IPhone refuse to sync some of my .mp4 files

I have made some mp4 video clips using iMovie. Most of them could sync to my iPhone with no problem.
However, my iPhone reject some of them with a message saying: "xyz.mp4 is not copied to the iPhone because it cannot be played" or something like that.
I have made many mp4 files over the years from DV source, I couldn't remember if I changed the resolution, codec, fps choices differently in some of them.
How can I find out why the iPhone is rejecting some of my mp4 files? They were all created using iMovie 5.
I assume iMovie 8 would have a preset preference settings optimized for iPhone or YouTube etc. When I use iMovie 5, I have to hand pick some of the setting values without knowing whether they will make a difference at the target device in terms of the video quality.

If you do a Ctrl-I in iTunes and look at the summary you can tell what the various parameters are.
In general the rule of thumb is:
1) No more than 640 (height can vary depending on widescreen, but no more than 480)
2) Data rate not greater than 1500 (and it's far better to err on the lower side -- even rates approaching this can sometimes not play).
I encode all my stuff at around 1000 total data rate, and it plays fine even on the 38" screen using component inputs from the iPhone. If you have stuff that exceeds this you can right click and "Convert to iPod" in iTunes and that should clear it up.

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    Message was edited by: ScottioUK

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