How do I divide a long h.264 .mp4 into smaller movies?

I have 2.5 hrs of .mp4 movie in h.264 format that I would like to divide into 1/2 hr units.
1. I find it very difficult to get my crops accurate in QT.
2. When I save it it saves a .mov, just changing the file type to .mp4 in Finder renders it unreadable
3. Exporting to mpeg4, which I presume will create an .mp4 file, takes forever
There has to be a better way surely.
Can anyone help? Much appreciated.

Use the Movie Inspector window and some keyboard shortcuts to get accurate "cuts". The left/right arrow keys move one frame at a time. Hold down the Shift key as you tap the arrow keys to expand or reduce your selection. Letter i and o keys set in and out points to make a selection.
Once you have your selection use Command-C (copy), open a new (empty) Player window and Command-V (paste). Save As to make a new file.
Switch back to your longer file. If you no longer need your current selection simply hit the delete key. Repeat the steps above until your made all your "parts".
When you get to your final selection and just Save As to make a new file. Close the older window and make sure not to save "changes" when you close the window. This will leave your original file untouched by these edits.
These new files will be identical to your source but will be in a .mov container. No need to edit the file extension or export again.

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How do I divide a long h.264 .mp4 into smaller movies?

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