aac transcoding...

[Monotone]

I desire a method of converting 5.1 aac audio (*.aac) to 5.1 ac3. I have experimented with various tools but nothing seems to work properly. Does anyone know a way to do it?

[Sakuya]

I was also wondering if I can do this. I'm not sure if my receiver can play AAC. Besides, I don't think my authoring programs support AAC either. I have TMPGEnc DVD Authoring (mainly used), Nero 6 (rarely used), and DVDAuthorGUI.

I have installed CoreAAC but neither GSpot nor VdubMOD recognize a file type known as .AAC. How can I demux to AAC using VdubMOD? If anyone can help me converting AAC 5.1 to AC3 5.1, it'd be most appreciated.

[virendra]

If you have Nero 6 installed , then I think this is possible. But you will need Nero ac3 plug-in installed which is not free.

You can open the encode options in Nero and select ac3 and select 5.1 in settings instead of stereo.

I am not too sure as I have never worked with AAC files but Nero has that option.

[Sakuya]

Do you mean Nero SoundTrax? I tried to open the AAC file but SoundTrax only supports MP4 files (it states that it's (AAC) but the file format has to be MP4).

If I can decode AAC to a WAV and then convert that WAV to 6 mono WAVs and after that, piece it together into a 5.1 AC3? Is that possible? However, I don't know of any programs to decode and I don't know the order of the sounds after it's split. Any help is appreciated!

[celtic_druid]

ffmpeg should be able to convert 5.1aac to 5.1AC3. Not sure about channel mappings though.

BeSweet should also be able to handle it.

If you need an mp4, then you could always use say mp4box to mux you aac to mp4.

Coreaac is a dshow aac decoder. It won't help with VDubMod and for dshow you also need an aac spliter/source filter.

[Sakuya]

I searched around on other forums and I used faad2, a command line, to decode the AAC 5.1 to WAV. So now, I've got a 6ch WAV file. I'm not sure what to do next. Should I be converting that WAV directly to AC3 5.1 or should I split it up into 6 mono WAVs and then inputting them one by one into Soft Encode to get the AC3 5.1? Another thing is the channel mapping.