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Emby server on imac streaming to Chromecast 2.0 : no sound with mkv AC3

Raph Gill

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Hi guys,


I am new to this community and plan to by a lifetime subscription since the UI is much better than plex and the server is more responsive.

However I encounter the same problem I have on Plex :


I use a imac running on high sierra to stream my movies to Chromecast 2.0. But... I have no sound with mkv AC3, ie 90% of my files... I can only get a continuons awful spitting noise. How can I make my sound to work?


Looking forward to read from you mates! :)






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Hi Luke,

Thanks for this quick answer.

Here is an example of the sound I get : click
Here is the log.

2019-03-25 16:36:49.531
Application version:,vp8&AudioCodec=ac3,aac,mp3,opus,flac,vorbis&VideoBitrate=30000000&AudioBitrate=320000&StartTimeTicks=32752594330&PlaySessionId=a4b60779820649bf9162d2dfcc3282f7&api_key=cf9b28b8e2f7403aa89771440dc4392a&AudioStreamIndex=1&SubtitleMethod=Encode&TranscodingMaxAudioChannels=6&CopyTimestamps=true&h264-profile=high,main,baseline,constrainedbaseline&h264-level=42&aac-audiochannels=2&TranscodeReasons=AudioChannelsNotSupported

{"Protocol":"File","Id":"5457970a02dceb737ef8706338a36e88","Path":"/Volumes/DISQUE2T/Videos/Movies/HD/Allegiant.2016.mkv","Type":"Default","Container":"mkv","Size":2358077793,"Name":"Allegiant.2016","IsRemote":false,"RunTimeTicks":72332263424,"ReadAtNativeFramerate":false,"DiscardCorruptPts":false,"FillWallClockDts":false,"IgnoreDts":false,"IgnoreIndex":false,"SupportsTranscoding":true,"SupportsDirectStream":true,"SupportsDirectPlay":true,"IsInfiniteStream":false,"RequiresOpening":false,"RequiresClosing":false,"RequiresLooping":false,"SupportsProbing":true,"MediaStreams":[{"Codec":"h264","TimeBase":"1/1000","CodecTimeBase":"1001/48000","VideoRange":"SDR","DisplayTitle":"1080p H264","NalLengthSize":"4","IsInterlaced":false,"IsAVC":true,"BitRate":2608051,"BitDepth":8,"RefFrames":1,"IsDefault":true,"IsForced":false,"Height":800,"Width":1920,"AverageFrameRate":23.9760246,"RealFrameRate":23.9760246,"Profile":"High","Type":"Video","AspectRatio":"2.40:1","Index":0,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"PixelFormat":"yuv420p","Level":40,"IsAnamorphic":false},{"Codec":"aac","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"1/48000","DisplayTitle":"Eng AAC 5.1 Default","IsInterlaced":false,"ChannelLayout":"5.1","BitRate":320000,"Channels":6,"SampleRate":48000,"IsDefault":true,"IsForced":false,"Profile":"HE-AAC","Type":"Audio","Index":1,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0},{"Codec":"srt","DisplayTitle":"Und","IsInterlaced":false,"IsDefault":false,"IsForced":false,"Type":"Subtitle","Index":2,"IsExternal":true,"IsTextSubtitleStream":true,"SupportsExternalStream":true,"Path":"/Volumes/DISQUE2T/Videos/Movies/HD/Allegiant.2016.srt"}],"Formats":[],"Bitrate":2608051,"RequiredHttpHeaders":{}}

User policy for imac: EnablePlaybackRemuxing: True EnableVideoPlaybackTranscoding: True EnableAudioPlaybackTranscoding: True

/private/var/folders/mb/v_b424xx7292xyhfqccsl9300000gn/T/AppTranslocation/0051726D-E168-425D-9A99-135B277C4F6B/d/EmbyServer.app/Contents/MacOS/ffmpeg -ss 00:54:35.259 -f matroska -i file:"/Volumes/DISQUE2T/Videos/Movies/HD/Allegiant.2016.mkv" -map 0:0 -map 0:1 -map -0:s -c:v:0 copy -copyts -avoid_negative_ts disabled -start_at_zero -vsync -1 -map_metadata -1 -map_chapters -1 -threads 0 -codec:a:0 ac3 -metadata:s:a:0 language=eng -disposition:a:0 default -ac:a:0 6 -ab:a:0 320000 -ar:a:0 48000 -y "/Users/imac/.config/emby-server/transcoding-temp/9d22871b5fb4c07f0b2875c58c88f197.mkv"

ffmpeg version 4.0.2-emby_2018_10_29 Copyright © 2000-2018 the FFmpeg developers
built with Apple LLVM version 10.0.0 (clang-1000.11.45.2)
configuration: --enable-static --disable-shared --disable-doc --disable-ffplay --enable-gmp --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-fontconfig --enable-gnutls --enable-libass --enable-libbluray --enable-libfreetype --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libaom --enable-version3 --enable-libzvbi
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
Input #0, matroska,webm, from 'file:/Volumes/DISQUE2T/Videos/Movies/HD/Allegiant.2016.mkv':
encoder : libebml v1.3.1 + libmatroska v1.4.2
creation_time : 2016-06-30T00:17:25.000000Z
Duration: 02:00:33.23, start: 0.000000, bitrate: 2608 kb/s
Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x800 [sAR 1:1 DAR 12:5], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
BPS : 2418154
BPS-eng : 2418154
DURATION : 02:00:33.226000000
DURATION-eng : 02:00:33.226000000
NUMBER_OF_FRAMES-eng: 173424
NUMBER_OF_BYTES : 2186381981
NUMBER_OF_BYTES-eng: 2186381981
_STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
_STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
_STATISTICS_WRITING_DATE_UTC: 2016-06-30 00:17:25
_STATISTICS_WRITING_DATE_UTC-eng: 2016-06-30 00:17:25
Stream #0:1(eng): Audio: aac (HE-AAC), 48000 Hz, 5.1, fltp (default)
BPS : 188030
BPS-eng : 188030
DURATION : 02:00:33.195000000
DURATION-eng : 02:00:33.195000000
NUMBER_OF_FRAMES-eng: 169528
NUMBER_OF_BYTES : 170007443
NUMBER_OF_BYTES-eng: 170007443
_STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
_STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
_STATISTICS_WRITING_DATE_UTC: 2016-06-30 00:17:25
_STATISTICS_WRITING_DATE_UTC-eng: 2016-06-30 00:17:25
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (aac (native) -> ac3 (native))
Press [q] to stop, [?] for help
Output #0, matroska, to '/Users/imac/.config/emby-server/transcoding-temp/9d22871b5fb4c07f0b2875c58c88f197.mkv':
encoder : Lavf58.12.100
Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(progressive), 1920x800 [sAR 1:1 DAR 12:5], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1, fltp, 320 kb/s (default)
encoder : Lavc58.18.100 ac3
frame= 626 fps=0.0 q=-1.0 size= 11816kB time=00:54:59.12 bitrate= 29.3kbits/s speed=6.59e+03x
frame= 1326 fps=1325 q=-1.0 size= 23443kB time=00:55:28.43 bitrate= 57.7kbits/s speed=3.33e+03x
frame= 2002 fps=1333 q=-1.0 size= 35052kB time=00:55:56.34 bitrate= 85.6kbits/s speed=2.24e+03x
frame= 2713 fps=1355 q=-1.0 size= 45184kB time=00:56:26.19 bitrate= 109.3kbits/s speed=1.69e+03x
frame= 3479 fps=1390 q=-1.0 size= 52932kB time=00:56:58.03 bitrate= 126.9kbits/s speed=1.37e+03x
frame= 4249 fps=1415 q=-1.0 size= 60015kB time=00:57:30.00 bitrate= 142.5kbits/s speed=1.15e+03x
frame= 4993 fps=1425 q=-1.0 size= 66923kB time=00:58:01.23 bitrate= 157.5kbits/s speed= 994x
frame= 5726 fps=1430 q=-1.0 size= 74758kB time=00:58:31.82 bitrate= 174.4kbits/s speed= 877x
frame= 6485 fps=1440 q=-1.0 size= 80022kB time=00:59:03.57 bitrate= 185.0kbits/s speed= 787x
frame= 7047 fps=1408 q=-1.0 size= 96308kB time=00:59:26.90 bitrate= 221.2kbits/s speed= 713x
frame= 7782 fps=1414 q=-1.0 size= 104842kB time=00:59:57.46 bitrate= 238.7kbits/s speed= 653x
frame= 8347 fps=1390 q=-1.0 size= 121395kB time=01:00:21.04 bitrate= 274.6kbits/s speed= 603x
frame= 8983 fps=1381 q=-1.0 size= 133225kB time=01:00:47.76 bitrate= 299.2kbits/s speed= 561x
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frame=19829 fps=1267 q=-1.0 size= 330764kB time=01:08:20.14 bitrate= 660.9kbits/s speed= 262x
frame=20591 fps=1275 q=-1.0 size= 337684kB time=01:08:51.86 bitrate= 669.5kbits/s speed= 256x
frame=21366 fps=1283 q=-1.0 size= 343908kB time=01:09:24.02 bitrate= 676.6kbits/s speed= 250x
frame=22127 fps=1290 q=-1.0 size= 351227kB time=01:09:55.92 bitrate= 685.7kbits/s speed= 245x
frame=22852 fps=1295 q=-1.0 size= 360784kB time=01:10:26.10 bitrate= 699.4kbits/s speed= 239x
frame=23591 fps=1300 q=-1.0 size= 370071kB time=01:10:57.04 bitrate= 712.1kbits/s speed= 235x
frame=24349 fps=1305 q=-1.0 size= 378322kB time=01:11:28.56 bitrate= 722.7kbits/s speed= 230x
frame=25111 fps=1311 q=-1.0 size= 384670kB time=01:12:00.40 bitrate= 729.4kbits/s speed= 226x
frame=25788 fps=1312 q=-1.0 size= 398127kB time=01:12:28.56 bitrate= 750.0kbits/s speed= 221x
frame=26433 fps=1312 q=-1.0 size= 412785kB time=01:12:55.60 bitrate= 772.8kbits/s speed= 217x
frame=27117 fps=1313 q=-1.0 size= 424183kB time=01:13:23.92 bitrate= 789.0kbits/s speed= 213x
frame=27796 fps=1314 q=-1.0 size= 436541kB time=01:13:52.21 bitrate= 806.9kbits/s speed= 210x
frame=28515 fps=1317 q=-1.0 size= 443061kB time=01:14:22.26 bitrate= 813.4kbits/s speed= 206x
frame=29254 fps=1320 q=-1.0 size= 447796kB time=01:14:53.23 bitrate= 816.4kbits/s speed= 203x
frame=29960 fps=1322 q=-1.0 size= 452541kB time=01:15:22.67 bitrate= 819.7kbits/s speed= 200x
frame=30710 fps=1326 q=-1.0 size= 459466kB time=01:15:54.00 bitrate= 826.5kbits/s speed= 197x
frame=31477 fps=1331 q=-1.0 size= 466464kB time=01:16:26.00 bitrate= 833.2kbits/s speed= 194x
frame=32161 fps=1331 q=-1.0 size= 477850kB time=01:16:54.19 bitrate= 848.4kbits/s speed= 191x
frame=32856 fps=1332 q=-1.0 size= 486876kB time=01:17:23.25 bitrate= 859.0kbits/s speed= 188x
frame=33543 fps=1333 q=-1.0 size= 496011kB time=01:17:52.18 bitrate= 869.7kbits/s speed= 186x
frame=34220 fps=1334 q=-1.0 size= 505178kB time=01:18:20.21 bitrate= 880.5kbits/s speed= 183x
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frame=38899 fps=1310 q=-1.0 size= 562266kB time=01:21:35.41 bitrate= 940.9kbits/s speed= 165x
frame=39556 fps=1310 q=-1.0 size= 575899kB time=01:22:02.64 bitrate= 958.4kbits/s speed= 163x
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frame=46700 fps=1327 q=-1.0 size= 656248kB time=01:27:00.82 bitrate=1029.7kbits/s speed= 148x
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frame=51052 fps=1336 q=-1.0 size= 711161kB time=01:30:02.26 bitrate=1078.4kbits/s speed= 141x
frame=51675 fps=1335 q=-1.0 size= 726146kB time=01:30:28.40 bitrate=1095.8kbits/s speed= 140x
frame=52199 fps=1331 q=-1.0 size= 736761kB time=01:30:50.19 bitrate=1107.4kbits/s speed= 139x
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frame=54183 fps=1331 q=-1.0 size= 782379kB time=01:32:12.94 bitrate=1158.4kbits/s speed= 136x
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frame=57688 fps=1335 q=-1.0 size= 838931kB time=01:34:39.06 bitrate=1210.2kbits/s speed= 131x
frame=58426 fps=1337 q=-1.0 size= 846465kB time=01:35:09.78 bitrate=1214.4kbits/s speed= 131x
frame=59186 fps=1339 q=-1.0 size= 854345kB time=01:35:41.58 bitrate=1219.0kbits/s speed= 130x
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frame=62193 fps=1346 q=-1.0 size= 887286kB time=01:37:46.96 bitrate=1238.9kbits/s speed= 127x
frame=62922 fps=1347 q=-1.0 size= 897622kB time=01:38:17.49 bitrate=1246.9kbits/s speed= 126x
frame=63690 fps=1349 q=-1.0 size= 905498kB time=01:38:49.43 bitrate=1251.0kbits/s speed= 126x
frame=64496 fps=1352 q=-1.0 size= 911628kB time=01:39:23.02 bitrate=1252.4kbits/s speed= 125x

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What's happening is Chromecast is detecting that your equipment supports AC3, when it actually doesn't. So that's why we're outputting AC3 and then you end up with no sound.


Do you really have to use the hdmi splitter? If you can simplify your connections, I'm sure this problem will go away.

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  • 4 weeks later...

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