White edge on black mask?

I created a black rectangular frame size 720x480 about 10 pixels wide, with a transparent interior, as a Photoshop file, and used QT Pro to add it as a video track in a layer above a completely black video, also 720x480. You'd think the combination would yield a completely black video, but in fact there is a thin white edge of the inside of my black frame showing.
The same thing happens when I just put a mask of a 10 pixel frame on the video itself. To keep QT from resizing the whole video in this case (because it loses the masked out portion) I added a solid black 720x480 still image behind the video. When my frontmost video has a picture, it plays OK surrounded by a black frame, but when the picture goes black, I still see a thin white rectangle remains.
I tried exporting this as a MOV file and viewing it in iMovie, and I still see the thin white rectangle.
Why the white artifact and any suggestions how to get rid of it?
PowerMac Dual G5   Mac OS X (10.4.1)  

I've noticed it since QT 6 with some of my skin track movies.
It seems the default offset 0,0 (upper left corner) becomes 1,1 which would leave a one pixel line at the bottom and right side. Trying to adjust the offset on the track never worked for me.
I ended up using a track dimension one pixel smaller for the "transparent" area.
If you're trying to crop via a mask you'll be better served using MPEG Streamclip as the other poster has noted. It can work with .mov files, too.

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