Playing .mp4 files via QuickTime in the Browser

Documenting an hour's worth of frustration.

No video? Just a big blue Q icon? Add mime types to your server (assumes Apache). You can do it in an .htaccess to make it easy.

Contrary to expectations, the following will not work.
AddType video/quicktime .mp4

Use this instead:
AddType video/mp4 .mp4

Of course.