How to set the mode (additive, substractive..) for the mask  

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Hi all,

I am trying to apply a mask to my video, to fade out the edges of the video.
Using the mask feature found in the compositor window, if I understand the documentation correctly the mask settings dialog (popping up after clicking the question mark button in the compositor window) should have a button, or drop down, for setting the "mode" and the  "value" for the mask. Though these settings seem absent. Without that setting I can not fade out the edges of the video (Or am I totally of track here?)

I am using Cinerella-gg [cin_5.1.ub18.04-20190731_amd64.deb] on ubuntu-19.04 (Disco)
(I had the same issue with the previous version [cin_5.1.ub18.04-20190630_amd64.deb])

Hope someone can help me out on this one.

Thanks!

4 Answers
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In the last year the mask tool has evolved a lot. In cinelerraGG_Manual you can still find the old version, no longer valid. Waiting for the update there is a pdf dedicated to the new mask tool:
https://www.cinelerra-gg.org/download/Mask_changes.pdf

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You can just use the slider bar in the "Fade and Feather" section that is to the right of the word "Fade".  Additive, subtractive is now just positive direction or negative direction with 0 being the middle point on the slider bar.  For now it goes to either -100 or +100 but a newer version is being worked to allow for going greater/lesser than 100. Please reply if there is still some confusion.

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Thanks for the hints, and the link for the new documentation.

After more trying I figured out that the mask function only works at places on the timeline where at least two video tracks contain a clip.
Not sure if the mask function was meant like that. In my case, where I want to fade to black on the edges of the video, I require a clip that is totally black.

Anyway I now have a way to get done what I want to do 🙂

Thanks!

 

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If I understand correctly, you want to do a vignette. You can use the Gradient filter (manual 10.8, page 217) or the F_vignette filter from ffmpeg. Warning: ffmpeg filters don't have a GUI and their use could be boring.
As for the mask you're right, you often need another track below (even a copy of the first track can be useful). The Cinelerra Mask tool is very powerful, but to make a real rotoscoping you need compositing programs, such as Natron for example.

@andreapaz

Thanks for the extra options. I have taken a look at the gradient, and it could have been a solution :). though I prefer the free form of the mask in this case. I also took a short look at the f_vignette filter, but I could not get it to do anything, so I gave up on that option.

Greetings!

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