Cta608Format type

CTA-608 format (note this may be embedded in 708 according to output container)

Aka CEA-608/EIA-608. Note restrictions on 608 captions - 31 characters per line, a low data rate of about 60 characters per second, in particular impacting any attempt to pop-on captions with revisions (eg adding word by word)

Signature:

export type Cta608Format = {
    kind: '608';
    style?: 'pop-on' | 'roll-up';
    lines?: number;
};