Hi folks.
I’ve written a script which takes I want to process AVI movies in turn, resizing the video then adding a clip to the beginning (intro) and a clip to the end (credits). So far I’ve got the code below and its partially working, except the resize of the AVI isn’t working properly. Its just adding the video at its original size. I need to resize the AVI to 720x400 (the intro and credits clip are already this size).
I’d appreciate and help/input/recommendations on this. 
Thank you!
-- set paths to the intro and credits movie
set intro to "Users:scott:Desktop:source:intro.mov"
set credits to "Users:scott:Desktop:source:credits.mov"
set export_settings to "Users:scott:Desktop:source:settings"
-- write all movies to this file
do shell script "find /Users/scott/Desktop -iname '*.avi*' > /Users/scott/Desktop/movies"
set movieFile to ":Users:scott:Desktop:movies" as alias
-- open the movie resulting file and process each video
open for access movieFile
tell application "Finder"
set Names to paragraphs of (read movieFile)
repeat with nextMovie in Names
if length of nextMovie is greater than 0 then
tell application "QuickTime Player"
make new document
open intro
tell document 1
rewind
select all
copy
select none
end tell
close document 1 saving no
tell document 1
add
select none
end tell
open (nextMovie & ".tmp.mp4")
tell document 1
rewind
select all
copy
select none
end tell
close document 1 saving no
tell document 1
add
select none
end tell
open credits
tell document 1
rewind
select all
copy
select none
end tell
close document 1 saving no
tell document 1
set scale to normal
add
select none
end tell
-- now export using the settings file and give it up to an hour to process
with timeout of 3600 seconds
export document 1 to (nextMovie & ".mp4") as QuickTime movie using settings export_settings with replacing
end timeout
close document 1 saving no
end tell
end if
end repeat
end tell
close access movieFile