Quicktime converting 24 bit images to 16 bit images on paste

I am doing image processing of a QuickTime (7.1.5 pro) movie in Photoshop (CS2) using Applescript. When I copy an image (either with Applescript or manually) and paste it into a new QuickTime Player movie the image gets converted to a video depth of 16 (thousands) rather than 24. I have tried:
set DestMovie to make new movie with properties {data rate:SourceRate, video depth:24, high quality:true} -- I also tried video depth:0
paste
I also try:
tell movie 1
paste given video depth:24 -- I've also tried just paste
end tell
and still it converts my images to thousands. The image gets to photoshop perfectly. If I paste it into a Pages document the image depth is correct. I have tried both RGB and CMYK in 8 and 16 bit depths in Photoshop. If I save the file as JPEG in high quality mode and then open the file with Quicktime and copy and paste it, it works great, the only problem is I then have to make a new file for every image I process because if I close the file, QuickTime keeps it open so Photoshop can't then save to the same file.....
Will someone please help me figure out how to keep my image quality on pasting into Quicktime???
Thanks
Powerbook G4 Mac OS X (10.4.9)

I open my original movie in Quicktime. I make a new movie in Quicktime for the modified images to be pasted into.
I copy the current frame from my source movie and paste it into Photoshop. I do my image processing and then save as a jpeg high quality and close my file (which strips out the audio from a muxed mpeg-1 file) then reopen the file in Photoshop. Now I have a good quality image in Photoshop. I have been using RGB 8 bit as my mode in Photoshop. I only tried CMYK to see if it would work better. It was exactly the same.
I then do a select all and copy in Photoshop, then go to Quicktime and do a paste. This is when it gets converted to 16 bit depth. If I do the same exact sequence and paste into a Pages document the image stays 24 bit, so I am pretty sure it is something in Quicktime.
Again, if I save the file in Photoshop and then open the same file in Quicktime, copy the image and then paste it into my destination movie, it works great. The only problem with this method is I have 15 minutes of video to process with is 27,000 jpeg files in the end. I prefer to use one file if I can. The reason for the 27,000 files is that when I open an image in Quicktime and paste it into a movie, it saves it as a track in the movie and even when I close the original file, Quicktime keeps it as in use. When I look at the movie properties, it keeps the original file in the list until I do a save as movie and it flattens the movie. If I flatten the movie once, then when I do another save, it keeps the original file open again. I would have to do a save as movie... again 27,000 movie files now. Geez...
Thanks!

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