Error when merging large clips in QuickTime

I am trying to merge two 2-hour clips into a 4-hour clip in QuickTime (OS X 10.7.2). If I combine very short clips and export for iPad all works. But the long clip combination generates an error "The operation not supported for this media." What is the problem? Is there a size limit I don't know about?
What is the encoded resolution and file size of each file? While HandBrake generates iPad files using "Large File" addressing, the QT X player may or may not be programmed to use this mode for smaller resolutions based on the contextually adaptive nature of the preset. Just a guess, but it is possible the QT X player may refuse to "export" the content if the target file is projected to exceed 4 GBs or exceeds the available memory required to perform the processing of the files.
If true, then depending on the original source files' compression format(s) and apps available, I might try one of the following:
1) Create a merged "reference" file containing the two source files using QT 7 Pro or create a single "merged" file from the two source files in a single wrapper and then use HandBrake to make a single conversion/export to the target iPad compression format.
2) Use QT 7 Pro or MPEG Streamclip to save the data in the two M4V files to a single MOV file (without recompressing the data) and checking to see if this file can be imported/managed by iTunes for use on your iPad.
3) Try a lower resolution export from QT X to see if this obviates the error message.

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