[Cin] How do I crop a picture-in-picture?

[Rafa Mar Multimedia en Gnu\Linux]

David watch this video, maybe it will help you
https://streamable.com/3gkrtf

El vie., 17 abr. 2020 a las 5:03, Rafa Mar Multimedia en Gnu\Linux (<
rafamar.mm.ig at gmail.com>) escribió:

> I think what he wants to do, what will really be good for him is to wear a
> mask. F3 in the composer.
>
> Another option is to edit this video that you want to put on top, with the
> measurements you want 1:1, export it like this, and then insert it into
> this project.
>
> El vie., 17 abr. 2020 a las 1:18, Phyllis Smith (<phylsmith2017 at gmail.com>)
> escribió:
>
>> Have you tried the "Crop & Position" plugin instead of the "Crop tool" in
>> the Compositor?  IgorBeg is the expert on usage.
>>
>> On Thu, Apr 16, 2020 at 4:43 PM David Given <dg at cowlark.com> wrote:
>>
>>> I have two video tracks; one is overlayed on the other. I'm using
>>> projector automation to put the overlay video in the corner of the
>>> underlying video. I would like to crop the overlay video so it only shows
>>> the section I'm interested in. The overlayed video is a 1:1 image in the
>>> middle of a 16:9 video, and I just want to show the 1:1 bit. I can't figure
>>> out how to do this.
>>>
>>> - I thought I would be able to use the camera automation to scale the
>>> image after I had placed the projector, but while this works, it happens
>>> *before* any track plugins are rendered, and as one of these is
>>> rotation I always end up with a rotated rectangle on the screen. (With
>>> black borders.)
>>> - using the crop plugin adds more black borders.
>>> - I tried a mask, but I haven't found out how to invert the mask (i.e. I
>>> draw the area I want displayed so that everything else is cropped); plus
>>> cropped areas show up as black.
>>> - I simply can't get my head around the crop tool.
>>>
>>> The best I've come up with is to add a scale plugin to the track to
>>> resize it up a bit, so that the black wedges caused by the rotate plugin
>>> aren't visible; then adjusting the camera to zoom in on the are I'm
>>> interested in; but I haven't found a way to change the *shape* of the
>>> projector yet. It's always a 16:9 rectangle, but the area I want to show
>>> isn't that shape.
>>>
>>> What's the right way to do this? Ideally what I would like is the
>>> ability to draw a path on an object on the screen and say 'clip this object
>>> to this path'. Does anything like that exist?
>>>
>>> --
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