support for pre-configured fourcc codes

[niall-us]

Is your feature request related to a problem? Please describe.

Not a problem, but a feature request. I've found YUView capable of showing pretty much any common 420 or 422 format. But, it requires some twiddling with 'custom' to get this to work.

Describe the solution you'd like
Have a fourcc code pull-down that pre-configures the format as needed.

Describe alternatives you've considered
Could also be extracted from the file name.