This occurs in case of large buffer underflow, such as if stopping the
VLC process.

Cork state could change asynchronously without the PA lock.

(Maybe the option should be renamed also)

in empty directory

Input picture to a filter is never NULL. And even if it were NULL, the
pointer is dereferenced earlier...

This provides broader details for luma and chroma (0-255 instead of 16-235 and respectively 1-255 instead of 16-240)

and use limits to render underline/strikethrough correctly