so the footage that was shot was Apple Intermediate Codec?
or converted to that?
that could be the issue.
try & change your compression setting in your sequence settings from Apple Intermediate Codec to Prores 422
when you view your sequnce is it 16X9 in FCP?
the only thing i can think of is when you export using QT conversion you are selecting the wrong settings.
If you export using QT - current settings the export will match the edit.
did you cut a clip into a new sequence ?
and you got the same sequence settings as stated above?
i thought you used the wrong settings based on the info you provided.
in other words you posted clip settings that were 720 X 480 with a DV codec
& you had seqeunce settings for HDV.
saying you guarantee it is HD doesnt always make it the case.
HDV isnt HD anyway, but whatever. your settings match, so this should work for you.
i had told you what settings I would use - 1440 X 1080, upper, 29.97, prores 422.
did you try changing that in your sequence settings?
failing that - if your edit looks fine in FCP - ie. it is 1440 X 1080 & 16 X 9 & looks good,
and your QT export with QT conversion looks fine , then my guess is the iDVD project is set to
4:3 & not 16 X 9.
have you opened the QT you exported out of FCP & looked at it?
does it look ok visually?
if you open it in QT & select command - i it will also show your clip specs
they do match right?
it could be that the HDV footage is having issues in the conversion for the DVD, which is why it is often better to go through compressor & then DVDSP as you have more control.
HDV can be finicky during this process, and there are lots of issues it can create depending on your fooatge.
anyway, i am out for the night, so good luck.
if nobody else comments on here tonight i can help you tomorrow.