[FFmpeg-devel] Guidance needed for a semi-breaking change

[Timo Rothenpieler]

You need to keep API and ABI compatibility, cause otherwise it's a 
breaking change which can only happen at a major bump.
Any and all existing applications and commandline need to keep working 
as they do right now.

What you could do is convert the option into a OPT_TYPE_CONST one, and 
offer the new values as actual textual option, and set up the numerical 
values so that they align with what's currently offered.