Use of textbox in text tracks

Question

I'm learning now how to add text to a Quicktime movie. In fact I can add text, and change some parameters in the text descriptor.
What I don't yet understand is how to use textbox: it seems to me that it doesn't behave as described in the QT Tutorial - Texty Descriptors:
Used to set the dimensions and location of the textBox relative to the other visible tracks. Example: {textBox:0, 0, 80, 320} top left of the movie window.
In fact whatever value I use the text always appears on top of the QT window, unless I manually modify the Offset values in the cmd-J window...
What am I missing ?
Thanks in advance
Piero

Answer 1

Thanks Kirk,
I know, and I saved and reloaded it every time into QT (7.1.6) and the target movie.
As an example, I list below the text file I'm testing. Its purpose is to show the timecode, and this works... just I'm not able to position it within the window using textbox. It seems the textbox descriptor has no effect: the rectangle (360x48) with the counter is always on the top left of the window whatever value I write in textbox. I also loaded 2 text tracks into the same movie, that are identical with the exception of the textbox values: and the counters overlap perfectly (you see only one of them). Only if I change the Offset value in the Property window for one of them I can see them in different positions.
{QTtext} {font:Geneva} {plain} {anti-alias:on} {size:16}
{textColor: 48400, 48400, 48400} {backColor: 0, 0, 0} {justify:center}
{timeScale:25} {width:360} {height:48} {textBox: 0, 0, 80, 720}
{timeStamps:absolute} {language:0} {textEncoding:0} {keyedText:on}
[00:00:00.00]
00:00:00
[00:00:01.00]
00:00:01
[00:00:02.00]
00:00:02
[00:00:03.00]
00:00:03
[00:00:04.00]
00:00:04
BTW: is there a better way than using a text track to display the timecode in QT Pro ?
Thanks again
Piero