Is there a good way to "debug" a QuickTime

The subject of my question is a little misleading, but I couldn't think of a better way to phrase it.
Until recently, I've done all my work in ProRes 422 (not HQ) using 8-bit rendering. Naturally, I expect that all my finished QuickTimes coming out of Final Cut have had 8-bit video in them. This has been fine.
But yesterday I rendered a graphics project out of After Effects that exhibited some pretty nasty banding. "I know," said I, "I'll make this a 16-bit project, then render out to a 10-bit ProRes movie."
I went through all the necessary steps to do this — since this isn't an After Effects forum I won't go into details, but feel free to ask if it sounds like I need to be checked on these — and got a resulting QuickTime movie that … looked exactly like the first one.
This got me scratching my head, so I went back into Final Cut, took some 8-bit footage I'd shot on my camera and dropped it into two ProRes 422 (HQ this time, just for safety) timelines, otherwise identical except for the "render all in high-precision YUV" option which was ticked on for one and off for the other.
I applied the same ridiculous three-way-CC filter to each clip, and rendered them out as self-contained QuickTimes.
Opening each movie in QuickTime Pro and looking at the info inspector reveals that they're each a 1440x1080 ProRes 422 (not HQ) movie with "millions of colors." Specifically not "trillions of colors."
Are there any good tricks or tools for peeking inside a QuickTime file and finding out exactly how the video is stuffed in there? Is there a good tool that I can use that will tell me, for example, "Hey, this QuickTime contains movie data encoded with the ProRes 422 compressor, stored as 10-bit YUV," or whatever?
Cause of course one possibility is that one of these movies really is 10-bit and the other really is 8-bit and QuickTime Pro is just wrong about the "millions of colors" thing. But the other possibility is that I messed something up in my workflow, and both of these movies really are 8-bit, despite my telling Final Cut specifically to use high-precision rendering for one of them.
Any suggestions?

Well, there are settings you can change in QuickTime Player to improve it's playback. Look in the Window menu to see the properties and inspect the QT movie.. there is a button to turn on in the Inspector so it plays at "high quality".. it's not the default setting, and will show you all the quality you have. Plus viewing interlaced material on a computer display will never look all that great, because the computer display is progressive, not interlaced... need to always judge things externally on a video monitor because of this, or add a Matrox MXO to your system to change the nature of the computer display so it becomes a video monitor in essence.
BUT any time you put a clip in a sequence in FCP, it changes it's format to match the format that the sequence itself is set to be. So if you put a 10 bit clip in a sequence set to render in 8, it becomes an 8 bit movie.
HTH
Jerry

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