Dynamically read height and width dimensions of .mov

Hi there!
I am wondering if anyone knows of a way to dynamically get the height and width dimensions of a quicktime movie, before streaming it?
The circumstances are this. I have clients who upload quicktime movies to my server. Right now, I use code to embed movies in a fixed size page, but the movies can vary quite dramatically in terms of their dimensions. For example, if the movie is 400px wide, it looks fine in my page. However, if it is 800px wide, it extends out beyond the borders of my page and looks terrible. I could just make a huuge page, but then the tiny movies look ridiculous
If I could somehow gets the dimensions of a movie before it starts streaming, i could create a large target page for larger movies, and a small target page for small movies. Basically it comes down to being able to somehow dynamically read the dimenions of the movie.
Is this even possible? Like my boss keeps telling me, it's all just Math isn't it?
Thanks!!!

Hmmm...
I think the movie dimensions are exposed to JavaScript, but only after the movie has opened. So you would have to load the movie into the plugin, then get the dimensions, then use JavaScript to rewrite the page. Which I don't think is quite what you had in mind; you're wanting to collect this information and deal with it before you write the page.
Let me see if I have this straight...You are allowing clients to upload movies to your server, and then you're hoping to generate an embedded movie page on the fly in PHP to display the movie just uploaded, correct?
For a library of movies, you could generate a small database of all the movie dimensions, then just look that data up in the table when you generate the page. The trouble is, I don't know of any way to get the movie dimensions except to get them from QuickTime, and to do that you have to load the movie into either the player or the plugin. You could, for instance, have an AppleScript that looks at each movie and populates the database, but I don't see how you could trigger that to run on upload, and I don't know what kind of server you're using.
Now here's an idea...If you have some way of arbitrarily reading and parsing the QuickTime file, you can get the dimensions out of the file, but it isn't easy. If you are lucky, the moov atom will include a prfl atom (movie profile) which includes the video dimensions. But the prfl atom is not mandatory, which means you have to look at each trak atom that contains video and examine the size *and position* and accommodate the fact that you may have multiple, overlapping video tracks. But you could get the data by parsing the QT atoms yourself. All the data you need to do that is here:
http://developer.apple.com/documentation/QuickTime/QTFF/QTFFPreface/chapter1_section1.html
...and may God have mercy on your soul!
Seriously, though, you CAN parse a QT file, and that might be the best (though obviously not the easiest!) way to get the data you want dynamically. QuickTime does help you out by giving you all the offsets for all the atoms, but it can be tricky!
--Dave Althoff, Jr.

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