Audio quality when 5.1 transcoding on the server

[fracarvic 1]

With latest versions of Android TV app and emby server when I play mkv with 5.1 audio (ac3) the server does remuxing, the video stream are copied (great, quality is perfect) and audio are transcoded from 5.1 ac3 to 5.1 aac.

 

This works perfectly, but seems that audio quality is degraded a lot. The ffmpeg command line that I can see on server is :

/bin/ffmpeg -ss 00:30:33.310 -fflags +genpts -i file:"/shared/videos/peliculas/Life Cycles (2010).mkv" -map 0:0 -map 0:1 -map -0:s -codec:v:0 copy -bsf:v h264_mp4toannexb -map_metadata -1 -map_chapters -1 -threads 0 -codec:a:0 aac -strict experimental -ac 6 -ab 128000 -af "aresample=async=1" -y "/config/transcoding-temp/37d104e09605e0b8f83391cdb35cd1ca.ts"

The 5.1 aac audio stream are encoded at 128 kb/s, wich seems perfect for stereo but seems low for 5.1. I read somewere that a value of 320 kbits/s is perfect for 5.1 audio. ¿ Can you increase the bandwith when encoding 5.1 aac ?

 

Thanks.

 

 

[Luke 42079]

Hi, welcome. Can you please attach the complete log? thanks.

[fracarvic 1]

Yes, of course.

Log.txt

[Luke 42079]

@@fracarvic, thanks we're looking into it.