Can only hear speech through one speaker when using web client

[fengshaun 0]

Hi,

 

When I try watching a tv show from my collection on emby's web client, I only get speech audio from the right speaker, but the laugh tracks and background music play through both speakers. The audio is also noticeably softer (lower volume). When I try watching the same show through emby's windows client (emby theatre), the audio sounds just fine. This makes me think that transcoding is doing something to the audio which it shouldn't, but I can't figure out how to resolve this issue.

 

Is there a way to fix the audio issues perhaps by changing the transcoding options somewhere? I couldn't find any way to change transcoding parameters neither would I know how they should be changed to fix this audio issue.

 

Thanks.

{"Protocol":"File","Id":"672bad259f19493ff72c57c421292508","Path":"/mpool/tvshows/Show/Show S01E02.mkv","Type":"Default","Container":"mkv","Name":"1080P/H264/AC3","RunTimeTicks":12905920000,"ReadAtNativeFramerate":false,"SupportsTranscoding":true,"SupportsDirectStream":true,"SupportsDirectPlay":true,"RequiresOpening":false,"RequiresClosing":false,"VideoType":"VideoFile","MediaStreams":[{"Codec":"h264","Language":"eng","IsInterlaced":false,"BitRate":7937968,"BitDepth":8,"RefFrames":4,"IsDefault":true,"IsForced":false,"Height":1066,"Width":1920,"AverageFrameRate":23.97602,"RealFrameRate":23.97602,"Profile":"High","Type":"Video","AspectRatio":"16:9","Index":0,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"PixelFormat":"yuv420p","Level":41,"IsAnamorphic":false,"IsCabac":false},{"Codec":"ac3","IsInterlaced":false,"ChannelLayout":"5.1","BitRate":384000,"Channels":6,"SampleRate":48000,"IsDefault":true,"IsForced":false,"Type":"Audio","Index":1,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0}],"PlayableStreamFileNames":[],"Formats":[],"Bitrate":7937968,"RequiredHttpHeaders":{}}
/usr/local/bin/ffmpeg -ss 00:03:51.000 -i file:"/mpool/tvshows/Show/Show S01E02.mkv" -map_metadata -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 libx264 -pix_fmt yuv420p -preset superfast -crf 23 -b:v 7937968 -maxrate 7937968 -bufsize 15875936 -vsync vfr -profile:v high -level 41 -force_key_frames "expr:gte(t,n_forced*3)" -vf "scale=trunc(oh*a/2)*2:min(ih\,1080)" -flags -global_header -sc_threshold 0 -output_ts_offset 00:03:51.000 -codec:a:0 aac -strict experimental -ac 6 -ab 320000 -af "adelay=1,aresample=async=1" -hls_time 3 -start_number 77 -hls_list_size 0 -y "/var/db/emby-server/transcoding-temp/c893d6372de4d5435a4b48f1993077af.m3u8"

ffmpeg version 2.8.3 Copyright (c) 2000-2015 the FFmpeg developers

  built with FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512

  configuration: --prefix=/usr/local --mandir=/usr/local/man --datadir=/usr/local/share/ffmpeg --pkgconfigdir=/usr/local/libdata/pkgconfig --enable-shared --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --enable-pthreads --disable-libstagefright-h264 --disable-libutvideo --disable-libsoxr --cc=cc --extra-cflags='-msse -I/usr/local/include/vorbis -I/usr/local/include' --extra-ldflags='-L/usr/local/lib ' --extra-libs=-lpthread --disable-libaacplus --disable-indev=alsa --disable-outdev=alsa --disable-libopencore-amrnb --disable-libopencore-amrwb --enable-libass --disable-libbs2b --disable-libcaca --disable-libcdio --disable-libcelt --disable-libdc1394 --disable-debug --disable-htmlpages --enable-libfaac --disable-libfdk-aac --enable-ffserver --disable-libflite --disable-fontconfig --disable-libfreetype --disable-frei0r --disable-libfribidi --disable-libgme --disable-libgsm --enable-iconv --disable-libilbc --disable-indev=jack --disable-ladspa --enable-libmp3lame --disable-libbluray --disable-libv4l2 --disable-indev=v4l2 --disable-outdev=v4l2 --enable-mmx --disable-libmodplug --disable-openal --disable-indev=openal --disable-opencl --disable-libopencv --disable-opengl --enable-libopenh264 --enable-libopenjpeg --disable-libopus --disable-libpulse --disable-indev=pulse --disable-outdev=pulse --disable-libquvi --enable-runtime-cpudetect --enable-librtmp --enable-libschroedinger --disable-ffplay --disable-outdev=sdl --disable-libsmbclient --disable-libsnappy --disable-libspeex --enable-sse --disable-libssh --enable-libtheora --disable-libtwolame --disable-vaapi --disable-vdpau --disable-libvidstab --enable-libvorbis --disable-libvo-aacenc --disable-libvo-amrwbenc --enable-libvpx --disable-libwavpack --disable-libwebp --disable-x11grab --enable-libx264 --enable-libx265 --disable-libxcb --enable-libxvid --disable-outdev=xv --disable-libzmq --disable-libzvbi --disable-gnutls --enable-openssl --enable-version3 --enable-nonfree

  libavutil      54. 31.100 / 54. 31.100

  libavcodec     56. 60.100 / 56. 60.100

  libavformat    56. 40.101 / 56. 40.101

  libavdevice    56.  4.100 / 56.  4.100

  libavfilter     5. 40.101 /  5. 40.101

  libavresample   2.  1.  0 /  2.  1.  0

  libswscale      3.  1.101 /  3.  1.101

  libswresample   1.  2.101 /  1.  2.101

  libpostproc    53.  3.100 / 53.  3.100

Input #0, matroska,webm, from 'file:/mpool/tvshows/Show/Show S01E02.mkv':

  Metadata:

    encoder         : libebml v1.3.1 + libmatroska v1.4.2

    creation_time   : 2015-12-11 05:55:02

  Duration: 00:21:30.59, start: 0.000000, bitrate: 7937 kb/s

    Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1066, SAR 1:1 DAR 960:533, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)

    Metadata:

      BPS             : 7555803

      BPS-eng         : 7555803

      DURATION        : 00:21:29.956000000

      DURATION-eng    : 00:21:29.956000000

      NUMBER_OF_FRAMES: 30928

      NUMBER_OF_FRAMES-eng: 30928

      NUMBER_OF_BYTES : 1218331678

      NUMBER_OF_BYTES-eng: 1218331678

      _STATISTICS_WRITING_APP: mkvmerge v8.4.0 ('A better way to fly') 64bit

      _STATISTICS_WRITING_APP-eng: mkvmerge v8.4.0 ('A better way to fly') 64bit

      _STATISTICS_WRITING_DATE_UTC: 2015-12-11 05:55:02

      _STATISTICS_WRITING_DATE_UTC-eng: 2015-12-11 05:55:02

      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)

    Metadata:

      BPS             : 384000

      BPS-eng         : 384000

      DURATION        : 00:21:30.592000000

      DURATION-eng    : 00:21:30.592000000

      NUMBER_OF_FRAMES: 40331

      NUMBER_OF_FRAMES-eng: 40331

      NUMBER_OF_BYTES : 61948416

      NUMBER_OF_BYTES-eng: 61948416

      _STATISTICS_WRITING_APP: mkvmerge v8.4.0 ('A better way to fly') 64bit

      _STATISTICS_WRITING_APP-eng: mkvmerge v8.4.0 ('A better way to fly') 64bit

      _STATISTICS_WRITING_DATE_UTC: 2015-12-11 05:55:02

      _STATISTICS_WRITING_DATE_UTC-eng: 2015-12-11 05:55:02

      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

[libx264 @ 0x808c9ff00] using SAR=1/1

[libx264 @ 0x808c9ff00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2

[libx264 @ 0x808c9ff00] profile High, level 4.1

Output #0, hls, to '/var/db/emby-server/transcoding-temp/c893d6372de4d5435a4b48f1993077af.m3u8':

  Metadata:

    encoder         : Lavf56.40.101

    Stream #0:0: Video: h264 (libx264), yuv420p, 1920x1066 [SAR 1:1 DAR 960:533], q=-1--1, 7937 kb/s, 23.98 fps, 90k tbn, 23.98 tbc (default)

    Metadata:

      encoder         : Lavc56.60.100 libx264

    Stream #0:1: Audio: aac, 48000 Hz, 5.1, fltp, 320 kb/s (default)

    Metadata:

      encoder         : Lavc56.60.100 aac

Stream mapping:

  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))

  Stream #0:1 -> #0:1 (ac3 (native) -> aac (native))

Press [q] to stop, [?] for help

frame=   40 fps=0.0 q=24.0 size=N/A time=00:00:02.15 bitrate=N/A    

frame=  108 fps=108 q=23.0 size=N/A time=00:00:05.22 bitrate=N/A    

frame=  127 fps= 85 q=21.0 size=N/A time=00:00:05.67 bitrate=N/A    

frame=  187 fps= 93 q=22.0 size=N/A time=00:00:08.29 bitrate=N/A    

frame=  259 fps=103 q=23.0 size=N/A time=00:00:11.24 bitrate=N/A    

frame=  319 fps=106 q=24.0 size=N/A time=00:00:13.86 bitrate=N/A    

frame=  387 fps=110 q=23.0 size=N/A time=00:00:16.78 bitrate=N/A    

frame=  460 fps=115 q=23.0 size=N/A time=00:00:19.62 bitrate=N/A    

...

video:102299kB audio:7653kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[libx264 @ 0x808c9ff00] frame I:66    Avg QP:18.11  size:142607

[libx264 @ 0x808c9ff00] frame P:1388  Avg QP:19.48  size: 41636

[libx264 @ 0x808c9ff00] frame B:3262  Avg QP:20.85  size: 11512

[libx264 @ 0x808c9ff00] consecutive B-frames:  5.8%  4.3%  5.2% 84.7%

[libx264 @ 0x808c9ff00] mb I  I16..4: 10.3% 43.1% 46.6%

[libx264 @ 0x808c9ff00] mb P  I16..4:  6.0%  8.2%  2.1%  P16..4: 66.2%  0.0%  0.0%  0.0%  0.0%    skip:17.6%

[libx264 @ 0x808c9ff00] mb B  I16..4:  0.9%  0.6%  0.1%  B16..8: 26.3%  0.0%  0.0%  direct:15.7%  skip:56.5%  L0:38.5% L1:49.5% BI:11.9%

[libx264 @ 0x808c9ff00] 8x8 transform intra:46.9% inter:51.3%

[libx264 @ 0x808c9ff00] coded y,uvDC,uvAC intra: 56.2% 73.9% 34.7% inter: 10.9% 24.9% 0.9%

[libx264 @ 0x808c9ff00] i16 v,h,dc,p: 47% 23% 20%  9%

[libx264 @ 0x808c9ff00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 20% 22%  6%  6%  6%  6%  6%  8%

[libx264 @ 0x808c9ff00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 26% 10%  7%  6%  7%  7%  6%  8%

[libx264 @ 0x808c9ff00] i8c dc,h,v,p: 34% 26% 27% 12%

[libx264 @ 0x808c9ff00] Weighted P-Frames: Y:0.7% UV:0.5%

[libx264 @ 0x808c9ff00] kb/s:4260.56

Edited December 17, 2015 by fengshaun

[Luke 36997]

i can't reproduce this problem but you could try running the ffmpeg command line outside of emby and testing the segments manually. you could try various changes such as audio channels, switching aac to mp3, etc.

[fengshaun 0]

Alright, as long as it's just me, then I can probably figure out what wrong. Would you please post your ffmpeg configuration and command line in one of your transcoding logs so I have something to compare to get started? Thanks!

[Luke 36997]

the command line is in the log above:

/usr/local/bin/ffmpeg -ss 00:03:51.000 -i file:"/mpool/tvshows/Show/Show S01E02.mkv" -map_metadata -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 libx264 -pix_fmt yuv420p -preset superfast -crf 23 -b:v 7937968 -maxrate 7937968 -bufsize 15875936 -vsync vfr -profile:v high -level 41 -force_key_frames "expr:gte(t,n_forced*3)" -vf "scale=trunc(oh*a/2)*2:min(ih\,1080)" -flags -global_header -sc_threshold 0 -output_ts_offset 00:03:51.000 -codec:a:0 aac -strict experimental -ac 6 -ab 320000 -af "adelay=1,aresample=async=1" -hls_time 3 -start_number 77 -hls_list_size 0 -y "/var/db/emby-server/transcoding-temp/c893d6372de4d5435a4b48f1993077af.m3u8"

a couple changes you could try are reducing audio channels:

/usr/local/bin/ffmpeg -ss 00:03:51.000 -i file:"/mpool/tvshows/Show/Show S01E02.mkv" -map_metadata -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 libx264 -pix_fmt yuv420p -preset superfast -crf 23 -b:v 7937968 -maxrate 7937968 -bufsize 15875936 -vsync vfr -profile:v high -level 41 -force_key_frames "expr:gte(t,n_forced*3)" -vf "scale=trunc(oh*a/2)*2:min(ih\,1080)" -flags -global_header -sc_threshold 0 -output_ts_offset 00:03:51.000 -codec:a:0 aac -strict experimental -ac 2 -ab 128000 -af "adelay=1,aresample=async=1" -hls_time 3 -start_number 77 -hls_list_size 0 -y "/var/db/emby-server/transcoding-temp/c893d6372de4d5435a4b48f1993077af.m3u8"

and switching to mp3

/usr/local/bin/ffmpeg -ss 00:03:51.000 -i file:"/mpool/tvshows/Show/Show S01E02.mkv" -map_metadata -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 libx264 -pix_fmt yuv420p -preset superfast -crf 23 -b:v 7937968 -maxrate 7937968 -bufsize 15875936 -vsync vfr -profile:v high -level 41 -force_key_frames "expr:gte(t,n_forced*3)" -vf "scale=trunc(oh*a/2)*2:min(ih\,1080)" -flags -global_header -sc_threshold 0 -output_ts_offset 00:03:51.000 -codec:a:0 libmp3lame -ac 6 -ab 320000 -af "adelay=1,aresample=async=1" -hls_time 3 -start_number 77 -hls_list_size 0 -y "/var/db/emby-server/transcoding-temp/c893d6372de4d5435a4b48f1993077af.m3u8"

[fengshaun 0]

Thanks! It seems it's the transcoding that's the problem. I have since tried to watch the same video with firefox on linux and windows and chrome on windows. Firefox on linux and chrome on windows are fine, but firefox on windows is not. firefox on linux transcodes to vp9 video and and vorbis audio. firefox on windows and chrome on windows have identical ffmpeg lines and try to do h264 using libx264 and aac audio:

 

 

-map_metadata -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 libx264 -pix_fmt yuv420p -preset superfast -crf 23 -b:v 2168083 -maxrate 2168083 -bufsize 4336166 -vsync vfr -profile:v high -level 41 -force_key_frames "expr:gte(t,n_forced*3)" -vf "scale=min(iw\,1280):trunc(ow/dar/2)*2" -flags -global_header -sc_threshold 0 -output_ts_offset 00:13:51.000 -codec:a:0 aac -strict experimental -ac 6 -ab 320000 -af "adelay=1,aresample=async=1" -hls_time 3 -start_number 277 -hls_list_size 0 -y

 

So, is it possible to change ffmpeg options in emby?

[Luke 36997]

did you try what i suggested?

[fengshaun 0]

Yes, sorry. aac with -ac 2 plays fine in vlc in both windows and linux. mp3lame doesn't support -ac 6, so I had to remove -ac 6 and then it played fine everywhere too. both play fine in both vlc on android and android's vanilla video player. Did you want any other information?

 

edit: both aac -ac 2 and mp3lame work with mpv on linux.

 

edit2: both also work with windows media player on windows.

Edited December 18, 2015 by fengshaun

[Luke 36997]

That's good, thanks.