Jump to content

Second Audio Track - Wrong Information


centuryx476
 Share

Recommended Posts

centuryx476
Posted (edited)

Hello,

I have an odd one and I do not think it is emby directly. Read to the end....

I'm encoding some movies into HEVC using Hardware Acceleration. I decided to have two audio tracks (1. Original Audio Passthru, 2. AAC Track @ 960K). When I view the data in emby the second AAC audio track is wrong. It is being reported as 320K.

2031921906_FirstPic.jpg.113f41dd22b52897768decd28d02e01c.jpg

So I figured maybe its the file itself. Here is the audio mediaInfo on the file.

1848157759_SecondPic.jpg.bc96dbabeadf9c0ac22c48e40faec83b.jpg

Perhaps it is the FFmpeg commands I am using for the audio. This is the main list of commands I have come up with for encoding HEVC with two audio tracks. Mind you the titles and names of the metadata for the audio tracks can change from title to title.

I am not really sure why the second audio track is being mis-read.

 

ffmpeg -y
-vsync 0
-hwaccel cuda
-i "inputFile.mkv"

// First Audio Track (Source) Commands
-map 0:v
-map 0:a:0?
-c:a:0 copy
-metadata:s:1 title="Surround 5.1 Track"
-metadata:s:1 handler="Surround 5.1 Track"
-metadata:s:1 language=eng

// Second Audio Track (AAC) Commands
-map 0:a:0?
-c:a:1 aac
-metadata:s:2 title="AAC Track"
-metadata:s:2 handler="AAC Track"
-metadata:s:2 language=eng
-b:2 960K
-ac:2 6
-filter:2 aformat=channel_layouts=6.0

 

 

 

 

Edited by centuryx476
Link to comment
Share on other sites

rbjtech

3214 Kbps AAC track ?

I'm not surprised it's confused - that is WAY too high - it's probably defaulted to 320K.

A typical 5.1 AC3 file should result in a ~320K AAC file - not 3214K .. that is HD Audio territory (no compression) .. ;)

Link to comment
Share on other sites

roaku
16 minutes ago, rbjtech said:

3214 Kbps AAC track ?

I'm not surprised it's confused - that is WAY too high - it's probably defaulted to 320K.

A typical 5.1 AC3 file should result in a ~320K AAC file - not 3214K .. that is HD Audio territory (no compression) .. ;)

Ya, the media info is also saying the aac conversion is the same size as the original 24 bit uncompressed source.

I don't keep ffmpeg commands in my head, but I suspect the one above isn't quite right.

  • Agree 1
Link to comment
Share on other sites

centuryx476
Posted (edited)
37 minutes ago, rbjtech said:

3214 Kbps AAC track ?

I'm not surprised it's confused - that is WAY too high - it's probably defaulted to 320K.

A typical 5.1 AC3 file should result in a ~320K AAC file - not 3214K .. that is HD Audio territory (no compression) .. ;)

In my command I am telling it to do 960K. But its not doing that

Edit: I think I figured it out. Need to verify now

Need to remove "-map 0:a:0?" from the second audio track command

 

// Second Audio Track (AAC) Commands
-map 0:a:0? - Remove this
-c:a:1 aac
-metadata:s:2 title="AAC Track"
-metadata:s:2 handler="AAC Track"
-metadata:s:2 language=eng
-b:2 960K
-ac:2 6
-filter:2 aformat=channel_layouts=6.0

Edited by centuryx476
Link to comment
Share on other sites

centuryx476
Posted (edited)

So I kinda got it to work.

But I had to use MKVToolnix.

I do not know how to translate what I did there into an ffmpeg command

427194667_ThirdPic.jpg.0179f59664c97a014fc446a9eba02b91.jpg

But in emby it defaults to 320K

2069649275_FourthPic.jpg.676c5fb97ab8ddb962dcaca0d2d79296.jpg

Edited by centuryx476
Link to comment
Share on other sites

centuryx476
Posted (edited)

I've given up on figuring out why ffmpeg is doing this. I think I am overlooking something!

Edited by centuryx476
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...