Disk image moved between machines--shouldn't this work?

Hello, I am having a problem making a functional DVD. Here's the scenario:
I have a MacBook Pro (2009) with iMovie '09 installed, and I have a project I want to burn. The optical drive is broken, and the smart folks at Apple decided that they'd make it impossible for my shiny new external superdrive to work with my MacBook Pro. BUT, I also have a MacBook Air 2012 which can use the superdrive just fine. I can't transfer the iMovie project between machines--iMovie '11 has some terrible bugs when you try to import still photographs. So my solution was this:
--on the MBP, export the movie from iMovie as a quicktime .mov,
--open the .mov in iDVD (after experimentation, this gives MUCH better results than choosing "export to iDVD" in iMovie)
--in iDVD, save as a disk image
--copy the .img file (using a thumb drive) to the MBA
--Use Disk Utility on the MBA to burn the disk image just transferred onto a DVD using the external superdrive
Could someone tell me where this elaborate chain is likely to go wrong? The first disc I tried creating like this could be played on a computer using VLC (and the menu was operational, it wasn't just reading the video file), but it didn't work on either of the regular DVD players I tried.
Any help troubleshooting would be greatly appreciated. Here are the details of all the settings:iMovie 09 -> export using quicktime -> file type .mov -> compression type H.264, Frame rate current, Key frames automatic, compressor quality Best, encoding Best Quality, Data Rate automatic. In iDVD Preferences I chose NTSC (I'm in North America), encoding Professional Quality, and the correct DVD type (dual layer). In Disk Utility on the MBP I just dragged the transferred .img file into the left-hand pane, selected it and hit Burn.
When I transferred the .img file, that was all I transferred between machines.
Thank you!

the .img file was only ~700 MB (it's a short film). Should it have worked, in this case?
Don't know - May be ?
How can I find out whether it (the ext Hard Disk) is formatted as Mac OS extended?
• Select it on DeskTop/Finder (one Click)
• then go to File and down to Show Info - or - [cmd+I]
• read formatted as : nnnnnnnnnnnnnnnnnnn
And lastly I read elsewhere that DVD-R would be more reliable than DVD+R.
DVD+R are a more modern format and by so more reliable - BUT OLD DVD-Players can not read them so I chose them due to not knowing what player it will be played on.
And I think that if the DVD was able to be read on another computer, then it could not have had burn errors right?
No - but different devices has better or worse Error Correcting Functions - so keeping the amount of Burn Errors dowm = More devices can play them.
Good Luck.
Yours Bengt W

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