overall filter/mask

[John Pale]

FCP does not use filler. For the most part, it makes things easier. You have to think a little differently.

Nest the entire sequence and apply the widescreen filter to the nest.

Duplicate the sequence first to retain an “un-nsested” version of the sequence, if you like.

[Nick Meyers]

if it;s a WS mask in particular you want,
i prefer to create on in Photoshop, and place that on a tack above the other clips.
makes it easier to re-frame the shots, if needed.

2 lengths of slug, cropped of moved in to place, will do the same,
but it;s not as neat looking 🙂

cheers,
nick

[Bouncing Account needs new email address]

[NIckM] “2 lengths of slug, cropped of moved in to place, will do the same,
but it;s not as neat looking 🙂
“

Or place a slug clip in the video track above and add Video Filter > Matte > Mask Shape, adjusted to the size you want.

[Oliver Busch]

In FCP this works only for so-called ‘generators’. These generators create a separate video track which can be placed above all other video layers, whereas Apple’s ‘Widescreen Mask’ >filter< can only be applied to individual clips. (Realtime) mask generators are contrained in 'Joe's Filters 3.5' or 'Eureka Plugins v5' for instance. Both are commercial packages ($99 and $49). At least there are demo versions so you can try and decide if the functionality you want is worth the price (the mask generator is only a part of the functionality of both plugins sets - they offer many other effects, too) https://www.joesfilters.com/
https://www.kafwang.com/eureka/eurekamain.html

Hope this helps, Oliver

[Carlo G]

Thanks everyone for your input. You’ve given me several options.