellyfin-web
      pkgs.jellyfin-ffmpeg
    ];

    services.jellyfin = {
      openFirewall = true;
    };
  };
}

This is the current state of my config from which there were many previous attempts, but this is what the Jellyfin service logs are telling me about this config when I attempt to force transcoding from 1080p to 720p.

[16:16:18] [ERR] [9] MediaBrowser.MediaEncoding.Transcoding.TranscodeManager: FFmpeg exited with code 171
[16:16:18] [ERR] [9] Jellyfin.Api.Middleware.ExceptionMiddleware: Error processing request. URL GET /videos/efb056a8-b8d0-5239-38fb-bf4e54534dac/hls1/main/-1.mp4.
MediaBrowser.Common.FfmpegException: FFmpeg exited with code 171
   at MediaBrowser.MediaEncoding.Transcoding.TranscodeManager.StartFfMpeg(StreamState state, String outputPath, String commandLineArguments, Guid userId, TranscodingJobType transcodingJobType, CancellationTokenSource cancellationTokenSource, String workin>
   at Jellyfin.Api.Controllers.DynamicHlsController.GetDynamicSegment(StreamingRequestDto streamingRequest, Int32 segmentId) in /build/source/Jellyfin.Api/Controllers/DynamicHlsController.cs:line 1529
   at Jellyfin.Api.Controllers.DynamicHlsController.GetHlsVideoSegment(Guid itemId, String playlistId, Int32 segmentId, String container, Int64 runtimeTicks, Int64 actualSegmentLengthTicks, Nullable`1 static, String params, String tag, String deviceProfil>
   at lambda_method5587(Closure, Object)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Jellyfin.Api.Middleware.ServerStartupMessageMiddleware.Invoke(HttpContext httpContext, IServerApplicationHost serverApplicationHost, ILocalizationManager localizationManager) in /build/source/Jellyfin.Api/Middleware/ServerStartupMessageMiddleware.cs>
   at Jellyfin.Api.Middleware.WebSocketHandlerMiddleware.Invoke(HttpContext httpContext, IWebSocketManager webSocketManager) in /build/source/Jellyfin.Api/Middleware/WebSocketHandlerMiddleware.cs:line 33
   at Jellyfin.Api.Middleware.IPBasedAccessValidationMiddleware.Invoke(HttpContext httpContext, INetworkManager networkManager) in /build/source/Jellyfin.Api/Middleware/IpBasedAccessValidationMiddleware.cs:line 41
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Jellyfin.Api.Middleware.QueryStringDecodingMiddleware.Invoke(HttpContext httpContext) in /build/source/Jellyfin.Api/Middleware/QueryStringDecodingMiddleware.cs:line 36
   at Swashbuckle.AspNetCore.ReDoc.ReDocMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Jellyfin.Api.Middleware.RobotsRedirectionMiddleware.Invoke(HttpContext httpContext) in /build/source/Jellyfin.Api/Middleware/RobotsRedirectionMiddleware.cs:line 43
   at Jellyfin.Api.Middleware.LegacyEmbyRouteRewriteMiddleware.Invoke(HttpContext httpContext) in /build/source/Jellyfin.Api/Middleware/LegacyEmbyRouteRewriteMiddleware.cs:line 51
   at Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.InvokeCore(HttpContext context)
   at Jellyfin.Api.Middleware.ResponseTimeMiddleware.Invoke(HttpContext context, IServerConfigurationManager serverConfigurationManager) in /build/source/Jellyfin.Api/Middleware/ResponseTimeMiddleware.cs:line 66
   at Jellyfin.Api.Middleware.ExceptionMiddleware.Invoke(HttpContext context) in /build/source/Jellyfin.Api/Middleware/ExceptionMiddleware.cs:line 55

At this point I think I’m starting to loose my marbles. As the title would suggest this is for a system that has a 9700k. Where am I going wrong?

My guess this is most likely a jellyfin configuration issue, could you please share the Transcode Log ?
(Should be in the Browser under Dashboard → Logs → Starts with FFmpeg.Transcode )
The Transcode log usually has more Information what went wrong

You may need to set the environment variables - this solved a recent similar issue for me.

My config includes:

  #https://wiki.nixos.org/wiki/Accelerated_Video_Playback
  hardware.graphics = {
    enable = true;
    extraPackages = with pkgs; [
      intel-media-driver # For Broadwell (2014) or newer processors. LIBVA_DRIVER_NAME=iHD
    ];
  };
  environment.sessionVariables = { LIBVA_DRIVER_NAME = "iHD"; };
  systemd.services.jellyfin.environment.LIBVA_DRIVER_NAME = "iHD";
{"Protocol":0,"Id":"efb056a8b8d0523938fbbf4e54534dac","Path":"/services/libraries/curated/Films/Avatar (2009)/Avatar (2009).mkv","EncoderPath":null,"EncoderProtocol":null,"Type":0,"Container":"mkv","Size":44388790640,"Name":"Avatar (2009)","IsRemote":false,"ETag":"2cc41ec57a6cde0a137a50276425bd67","RunTimeTicks":97016960000,"ReadAtNativeFramerate":false,"IgnoreDts":false,"IgnoreIndex":false,"GenPtsInput":false,"SupportsTranscoding":true,"SupportsDirectStream":true,"SupportsDirectPlay":true,"IsInfiniteStream":false,"UseMostCompatibleTranscodingProfile":false,"RequiresOpening":false,"OpenToken":null,"RequiresClosing":false,"LiveStreamId":null,"BufferMs":null,"RequiresLooping":false,"SupportsProbing":true,"VideoType":0,"IsoType":null,"Video3DFormat":null,"MediaStreams":[{"Codec":"h264","CodecTag":null,"Language":"eng","ColorRange":null,"ColorSpace":null,"ColorTransfer":null,"ColorPrimaries":null,"DvVersionMajor":null,"DvVersionMinor":null,"DvProfile":null,"DvLevel":null,"RpuPresentFlag":null,"ElPresentFlag":null,"BlPresentFlag":null,"DvBlSignalCompatibilityId":null,"Rotation":null,"Comment":null,"TimeBase":"1/1000","CodecTimeBase":null,"Title":null,"Hdr10PlusPresentFlag":null,"VideoRange":1,"VideoRangeType":1,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":null,"LocalizedForced":null,"LocalizedExternal":null,"LocalizedHearingImpaired":null,"DisplayTitle":"1080p H264 SDR","NalLengthSize":"4","IsInterlaced":false,"IsAVC":true,"ChannelLayout":null,"BitRate":36602912,"BitDepth":8,"RefFrames":1,"PacketLength":null,"Channels":null,"SampleRate":null,"IsDefault":false,"IsForced":false,"IsHearingImpaired":false,"Height":1080,"Width":1920,"AverageFrameRate":23.976025,"RealFrameRate":23.976025,"ReferenceFrameRate":23.976025,"Profile":"High","Type":1,"AspectRatio":"16:9","Index":0,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Path":null,"PixelFormat":"yuv420p","Level":41,"IsAnamorphic":false},{"Codec":"dts","CodecTag":null,"Language":"eng","ColorRange":null,"ColorSpace":null,"ColorTransfer":null,"ColorPrimaries":null,"DvVersionMajor":null,"DvVersionMinor":null,"DvProfile":null,"DvLevel":null,"RpuPresentFlag":null,"ElPresentFlag":null,"BlPresentFlag":null,"DvBlSignalCompatibilityId":null,"Rotation":null,"Comment":null,"TimeBase":"1/1000","CodecTimeBase":null,"Title":"Surround 5.1","Hdr10PlusPresentFlag":null,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":"Default","LocalizedForced":null,"LocalizedExternal":"External","LocalizedHearingImpaired":null,"DisplayTitle":"Surround 5.1 - English - DTS-HD MA - Default","NalLengthSize":null,"IsInterlaced":false,"IsAVC":false,"ChannelLayout":"5.1","BitRate":4145615,"BitDepth":24,"RefFrames":null,"PacketLength":null,"Channels":6,"SampleRate":48000,"IsDefault":true,"IsForced":false,"IsHearingImpaired":false,"Height":null,"Width":null,"AverageFrameRate":null,"RealFrameRate":null,"ReferenceFrameRate":null,"Profile":"DTS-HD MA","Type":0,"AspectRatio":null,"Index":1,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Path":null,"PixelFormat":null,"Level":0,"IsAnamorphic":null},{"Codec":"dts","CodecTag":null,"Language":"eng","ColorRange":null,"ColorSpace":null,"ColorTransfer":null,"ColorPrimaries":null,"DvVersionMajor":null,"DvVersionMinor":null,"DvProfile":null,"DvLevel":null,"RpuPresentFlag":null,"ElPresentFlag":null,"BlPresentFlag":null,"DvBlSignalCompatibilityId":null,"Rotation":null,"Comment":null,"TimeBase":"1/1000","CodecTimeBase":null,"Title":"Surround 5.1","Hdr10PlusPresentFlag":null,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":"Default","LocalizedForced":null,"LocalizedExternal":"External","LocalizedHearingImpaired":null,"DisplayTitle":"Surround 5.1 - English - DTS","NalLengthSize":null,"IsInterlaced":false,"IsAVC":false,"ChannelLayout":"5.1","BitRate":1536000,"BitDepth":null,"RefFrames":null,"PacketLength":null,"Channels":6,"SampleRate":48000,"IsDefault":false,"IsForced":false,"IsHearingImpaired":false,"Height":null,"Width":null,"AverageFrameRate":null,"RealFrameRate":null,"ReferenceFrameRate":null,"Profile":"DTS","Type":0,"AspectRatio":null,"Index":2,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Path":null,"PixelFormat":null,"Level":0,"IsAnamorphic":null},{"Codec":"ac3","CodecTag":null,"Language":"eng","ColorRange":null,"ColorSpace":null,"ColorTransfer":null,"ColorPrimaries":null,"DvVersionMajor":null,"DvVersionMinor":null,"DvProfile":null,"DvLevel":null,"RpuPresentFlag":null,"ElPresentFlag":null,"BlPresentFlag":null,"DvBlSignalCompatibilityId":null,"Rotation":null,"Comment":null,"TimeBase":"1/1000","CodecTimeBase":null,"Title":"Stereo","Hdr10PlusPresentFlag":null,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":"Default","LocalizedForced":null,"LocalizedExternal":"External","LocalizedHearingImpaired":null,"DisplayTitle":"Stereo - English - Dolby Digital","NalLengthSize":null,"IsInterlaced":false,"IsAVC":false,"ChannelLayout":"stereo","BitRate":224000,"BitDepth":null,"RefFrames":null,"PacketLength":null,"Channels":2,"SampleRate":48000,"IsDefault":false,"IsForced":false,"IsHearingImpaired":false,"Height":null,"Width":null,"AverageFrameRate":null,"RealFrameRate":null,"ReferenceFrameRate":null,"Profile":null,"Type":0,"AspectRatio":null,"Index":3,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Path":null,"PixelFormat":null,"Level":0,"IsAnamorphic":null},{"Codec":"ac3","CodecTag":null,"Language":"eng","ColorRange":null,"ColorSpace":null,"ColorTransfer":null,"ColorPrimaries":null,"DvVersionMajor":null,"DvVersionMinor":null,"DvProfile":null,"DvLevel":null,"RpuPresentFlag":null,"ElPresentFlag":null,"BlPresentFlag":null,"DvBlSignalCompatibilityId":null,"Rotation":null,"Comment":null,"TimeBase":"1/1000","CodecTimeBase":null,"Title":"Surround 5.1","Hdr10PlusPresentFlag":null,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":"Default","LocalizedForced":null,"LocalizedExternal":"External","LocalizedHearingImpaired":null,"DisplayTitle":"Surround 5.1 - 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PGSSUB","NalLengthSize":null,"IsInterlaced":false,"IsAVC":false,"ChannelLayout":null,"BitRate":null,"BitDepth":null,"RefFrames":null,"PacketLength":null,"Channels":null,"SampleRate":null,"IsDefault":false,"IsForced":false,"IsHearingImpaired":false,"Height":0,"Width":0,"AverageFrameRate":null,"RealFrameRate":null,"ReferenceFrameRate":null,"Profile":null,"Type":2,"AspectRatio":null,"Index":11,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":true,"Path":null,"PixelFormat":null,"Level":0,"IsAnamorphic":null},{"Codec":"PGSSUB","CodecTag":null,"Language":"fra","ColorRange":null,"ColorSpace":null,"ColorTransfer":null,"ColorPrimaries":null,"DvVersionMajor":null,"DvVersionMinor":null,"DvProfile":null,"DvLevel":null,"RpuPresentFlag":null,"ElPresentFlag":null,"BlPresentFlag":null,"DvBlSignalCompatibilityId":null,"Rotation":null,"Comment":null,"TimeBase":"1/1000","CodecTimeBase":null,"Title":null,"Hdr10PlusPresentFlag":null,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":"Undefined","LocalizedDefault":"Default","LocalizedForced":"Forced","LocalizedExternal":"External","LocalizedHearingImpaired":"Hearing Impaired","DisplayTitle":"French - 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/nix/store/1f2nvyz7cfalm8q38fbrba7j6155jnc2-jellyfin-ffmpeg-7.1.2-2-bin/bin/ffmpeg -analyzeduration 200M -probesize 1G -f matroska -init_hw_device vaapi=va:/dev/dri/renderD128,driver=iHD -init_hw_device qsv=qs@va -filter_hw_device qs -hwaccel qsv -hwaccel_output_format qsv -noautorotate -c:v h264_qsv -i file:"/services/libraries/curated/Films/Avatar (2009)/Avatar (2009).mkv" -noautoscale -map_metadata -1 -map_chapters -1 -threads 0 -map 0:0 -map 0:3 -map -0:s -codec:v:0 libx264 -preset veryfast -crf 23 -maxrate 19776000 -bufsize 39552000 -profile:v:0 high -level 41 -x264opts:0 subme=0:me_range=16:rc_lookahead=10:me=hex:open_gop=0 -force_key_frames:0 "expr:gte(t,n_forced*3)" -sc_threshold:v:0 0 -vf "setparams=color_primaries=bt709:color_trc=bt709:colorspace=bt709,vpp_qsv=format=nv12,hwdownload,format=nv12" -codec:a:0 copy -copyts -avoid_negative_ts disabled -max_muxing_queue_size 2048 -f hls -max_delay 5000000 -hls_time 3 -hls_segment_type fmp4 -hls_fmp4_init_filename "f9bcaeaf10f17a1a8bf45dcfc1d10514-1.mp4" -start_number 0 -hls_segment_filename "/services/jellyfin/cache/transcodes/f9bcaeaf10f17a1a8bf45dcfc1d10514%d.mp4" -hls_playlist_type vod -hls_list_size 0 -hls_segment_options movflags=+frag_discont -y "/services/jellyfin/cache/transcodes/f9bcaeaf10f17a1a8bf45dcfc1d10514.m3u8"


ffmpeg version 7.1.2-Jellyfin Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.3.0 (GCC)
  configuration: --disable-static --prefix=/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-jellyfin-ffmpeg-7.1.2-2 --target_os=linux --arch=x86_64 --pkg-config=pkg-config --enable-gpl --enable-version3 --disable-nonfree --disable-static --enable-shared --enable-pic --disable-thumb --disable-small --enable-runtime-cpudetect --enable-gray --enable-swscale-alpha --enable-hardcoded-tables --enable-safe-bitstream-reader --enable-pthreads --disable-w32threads --disable-os2threads --enable-network --enable-pixelutils --datadir=/nix/store/rmy84lf2ndhcx2zf822x5bgsmfap9f4s-jellyfin-ffmpeg-7.1.2-2-data/share/ffmpeg --enable-ffmpeg --enable-ffplay --enable-ffprobe --bindir=/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-jellyfin-ffmpeg-7.1.2-2-bin/bin --enable-avcodec --enable-avdevice --enable-avfilter --enable-avformat --enable-avutil --enable-postproc --enable-swresample --enable-swscale --libdir=/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-jellyfin-ffmpeg-7.1.2-2-lib/lib --incdir=/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-jellyfin-ffmpeg-7.1.2-2-dev/include --enable-doc --enable-htmlpages --enable-manpages --mandir=/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-jellyfin-ffmpeg-7.1.2-2-man/share/man --enable-podpages --enable-txtpages --docdir=/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-jellyfin-ffmpeg-7.1.2-2-doc/share/doc/ffmpeg --enable-alsa --enable-amf --enable-libaom --enable-libaribb24 --enable-libaribcaption --enable-libass --enable-avisynth --enable-libbluray --enable-libbs2b --enable-bzlib --enable-libcaca --enable-libcdio --enable-libcelt --enable-chromaprint --enable-libcodec2 --enable-cuda --enable-cuda-llvm --disable-cuda-nvcc --enable-cuvid --enable-libdav1d --enable-libdavs2 --enable-libdc1394 --enable-libdrm --enable-libdvdnav --enable-libdvdread --disable-libfdk-aac --enable-ffnvcodec --enable-libflite --enable-fontconfig --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libfribidi --enable-libgme --enable-gmp --enable-gnutls --enable-libgsm --enable-libharfbuzz --enable-iconv --enable-libilbc --enable-libjack --enable-libjxl --enable-libkvazaar --enable-ladspa --enable-liblc3 --enable-liblcevc-dec --enable-lcms2 --enable-lzma --disable-metal --disable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libmysofa --disable-libnpp --enable-nvdec --enable-nvenc --enable-openal --enable-opencl --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-opengl --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-libqrencode --enable-libquirc --enable-librav1e --enable-librist --disable-librtmp --enable-librubberband --enable-libsmbclient --enable-sdl2 --enable-libshaderc --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-librsvg --enable-libsvtav1 --disable-libtensorflow --enable-libtheora --enable-libtwolame --enable-libuavs3d --enable-libv4l2 --enable-v4l2-m2m --enable-vaapi --enable-vdpau --enable-libvpl --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-vulkan --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxavs2 --enable-libxcb --enable-libxcb-shape --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxevd --enable-libxeve --enable-xlib --enable-libxml2 --enable-libxvid --enable-libzimg --enable-zlib --enable-libzmq --enable-libzvbi --disable-debug --enable-optimizations --disable-extra-warnings --disable-stripping --extra-version=Jellyfin --disable-ptx-compression
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
libva info: VA-API version 1.22.0
libva info: User environment variable requested driver 'iHD'
libva info: Trying to open /run/opengl-driver/lib/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_22
libva info: va_openDriver() returns 0
[AVHWDeviceContext @ 0x55ef77338100] Error creating a MFX session: -9.
[AVHWDeviceContext @ 0x55ef77338100] Error initializing an MFX session: -3.
Device creation failed: -1313558101.
Failed to set value 'qsv=qs@va' for option 'init_hw_device': Unknown error occurred
Error parsing global options: Unknown error occurred

Here you go

Just as a sanity check, I’ve just doubled checked, but I’m still getting the same errors as before.

Looks like the video drivers aren’t being loaded. Are you using the appropriate nixos-hardware modules for your system?

As far as i’m aware, QSV is only supported on that chip with the deprecated end-of-life intel-media-sdk package. VAAPI works fine with Jellyfin though.

Also you’ll want intel-compute-runtime-legacy1 rather than intel-compute-runtime for that chip.

according to GitHub - intel/libvpl: Intel® Video Processing Library (Intel® VPL) API, dispatcher, and examples
you need the intel-media-sdk driver for qsv (9700K is Coffee Lake and its the predecessor to Ice Lake)
But as aloop said using VAAPI should also be fine