hum, don't know about the MPEG Multichannel. I though it was a replacement for AC3 in some countries, another way to zone in a certain manner but this tends to fall because dvd manufacturers(as for zoning process ) did put all the hardware and software to cope with both formats. I found a thread here discribing what Crazy Bob talked about.
As far as I read on this subject, VCD isn't as fancy and rich as SVCD or DVD. Quite limited specifications, no place for nice tweaks here. Audio and video formats are very restricted.
Maybe Crazy Bob is talking about some non standard tweaks as such involved to create so called XVCD or XSVCD, which could be taken by a few DVD players. See link above.
A safer (but much harder way) is to play regular VCD with audio modified in a way that in association with a dolby prologic or better amp (at least one which can expand simple stereo sound on all the 4, 5, 6, 7, (more ? :eek: ) speakers), sound will appear to be "surrounded".
By using BeSweet, you can explode AC3 into some wav and tweak the stereo part by injecting with your favorite sound editor the front and rear channels as you want, thus producing simple stereo audio track, fully compatible with VCD standards.
But I know near to nothing about it: the surround is recreated by dolby surround amp by taking into account phase information which is small shift between left and right audio. I can't talk any further as I know nothing beside that.
I believe to remember that some flavours of soundforge has a module which process multichannel audio.
And chances are all this isn't necessary for usual purposes as BeSweet processes this automatically. Here for BeSweet AC3toMP2 tutorial
As I wrote this, I although crawled through the web and found this which is exactly what I thought about ! HeadAC3he v0.23a which allows you to fine tune all the speakers involved to produce (stereo) MP2.
Maybe a reason to forget what I wrote above.
One thing to conclude: audio phase information is often lost or worse, massacred when converting source to low bitrate MP3 using joint stereo (less with mid-side stereo, a lot with intensity stereo). MP2 is mpeg 1 layer 2 is worse than layer 3, and according to BeSweet, have to be encoded in joint stereo (don't know if it is in the VCD standard or if it's there to enhance the overall quality (aware of pro/cons of joint stereo vs simple stereo ? (pro) a way to distribute optimally the bitrate jugging on the stereo separation, (cons) sounds less stereo, loss of phase).
Pffiou I hope not scaring you too much (and although not talking nonsense !).
I have all the hardware to test but have some problems with it :a so don't expect from me a fast "test reply".
Have some sample tests (same sample video multiplexed with some according audio tweaked mp2 ) and see by yourself. That's what I will do when my hardware will cooperate.
Stay tuned, email notification on
Don't hesitate to post here if something isn't quite clear or to describe your hardware.