Associating audio tracks with different groups?

[FallenAngelII]

iPod Classic has an option called Alternate Audio which supposedly lets you hear an alternate audio track than the main one for your movie. The only problem is I've never gotten it to work. How do I get it to work?

I have no idea what this means or how to do it, but apparently I need to (in order to get alternate audio tracks to play on the iPod. Handbrake does it and tracks passed through Handbrake will play on iPod Classic with alternate audio tracks).

Preferrably through MP4Box but any program is fine as long as I can still encode my stuff through meGUI.

So how exactly do I do that? One of the developers for Handbrake tells me that I need to, and I quote:
"Are they being associated in an alternate group though?"
"it means the audio tracks need to include the alternate group property in their headers and set them to the same value"

So... how do I do this in, say, MP4Box (Gui or CLI, either way)?

[Ai Haibara]

To be honest, I don't think Apple's let many people know how to insert alternate audio streams or subtitles in their iPod-compatible video files. I haven't seen any information about either, yet, and you'd think some of the converters that create iPod-compatible video would have hints of options along those lines by now, if the information was out there, somewhere.

Which isn't to say that someone can't experiment and try to mux dual-audio or subtitle streams into an mp4, then test it on an iPod. I'd consider it, if I had a relevant iPod around to test.

[FallenAngelII]

Apparently Handbrake is able to do it (multiple audio streams), but I can't get Handbrake to work with even half of my DVDs.

[FallenAngelII]

I have no idea what this means or how to do it, but apparently I need to (in order to get alternate audio tracks to play on the iPod. Handbrake does it and tracks passed through Handbrake will play on iPod Classic with alternate audio tracks).

Preferrably through MP4Box but any program is fine as long as I can still encode my stuff through meGUI.

So how exactly do I do that? One of the developers for Handbrake tells me that I need to, and I quote:
"Are they being associated in an alternate group though?"
"it means the audio tracks need to include the alternate group property in their headers and set them to the same value"

So... how do I do this in, say, MP4Box (Gui or CLI, either way)?