Apply rotations and flip in a single "if" statement

Sorry for the all the noise, and feel free to close without additional discussion.

In looking for the bug in #29101

I originally had trouble compiling from source on the 4.0 branch.

Eventually, i got it working and found that the 4.0 branch (master) actually has this fixed.

However, I do think the code is a bit convoluted.

In my mind:

1. Read the videos settings
2. Apply the correct transformations

Doesn't need an extra step of: 3. Now fixup the transformation if they are wrong.

If you do plan on closing this, I can look to backport the existing codepath in the 4.0 branch to !7113 (closed)

On master:

On this branch