Further info re iMovie -2002 error
I have spoken with Apple support. They have reproduced and confirmed this as a problem with iMovie '08 when exporting with Quicktime.
I have confirmed that
an upgrade to iLife'11 does resolve this problem, but this needs OS 10.6.3 or higher to run, and hence is not necessarily an option for all users of iLife '08.
Upgrade to iLife '09 likely also resolves this problem, but I have not been able to confirm this personally, and with the release of iLIfe '11, hard to get a copy now.
Outside of these options there appears no work around to export an HD movie (eg 1280 x 720), with sound, in .mp4 format with iMovie. It is only this combination for export that is affected.
I found this combination is of value if I have a presentation with diagrams or graphs (clarity with detail important), and I want a format that is widely accessible to most users whatever their OS (eg sending to govt depts with Windows users who may not have the authority to just download Quicktime player on their work machines).
Having raised it, I have requested this fault be followed through so my understanding is that an update to resolve this issue may be released (either for Quicktime or iMovie '08) - for those Mac users unable to upgrade. So look out for an update for one of these before the end of 2010, or early 2011.
If this post proves of value to you, please leave a post so I know the effort to follow through was appropriate to resolve this issue with
Apple.
I thank the apple people I spoke with for their efforts also.
CmactalkAust.