Copying QuickTime tracks from one movie to another

This is what I have so far:

on run
	choose file with prompt "Please choose QuickTime movies whose timecode to modify" of type "public.movie" with multiple selections allowed without invisibles
	open result
end run

on open droppedItems
	set source_folder to choose folder with prompt "Please choose folder where to reference timecode from"
	repeat with thisItem in droppedItems
		
		tell application "QuickTime Player 7"
			set themovie to open thisItem
			set thetracks to tracks of document 1
			repeat with thetrack in thetracks
				if the kind of thetrack is "Timecode" then
					copy thetrack
				end if
			end repeat
			
			make new document with name
			paste thetrack
		end tell
	end repeat
end open

The goal is to be able to pick a number of movie files and paste a specific track (in this case, the timecode track) from another movie with the same file name. I am stumped, however, at how to deal with individual tracks in QuickTIme via AppleScript. The code above results in an error saying that the copy message is not understood.

Any help would be greatly appreciated. Thanks in advance!

In order to copy/paste you have to select something first. The problem is that if you select something then that selection is made for every track of the movie. Therefore, in order to select only from the track you want you have to remove all of the other tracks from the movie first. Here’s an example. Suppose I wanted to copy the sound track from a movie and paste it into a new document…

set theMovie to (path to desktop as text) & "a.mov"
set trackName to "Sound Track"

tell application "QuickTime Player 7"
	set m1 to open theMovie
	
	tell m1
		-- first we delete all of the other tracks from theMovie
		-- we loop the tracks in reverse so the track numbers
		-- do not get out of sync as we delete them
		rewind
		set theTracks to tracks
		repeat with i from (count of theTracks) to 1 by -1
			set thisTrack to item i of theTracks
			if name of thisTrack is not trackName then
				delete thisTrack
			end if
		end repeat
		
		-- now we select and copy everything from theMovie so we can paste it
		select all
		copy
	end tell
	
	-- create a new movie and paste in the track
	make new document
	tell document 1
		select all
		paste
		rewind
		select at 0 to 0
	end tell
	
	-- close the original movie without saving
	tell m1
		close saving no
	end tell
end tell