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When animating a mask's opacity, you cannot find the keyframes in the dopesheet. Is in another place instead?

I've found this bug report but it's not clear if is there a solution or if it's even a bug.

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    $\begingroup$ That bug report is still open and it hasn't yet been fixed, which means it still needs to be looked at by a developer. I suggest creating an account on the developer.blender website and subscribing to the bug report so you will be notified when anyone new comments. $\endgroup$ – Ray Mairlot Jan 31 '17 at 17:12
  • $\begingroup$ I do have an account, thanks for the tip Ray I'll do that. $\endgroup$ – Antonio Buch Feb 1 '17 at 11:22
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While the bug is fixed (if it ever does), you can use a math node set to multiply to control the opacity of the mask. Animate the values from 1 (full opacity) to 0 (no opacity). Those keyframes will show up on the graph editor or the dopesheet.

enter image description here

Animating the values

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  • $\begingroup$ Thanks Cegaton, I already knew that. But it does not response my question :( The problem here is that I have a bunch of mask layers. In that case managing the opacity in composition is a mess. $\endgroup$ – Antonio Buch Feb 1 '17 at 11:15

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