Looking briefly at the .mov file format[1], it appears that any such file is guaranteed to have exactly the same bytes 4-11 (atom identifier and major brand identifier), is almost guaranteed to lead with three zero bytes (first four bytes are the length of the first atom, which is likely to be small), and will probably have the same bytes 12-15 (minor version number). If you know it's a .mov file, then you can extract "RAN" and "OM_STRIN" trivially, and the rest is easily guessable from there. In fact, since the first three bytes are probably zero, "RAN" will be right there in the file, ready for pondering.

[1] https://developer.apple.com/library/mac/#documentation/Quick...