MKV to MP4 for PS3 with dual-audio (2ch AAC + 6ch AC3)

[sexyclient]

Hi! I have a video file in MKV format:
track1 - video: 720p, avc h264
track2 - audio: 6channel, a52 ac3
track3 - subtitles: srt
I'm looking to convert (remux) this to a dual-audio, MP4 format file that can be played back on a Playstation 3. My objective is to make the guts of my new MP4 file contain everything that the MKV has but also another audio track:
track4 - audio: 2channel, aac

I know that converting MKV to Playstation/Xbox compatible mp4's has already been addressed - actually, I already found a useful guide and have all of my raw video, audio, and subtitle tracks ready to be muxed into an MP4 (I'm using MP4Box)!

The next step, however, is where I'm at a loss on how to proceed. In the guide(s) I used (found here (http://oddmanout.wordpress.com/2008/01/26/converting-an-mkv-h264-file-to-ps3-mp4-without-re-encoding-on-mac-os-x/) and here (http://ubuntuforums.org/showthread.php?t=811826&highlight=mkv+to+mp4+ps3)), I've been instructed to use HEXEDIT to change some numbers in the h.264 video file so that the video can be compatible with the new 2-channel AAC audio.

If I need to make these changes to the video tracks file to make it compatible with the 2channel AAC audio track, then will this change also break the video tracks compatibility with the 6channel AC3 audio track? Do I need to do something else to make my video stream dual-audio compatible? Also, do I need to add the tracks (I'm using MP4Box) in a specific order for my ps3 to read the file correctly? Someone please help me out, I'm lost!

[Guest]

Why don't you encode from your original DVD rather than an MKV? Where did you get the MKV?

[sexyclient]

Why don't you encode from your original DVD rather than an MKV? Where did you get the MKV?
Unfortunately most of the original DVD's have all deteriorated to the point of unreadability or have been lost. It's a video montage.

[CWR03]

Unfortunately most of the original DVD's have all deteriorated to the point of unreadability or have been lost.
"Original DVD's" do not deteriorate.

[sexyclient]

"Original DVD's" do not deteriorate.

And just what exactly is it that you're trying to imply? If you've got something to say then just say it, but don't dick me around and try to hide behind such a thinly veiled "justification" as my grammatical or linguistic inaccuracy -- because I'm quite sure you understood my implication that the source discs have been worn out from daily use...

True to form, I'll get straight to the point: I would appreciate it (very much) if you can help, but if you're going to troll then I'd ask you to please do it somewhere and to someone else.