Does it matter if the AC3 or DPLII track comes first?

[L255J]

Can someone explain what happens if one track is put in front of the other? Does the first track become the default? Does it even matter?

[rhester]

AAC first is recommended, particularly for devices that only support one audio track (and don't grok AC3).

Rodney

[L255J]

Thank you!

[Deleted User 13735]

YMMV.
I put the 384Kbs AC-3 (passthrough) track first, and the 160Kbs AAC track second.
VLC plays the AC-3, but my Vegas editor (which doesn't understand AC-3 with MP4) still finds and opens the AAC.