trying to convert 6 channel wave file to aac

[Luggas]

Hello,

i am trying to convert a 6 channel wave file to a 6 channel aac file.
my problem is, that channel 4 in the aac file is always without data. i tried to convert with fdk-aac, ffmpeg an neroaac but always the same problem.

maybe someone can help me.

Thanks,
Lukas

[Dooby]

https://forum.videohelp.com/threads/336915-How-to-create-7-1-channel-LPCM

Audacity can export AAC if you have Ffmpeg library installed.

Search the Help box for more.

[ProWo]

Clever Ffmpeg-GUI can do it.

[Dooby]

Clever Ffmpeg-GUI can do it.

All it needs is a video preview window, an audio editor with VST options, and a set of wheels!

It's good software, I'm just joking.

[Luggas]

Thanks for your replys.
I need to integrate a converter into my own sofware. so i am looking for an c++ lib.
i tried to export the file with audycity, but i get the message: "Your tracks will be downmixed and exported as a mono file.". are there any specific setting to choose?

[Dooby]

https://forum.audacityteam.org/t/files-are-mono-when-exported/32678/8

[cholla]

Unless you build ffmpeg with libfdk_aac you will not have it.
What you will have is the ffmpeg aac native codec.
cd\ to the location of your ffmpeg bin folder in the command prompt.
Then type this ffmpeg -codecs.
Then find the aac codecs your version of ffmpeg has.

Post the 6-channel .wav & I will see how it converts for me.
The ffmpeg in "ffmpeg for Audacity" does not have the libfdk_aac either.

Your ffmpeg code to get 6 channel should be something like this:

ffmpeg -i input.wav -c:a aac -b:a 320k -ac 6 output.aac

If you want the default bitrate you can just do this:

ffmpeg -i input.wav -c:a aac -ac 6 output.aac

[Dooby]

That's no good, then. I bet the native one is crap, or there wouldn't be a need for a licensed version. My bad.

https://github.com/m-ab-s/media-autobuild_suite

Only just realised the license was mentioned there too.

[cholla]

That's no good, then. I bet the native one is crap, or there wouldn't be a need for a licensed version. My bad.

Some believe the native one is even better.

I don't have a 6 channel .wav to work with.
Or if I do I would need to look for it.
If Luggas would post the one he is working with I would have a go at it.
I doubt it would be larger than the maximum allowed here.

[Dooby]

I read earlier the stereo output is okay, but the multichannel is not so good.
I don't use AAC to be honest; thought the native one would be okay, it being in the library.
My preferences are FLAC, WAV and mp3.

[cholla]

I wonder if Luggas found a way to do this.
He never posted a sample to work with.

[Dooby]

You suffer from 'Mother hen' syndrome, cholla?

[cholla]

Make that "Papa Rooster" syndrome.
Then maybe.