adding secondary audio to mp4

[xtwist3dx]

ok i have a movie in Mp4-H.264-AAC+AC3 and i also have the movies audio file for 5.1 surround and i need to know how to add the 5.1 audio to the file to replace the 2 channel that is embedded already

i looked around for a bit, but not knowing where to look hurt me
i dunno if its authoring or what
so any help will be appreciated

[Baldrick]

Tried YAMB?

[xtwist3dx]

no i havent and thanks for the quick response
ill try that now

[xtwist3dx]

yamb doesnt seem to support ac3 audio
when i went to import the ac3 audio in the "all supported formats" it didnt see it in the folder where it is stored

any ideas how to get it to support it or another program?

also sorry i didnt specify in the first post that it was the 5.1 audio that was ac3

[poisondeathray]

.mp4 container doesn't fully support AC3

You can put several audio tracks into an .mkv container with mkvmergegui

EDIT: apparently as of August 2008, the .mp4 specs now support AC3 (but this doesn't mean all players will play it properly). You can try mp4muxer

http://forum.doom9.org/showthread.php?t=23084

[xtwist3dx]

well in that case does aac support 5.1 audio?
if it does i can just reencode the ac3 to aac
i want to keep the mp4 so i can play it on my xbox 360

[poisondeathray]

AAC supports 5.1 audio, but xbox360 doesn't

http://blogs.msdn.com/xboxteam/archive/2007/11/30/december-2007-video-playback-faq.aspx

[xtwist3dx]

ok thanks for all of your help
too bad 360 doesnt seem to support 5.1 in any type of mp4