[Cin] Tracking (or tracer?) control points

Rafa Mar Multimedia en Gnu\Linux rafamar.mm.ig at gmail.com
Thu May 21 00:44:46 CEST 2020

Sorry Sam, I didn't quite understand that you were referring to a new tool
like the one you describe. Something like that would be wonderful at
Cinelerra. In fact I have always missed the rotation in the camera
assistant, but well this is another story.

Perhaps what could be done is something that I think would be simple, and
it is to unify some effects into one, to have a transformation effect where
position, scale, rotation and perspective can be manipulated from a single

And let me ask you a question, can python be used to make effects in

Greetings and forgive the misunderstanding.

El mié., 20 may. 2020 a las 21:55, Sam (<cinelerra at posteo.de>) escribió:

> What I meant is an advanced mask tool which moves the mask and optionally
> (rotation, perspective, scaling) the underlying image along with it then
> you have what you call pixel tracking. With this tool you can achieve
> fanatical effects, like color correction applied only on a mask and only on
> an object. Even though the object is moving, you can do a color correction
> and make the background in a completely different color, and on top of that
> another layer. I would have liked to have this tool when I made the short
> video for Cinelerra. That's why I don't think we should program these two
> things like mask tracking and pixel tracking completely separate from each
> other. I think we could do that in one tool.
> Am 20.05.20 um 20:18 schrieb Rafa Mar Multimedia en Gnu\Linux:
> With all my respects Sam, but the mask tool is not the right one in this
> case. The skins tool is used to cut, but not to deform a video clip or
> image.
> The ideal complement to a pixel tracking tool is perspective.
> I do not know programming, but perspective has four points very defined by
> coordinates. Perhaps you could keep track of the four corner points on the
> screen and then assign the coordinates of each of these 4 points to the
> perspective points.
> The mask could be used to make rounded corners of the video clip you have
> on the screen, or to trim a finger on top of it.
> Normally these works are done frame by frame, it is the way that
> guarantees a perfect finish.
> --
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> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
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