2025-01-05, 10:07 PM
Here is a FFmpeg log:
There is indeed somthing strange here :
Why does Jellyfin transcode the audio track to aac?
Is this the normal behavior of Jellyfin? My Unraid server has very limited hardware and is only used as a storage server for MKV files. It's not designed for transcoding (my Zidoo media player handles the video decoding, and my amplifier handles the audio).
However, when I stream, Jellyfin shows "Direct Play - The source file is fully compatible with this client, and the session is receiving the file without modifications."
I don't really understand what's going on here...
Code:
{"Protocol":0,"Id":"78581c97515558a5a300fa8c21d61c87","Path":"/media/Films 3D/Dragon 2 3D.mkv","EncoderPath":null,"EncoderProtocol":null,"Type":0,"Container":"mkv","Size":13528042633,"Name":"Dragon 2 3D","IsRemote":false,"ETag":"1e70e085a33453b92008206183811ef8","RunTimeTicks":61151160000,"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":"dts","CodecTag":null,"Language":"fre","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,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":"Par d\u00E9faut","LocalizedForced":null,"LocalizedExternal":"Externe","LocalizedHearingImpaired":null,"DisplayTitle":"Fre - DTS - 5.1 - Par d\u00E9faut","NalLengthSize":null,"IsInterlaced":false,"IsAVC":false,"ChannelLayout":"5.1","BitRate":768000,"BitDepth":null,"RefFrames":null,"PacketLength":null,"Channels":6,"SampleRate":48000,"IsDefault":true,"IsForced":true,"IsHearingImpaired":false,"Height":null,"Width":null,"AverageFrameRate":null,"RealFrameRate":null,"ReferenceFrameRate":null,"Profile":"DTS","Type":0,"AspectRatio":null,"Index":0,"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":null,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":null,"LocalizedDefault":"Par d\u00E9faut","LocalizedForced":null,"LocalizedExternal":"Externe","LocalizedHearingImpaired":null,"DisplayTitle":"English - DTS - 5.1","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":1,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Path":null,"PixelFormat":null,"Level":0,"IsAnamorphic":null},{"Codec":"h264","CodecTag":null,"Language":null,"ColorRange":null,"ColorSpace":"bt709","ColorTransfer":"bt709","ColorPrimaries":"bt709","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,"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":17697839,"BitDepth":8,"RefFrames":1,"PacketLength":null,"Channels":null,"SampleRate":null,"IsDefault":true,"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":2,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Path":null,"PixelFormat":"yuv420p","Level":41,"IsAnamorphic":false},{"Codec":"PGSSUB","CodecTag":null,"Language":"fre","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,"VideoRange":0,"VideoRangeType":0,"VideoDoViTitle":null,"AudioSpatialFormat":0,"LocalizedUndefined":"Non d\u00E9fini","LocalizedDefault":"Par d\u00E9faut","LocalizedForced":"Forc\u00E9","LocalizedExternal":"Externe","LocalizedHearingImpaired":"Malentendants","DisplayTitle":"Fre - 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":1080,"Width":1920,"AverageFrameRate":null,"RealFrameRate":null,"ReferenceFrameRate":null,"Profile":null,"Type":2,"AspectRatio":null,"Index":3,"Score":null,"IsExternal":false,"DeliveryMethod":null,"DeliveryUrl":null,"IsExternalUrl":null,"IsTextSubtitleStream":false,"SupportsExternalStream":true,"Path":null,"PixelFormat":null,"Level":0,"IsAnamorphic":null}],"MediaAttachments":[],"Formats":[],"Bitrate":20001839,"FallbackMaxStreamingBitrate":null,"Timestamp":null,"RequiredHttpHeaders":{},"TranscodingUrl":null,"TranscodingSubProtocol":0,"TranscodingContainer":null,"AnalyzeDurationMs":null,"DefaultAudioStreamIndex":null,"DefaultSubtitleStreamIndex":null,"HasSegments":false}
/usr/lib/jellyfin-ffmpeg/ffmpeg -analyzeduration 200M -probesize 1G -fflags +genpts -i file:"/media/Films 3D/Dragon 2 3D.mkv" -map_metadata -1 -map_chapters -1 -threads 0 -map 0:2 -map 0:0 -map -0:s -codec:v:0 copy -bsf:v h264_mp4toannexb -start_at_zero -codec:a:0 aac -ac 2 -ab 256000 -af "volume=2" -copyts -avoid_negative_ts disabled -max_muxing_queue_size 2048 -f hls -max_delay 5000000 -hls_time 6 -hls_segment_type mpegts -start_number 0 -hls_segment_filename "/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc2%d.ts" -hls_playlist_type vod -hls_list_size 0 -y "/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc2.m3u8"
ffmpeg version 7.0.2-Jellyfin Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 14.2.1 (GCC) 20240910
configuration: --prefix=/usr/lib/jellyfin-ffmpeg --target-os=linux --extra-version=Jellyfin --disable-doc --disable-ffplay --disable-ptx-compression --disable-shared --disable-libxcb --disable-sdl2 --disable-xlib --enable-gpl --enable-version3 --enable-static --enable-gmp --enable-gnutls --enable-chromaprint --enable-libfontconfig --enable-libass --enable-libbluray --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopus --enable-libopenmpt --enable-libtheora --enable-libvorbis --enable-libdav1d --enable-libsvtav1 --enable-libwebp --enable-libvpx --enable-libx264 --enable-libx265 --enable-libzvbi --enable-libzimg --enable-libshaderc --enable-libplacebo --enable-vulkan --enable-opencl --enable-vaapi --enable-amf --enable-libvpl --enable-ffnvcodec --enable-cuda --enable-cuda-llvm --enable-cuvid --enable-nvdec --enable-nvenc
libavutil 59. 8.100 / 59. 8.100
libavcodec 61. 3.100 / 61. 3.100
libavformat 61. 1.100 / 61. 1.100
libavdevice 61. 1.100 / 61. 1.100
libavfilter 10. 1.100 / 10. 1.100
libswscale 8. 1.100 / 8. 1.100
libswresample 5. 1.100 / 5. 1.100
libpostproc 58. 1.100 / 58. 1.100
Input #0, matroska,webm, from 'file:/media/Films 3D/Dragon 2 3D.mkv':
Metadata:
title : Dragon2
encoder : libebml v1.3.0 + libmatroska v1.4.1
creation_time : 2014-10-29T10:30:53.000000Z
Duration: 01:41:55.12, start: 0.000000, bitrate: 17697 kb/s
Chapters:
Chapter #0:0: start 0.000000, end 207.999000
Metadata:
title : (01)00:00:00:000
Chapter #0:1: start 207.999000, end 320.695000
Metadata:
title : (02)00:03:27:999
Chapter #0:2: start 320.695000, end 466.007000
Metadata:
title : (03)00:05:20:695
Chapter #0:3: start 466.007000, end 616.032000
Metadata:
title : (04)00:07:46:007
Chapter #0:4: start 616.032000, end 796.337000
Metadata:
title : (05)00:10:16:032
Chapter #0:5: start 796.337000, end 1019.059000
Metadata:
title : (06)00:13:16:337
Chapter #0:6: start 1019.059000, end 1201.700000
Metadata:
title : (07)00:16:59:059
Chapter #0:7: start 1201.700000, end 1423.255000
Metadata:
title : (08)00:20:01:700
Chapter #0:8: start 1423.255000, end 1634.466000
Metadata:
title : (09)00:23:43:255
Chapter #0:9: start 1634.466000, end 1761.468000
Metadata:
title : (10)00:27:14:466
Chapter #0:10: start 1761.468000, end 2021.936000
Metadata:
title : (11)00:29:21:468
Chapter #0:11: start 2021.936000, end 2225.473000
Metadata:
title : (12)00:33:41:936
Chapter #0:12: start 2225.473000, end 2346.969000
Metadata:
title : (13)00:37:05:473
Chapter #0:13: start 2346.969000, end 2459.165000
Metadata:
title : (14)00:39:06:969
Chapter #0:14: start 2459.165000, end 2703.992000
Metadata:
title : (15)00:40:59:165
Chapter #0:15: start 2703.992000, end 2836.625000
Metadata:
title : (16)00:45:03:992
Chapter #0:16: start 2836.625000, end 3111.525000
Metadata:
title : (17)00:47:16:625
Chapter #0:17: start 3111.525000, end 3275.730000
Metadata:
title : (18)00:51:51:525
Chapter #0:18: start 3275.730000, end 3375.997000
Metadata:
title : (19)00:54:35:730
Chapter #0:19: start 3375.997000, end 3633.171000
Metadata:
title : (20)00:56:15:997
Chapter #0:20: start 3633.171000, end 3868.781000
Metadata:
title : (21)01:00:33:171
Chapter #0:21: start 3868.781000, end 3994.949000
Metadata:
title : (22)01:04:28:781
Chapter #0:22: start 3994.949000, end 4184.138000
Metadata:
title : (23)01:06:34:949
Chapter #0:23: start 4184.138000, end 4441.854000
Metadata:
title : (24)01:09:44:138
Chapter #0:24: start 4441.854000, end 4715.127000
Metadata:
title : (25)01:14:01:854
Chapter #0:25: start 4715.127000, end 4867.153000
Metadata:
title : (26)01:18:35:127
Chapter #0:26: start 4867.153000, end 4975.053000
Metadata:
title : (27)01:21:07:153
Chapter #0:27: start 4975.053000, end 5070.065000
Metadata:
title : (28)01:22:55:053
Chapter #0:28: start 5070.065000, end 5284.654000
Metadata:
title : (29)01:24:30:065
Chapter #0:29: start 5284.654000, end 5463.499000
Metadata:
title : (30)01:28:04:654
Chapter #0:30: start 5463.499000, end 5541.994000
Metadata:
title : (31)01:31:03:499
Chapter #0:31: start 5541.994000, end 6114.858000
Metadata:
title : (32)01:32:21:994
Chapter #0:32: start 6114.858000, end 6115.116000
Metadata:
title : (33)01:41:54:858
Stream #0:0(fre): Audio: dts (dca) (DTS), 48000 Hz, 5.1(side), fltp, 768 kb/s (default) (forced)
Stream #0:1(eng): Audio: dts (dca) (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s
Stream #0:2: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn (default)
Stream #0:3(fre): Subtitle: hdmv_pgs_subtitle (pgssub), 1920x1080
Stream mapping:
Stream #0:2 -> #0:0 (copy)
Stream #0:0 -> #0:1 (dts (dca) -> aac (native))
Press [q] to stop, [?] for help
Output #0, hls, to '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc2.m3u8':
Metadata:
encoder : Lavf61.1.100
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 90k tbn (default)
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 256 kb/s (default) (forced)
Metadata:
encoder : Lavc61.3.100 aac
size=N/A time=00:00:00.00 bitrate=N/A speed= 0x
size=N/A time=00:00:00.49 bitrate=N/A speed=0.491x
size=N/A time=00:00:02.24 bitrate=N/A speed=1.49x
size=N/A time=00:00:04.43 bitrate=N/A speed=2.22x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc20.ts' for writing
size=N/A time=00:00:06.25 bitrate=N/A speed= 2.5x
size=N/A time=00:00:07.87 bitrate=N/A speed=2.62x
size=N/A time=00:00:10.19 bitrate=N/A speed=2.91x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc21.ts' for writing
size=N/A time=00:00:12.28 bitrate=N/A speed=3.07x
size=N/A time=00:00:13.48 bitrate=N/A speed=2.99x
size=N/A time=00:00:15.65 bitrate=N/A speed=3.13x
size=N/A time=00:00:18.07 bitrate=N/A speed=3.28x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc22.ts' for writing
size=N/A time=00:00:19.17 bitrate=N/A speed= 3.2x
size=N/A time=00:00:21.50 bitrate=N/A speed=3.31x
size=N/A time=00:00:23.89 bitrate=N/A speed=3.41x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc23.ts' for writing
size=N/A time=00:00:24.34 bitrate=N/A speed=3.24x
size=N/A time=00:00:24.85 bitrate=N/A speed=3.11x
size=N/A time=00:00:25.34 bitrate=N/A speed=2.98x
size=N/A time=00:00:27.00 bitrate=N/A speed= 3x
size=N/A time=00:00:29.26 bitrate=N/A speed=3.08x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc24.ts' for writing
size=N/A time=00:00:30.86 bitrate=N/A speed=3.09x
size=N/A time=00:00:32.53 bitrate=N/A speed= 3.1x
size=N/A time=00:00:35.05 bitrate=N/A speed=3.19x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc25.ts' for writing
size=N/A time=00:00:36.84 bitrate=N/A speed= 3.2x
size=N/A time=00:00:38.86 bitrate=N/A speed=3.24x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc26.ts' for writing
size=N/A time=00:00:41.66 bitrate=N/A speed=3.33x
size=N/A time=00:00:43.07 bitrate=N/A speed=3.31x
size=N/A time=00:00:45.61 bitrate=N/A speed=3.38x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc27.ts' for writing
size=N/A time=00:00:47.68 bitrate=N/A speed= 3.4x
size=N/A time=00:00:49.49 bitrate=N/A speed=3.41x
size=N/A time=00:00:52.26 bitrate=N/A speed=3.48x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc28.ts' for writing
size=N/A time=00:00:54.05 bitrate=N/A speed=3.49x
size=N/A time=00:00:56.36 bitrate=N/A speed=3.52x
size=N/A time=00:00:58.96 bitrate=N/A speed=3.57x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc29.ts' for writing
size=N/A time=00:01:00.58 bitrate=N/A speed=3.56x
size=N/A time=00:01:02.12 bitrate=N/A speed=3.55x
size=N/A time=00:01:04.42 bitrate=N/A speed=3.58x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc210.ts' for writing
size=N/A time=00:01:06.49 bitrate=N/A speed=3.59x
size=N/A time=00:01:07.49 bitrate=N/A speed=3.55x
size=N/A time=00:01:09.54 bitrate=N/A speed=3.56x
size=N/A time=00:01:12.17 bitrate=N/A speed=3.61x
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc211.ts' for writing
[q] command received. Exiting.
[hls @ 0x556ab6eada00] Opening '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc212.ts' for writing
[out#0/hls @ 0x556ab6aafa00] video:146895KiB audio:2315KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
size=N/A time=00:01:14.02 bitrate=N/A speed= 3.6x
[aac @ 0x556ab3db4380] Qavg: 6955.901There is indeed somthing strange here :
Code:
Stream #0:0(fre): Audio: dts (dca) (DTS), 48000 Hz, 5.1(side), fltp, 768 kb/s (default) (forced)
Stream #0:1(eng): Audio: dts (dca) (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s
Stream #0:2: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn (default)
Stream #0:3(fre): Subtitle: hdmv_pgs_subtitle (pgssub), 1920x1080
Stream mapping:
Stream #0:2 -> #0:0 (copy)
Stream #0:0 -> #0:1 (dts (dca) -> aac (native))
Press [q] to stop, [?] for help
Output #0, hls, to '/config/cache/transcodes/db8577dc4ef0a032b876b14fcf87acc2.m3u8':
Metadata:
encoder : Lavf61.1.100
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 90k tbn (default)
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 256 kb/s (default) (forced)Why does Jellyfin transcode the audio track to aac?
Is this the normal behavior of Jellyfin? My Unraid server has very limited hardware and is only used as a storage server for MKV files. It's not designed for transcoding (my Zidoo media player handles the video decoding, and my amplifier handles the audio).
However, when I stream, Jellyfin shows "Direct Play - The source file is fully compatible with this client, and the session is receiving the file without modifications."
I don't really understand what's going on here...