Emby (ATV app) detecting audio as STEREO, but TV detects it as AC3

[CBers 6771]

As per the title, using the Emby ATV app on my Shield TV, the audio in my IPTV streams are being detected as AAC stereo, whereas my Samsung TV with the SMART IPTV app installed, is detecting it, and playing it, as AC3 (DD).

 

This is the ffmpeg directstream log:

 

http://192.168.1.150:8096/emby/videos/427f9e28cf039fd72b2a0d2166d9f3eb/live.m3u8?DeviceId=8651bed2b2287880&MediaSourceId=93e4b55e977c489e8a41191fbdac6dc1_4f34e117ad0a56778ce134631ddce88a&VideoCodec=h264,mpeg2video,hevc,h265&AudioCodec=ac3,dts,dca,dtshd,aac,mp3&AudioStreamIndex=1&VideoBitrate=109850000&AudioBitrate=150000&MaxAudioChannels=8&PlaySessionId=86cc741351fa4ec8b864ea512728853d&api_key=d081cd204de64430a9397db5bd8e647e&LiveStreamId=a17c75760a04e99b68cf766e11316e1c_09efa0d56b934a82adec00a87b837fb0_93e4b55e977c489e8a41191fbdac6dc1_4f34e117ad0a56778ce134631ddce88a&CopyTimestamps=true&EnableSubtitlesInManifest=false&RequireAvc=false&RequireNonAnamorphic=false&DeInterlace=false&SegmentContainer=ts&MinSegments=2&BreakOnNonKeyFrames=True&TranscodeReasons=ContainerNotSupported,VideoCodecNotSupported,AudioCodecNotSupported

{"Protocol":"Http","Id":"93e4b55e977c489e8a41191fbdac6dc1_4f34e117ad0a56778ce134631ddce88a","Path":"http://IPTVPROVIDER/51.ts","Type":"Default","Container":"mpegts","IsRemote":true,"ReadAtNativeFramerate":false,"IgnoreDts":false,"IgnoreIndex":false,"GenPtsInput":false,"SupportsTranscoding":true,"SupportsDirectStream":true,"SupportsDirectPlay":true,"IsInfiniteStream":true,"RequiresOpening":true,"RequiresClosing":true,"SupportsProbing":true,"LiveStreamId":"a17c75760a04e99b68cf766e11316e1c_09efa0d56b934a82adec00a87b837fb0_93e4b55e977c489e8a41191fbdac6dc1_4f34e117ad0a56778ce134631ddce88a","RequiresLooping":false,"MediaStreams":[{"Codec":"h264","TimeBase":"1/90000","CodecTimeBase":"1/50","NalLengthSize":"0","IsInterlaced":false,"BitRate":8000000,"BitDepth":8,"RefFrames":4,"IsDefault":false,"IsForced":false,"Height":720,"Width":1280,"AverageFrameRate":25,"RealFrameRate":25,"Profile":"High","Type":"Video","AspectRatio":"16:9","Index":0,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"PixelFormat":"yuv420p","Level":31,"IsAnamorphic":false},{"Codec":"aac","TimeBase":"1/90000","CodecTimeBase":"1/48000","DisplayTitle":"AAC stereo","IsInterlaced":false,"ChannelLayout":"stereo","BitRate":150000,"Channels":2,"SampleRate":48000,"IsDefault":false,"IsForced":false,"Profile":"LC","Type":"Audio","Index":1,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0}],"PlayableStreamFileNames":[],"Formats":[],"Bitrate":8150000,"RequiredHttpHeaders":{},"AnalyzeDurationMs":2000,"DefaultAudioStreamIndex":1}

C:\Users\Media\AppData\Roaming\Emby-Server\ffmpeg\20160410\ffmpeg.exe -analyzeduration 2000000 -f mpegts -i "http://IPTVPROVIDER/51.ts" -map_metadata -1 -map_chapters -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 copy -flags -global_header -vsync cfr -codec:a:0 copy -f segment -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero -segment_time 3  -individual_header_trailer 0 -segment_format mpegts -segment_list_entry_prefix "hls/fb87f9e271d9b262475cb1fba22f5da7/" -segment_list_type m3u8 -segment_start_number 0 -segment_list "C:\Users\Media\AppData\Roaming\Emby-Server\transcoding-temp\fb87f9e271d9b262475cb1fba22f5da7.m3u8" -y "C:\Users\Media\AppData\Roaming\Emby-Server\transcoding-temp\fb87f9e271d9b262475cb1fba22f5da7%d.ts"


ffmpeg version N-79277-g0c90b2e Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 20.100 / 55. 20.100
  libavcodec     57. 34.100 / 57. 34.100
  libavformat    57. 32.100 / 57. 32.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 41.100 /  6. 41.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mpegts, from 'http://IPTVPROVIDER/51.ts':
  Duration: N/A, start: 1670.880000, bitrate: N/A
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 136 kb/s
    Stream #0:2[0x102](und): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
Output #0, segment, to 'C:\Users\Media\AppData\Roaming\Emby-Server\transcoding-temp\fb87f9e271d9b262475cb1fba22f5da7%d.ts':
  Metadata:
    encoder         : Lavf57.32.100
    Stream #0:0: Video: h264 ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn, 25 tbc
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, 136 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  621 fps=0.0 q=-1.0 size=N/A time=00:00:24.83 bitrate=N/A speed=27.7x    
frame=  651 fps=343 q=-1.0 size=N/A time=00:00:26.03 bitrate=N/A speed=13.7x    
frame=  681 fps=235 q=-1.0 size=N/A time=00:00:27.23 bitrate=N/A speed=9.39x    
frame=  711 fps=182 q=-1.0 size=N/A time=00:00:28.43 bitrate=N/A speed=7.29x    
frame=  737 fps=150 q=-1.0 size=N/A time=00:00:29.47 bitrate=N/A speed=6.01x    
frame=  767 fps=130 q=-1.0 size=N/A time=00:00:30.67 bitrate=N/A speed= 5.2x    
frame=  794 fps=115 q=-1.0 Lsize=N/A time=00:00:31.75 bitrate=N/A speed=4.59x 

Normal playback of AC3 videos play fine through the Emby ATV app, it's just Live IPTV that is the issue.

 

Thanks.

Edited June 26, 2017 by CBers

[ebr 14918]

According to ffmpeg, that stream only has an AAC audio track.  Can I see the ffmpeg log from playing back the exact same stream in the other app?  Is it possible your TV is converting it...?

[CBers 6771]

The other app is a Smart TV app, not an Emby app.

 

Just tried it in the Emby for Samsung Smart TV (Orsay) and it is transcoding/copying both audio and video:

 

Stream #0:0: Video: h264 ([27][0][0][0] / 0x001B), yuvj420p, 1280x720, q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, 130 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)

Isn't AAC stereo though?

 

Not sure if my TV automatically upmixs to DD, but there are definitely no options in the TV menu to manage it.

 

@@FrostByte - do you know?

 

 

.

Edited June 26, 2017 by CBers

[FrostByte 5051]

I don't use LiveTV.  However, AAC and AC3 both Direct Play using the Emby Orsay app for streaming video and neither are converting for me.  My HTS supports both those codecs and is hooked up via ARC so no need to convert.  Does your soundbar support AAC?  If it only supports AC3 I would assume something is converting it if Emby server itself isn't

 

AAC doesn't have to be stereo, the XB1 ET app converts AC3 5.1 to AAC 5.1

[CBers 6771]

Yes, my soundbar plays back AAC without converting.

 

I've just installed the same Smart IPTV that I have directly on the TV and is is also outputting stereo, so perhaps it's a Shield/HDMI issue.

[Luke 37091]

Your TV could be converting to AC3, also the provider could be customizing the stream based on the user agent of who is connecting. That is unlikely, but possible.

[ebr 14918]

I bet the TV is converting it.  The above info out of ffmpeg clearly shows the source as stereo (at least the one we're getting).

[SamES 891]

@@Luke, Orsay app needs to add mp2 audio for direct play as per recent update for Tizen, thanks