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Track matte key. Am I doing something wrong?

Explorer ,
Jun 18, 2013 Jun 18, 2013

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Hello everyone. I'd appreciate it if you could help me on the following: On a Premiere sequence, I have 3 video tracks. Tracks Video 1 and Video 2 contain 2 separate clips and track Video 3 contains a jpg static video matte (black and white). What I need to do is I want to use the jpg image as matte, so all I do is place the three assets on top of each other and then apply a track matte to Video 2, set its matte to Video 3, set compositing to luma and bingo! My 2 videos on track 1 and 2 are now playing with the mask I set to them.

Now say I want to scale up in my clip in video track 2, so that I focus on a different part of it, but with the mask applied and not changed at all. What I found out is that no matter whether I scale the clip before or after I apply the track matte key, the result is applied on both the mask AND the clip. Why does this happen? Is it a version bug or do I get something wrong? Shouldn't the clip scale be able to get carried out independently of the applied track matte? And why is this procedure carried out as it should be on After Effects but not in Premiere?

To get a better idea of what I mean, I uploaded a video on YouTube, regarding the issue. As you'll see, to get the exact matte size from one clip change to another, i had to split the mask jpg using the razor and then apply a different scale on it. What would be the case if I had, say, 20 different tracks?

The clip is located here http://youtu.be/da52U9ZfLAw

Thanks in advance

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correct answers 1 Correct answer

People's Champ , Jun 18, 2013 Jun 18, 2013

Motion and track mattes do not mix. You need to do the motion in a nested sequence.

Take the track matte and the video that you are applying motion to into a new sequence. Set the matte on top and set the opacity to 50%. Use motion on the video just the way you want it. Then poke out the eyeball on the matte's track so you don't see it.

Now you can nest that sequence into the main sequence and apply the track matte to it instead of the original clip. Since Premiere Pro does not see the motion in

...

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People's Champ ,
Jun 18, 2013 Jun 18, 2013

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Motion and track mattes do not mix. You need to do the motion in a nested sequence.

Take the track matte and the video that you are applying motion to into a new sequence. Set the matte on top and set the opacity to 50%. Use motion on the video just the way you want it. Then poke out the eyeball on the matte's track so you don't see it.

Now you can nest that sequence into the main sequence and apply the track matte to it instead of the original clip. Since Premiere Pro does not see the motion in the main sequence (it is actually happening in the nested sequence) then it does not bother the track matte effect.

artofzootography.com

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New Here ,
Sep 15, 2015 Sep 15, 2015

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Steven, so helpful! Thank you! Was trying to track matte some video with motion applied, and it was driving me crazy! Nested the vid, and BOOM! Worked perfectly. Such a simple solution.

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People's Champ ,
Sep 15, 2015 Sep 15, 2015

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You are welcome Dave. It is always a pleasure to see people using the search function and getting the info they need. It makes posting in a forum seem like so much more of a valuable way to spend time.

artofzootography.com

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Guest
Jun 18, 2013 Jun 18, 2013

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I'd like to clarify a bit on this: you're facing two issues there:

- render order;

- bugs in the Track Matte Key effect.

Regard to the first one, all effects are rendered in a particular order:

- from top to bottom according to their position in a list of applied effects;

- Fixed effects are rendered after Standard effects;

- nested content is rendered in ascending bubble mode: from a greatest depth to a surface.

Therefore, so as to trick the render order you can e.g. instead of manipulating the Motion effect's properties apply the Transform effect prior to any other Standard effects or nest your footage and manipulate the Motion effect's properties inside the nested sequence.

Regard to the Track Matte Key bugs, you can't sometimes trick it with the Transform effect and, hence, as Steven said, have to nest.

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Explorer ,
Jun 19, 2013 Jun 19, 2013

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Thanks a lot for the replies, they're very helpful.

So it isn't actually my idea, there is actually a bug in the Track Matte key effect. Is it at least resolved in version CS6?

T.

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Guest
Jun 19, 2013 Jun 19, 2013

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Nope. Steven can check if the Track Matte Key bugs are fixed in PrPro CC. I'm currently in the middle of a large project and don't have time to test the CC.

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Explorer ,
Jun 19, 2013 Jun 19, 2013

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Thanks a lot.

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People's Champ ,
Jun 19, 2013 Jun 19, 2013

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Bug. Inconvenient implementation. Call it what you will.

Either way, we have lived with it for a while. So long, in fact, that I guess I don't even think about it any more. I just put tracks mattes on a different sequence out of habit anymore.

FYI, it works the same way in CC.

The reason I call it an inconvenient implementation is that I don't think Adobe considers it a bug.

artofzootography.com

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Guest
Jun 19, 2013 Jun 19, 2013

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When Adobe increases the hight of a transition, which causes difficulties in selecting an edit point, - it's the inconvenient implementation.

When an effect behaves in unpredictable way, not in the way it should even though all the logic, including render order, is respected, - it's a bug.

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People's Champ ,
Jun 19, 2013 Jun 19, 2013

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I agree, I just don't think Adobe agrees. Or they would have fixed it by now.

artofzootography.com

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Guest
Jun 19, 2013 Jun 19, 2013

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Not necessarily. They might simply decide not to spend any efforts (resources) on fixing a bug or put the fixing off - there is a load of examples, unfortunately.

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Contributor ,
Aug 14, 2013 Aug 14, 2013

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Hi, I tried my hand at working around this "inconvenience"; I just posted my solution to this problem in the Pr Elements forum without realizing where I was replying to. I don't know if this counts as a cross post, but anyway:

http://forums.adobe.com/message/4515416#4515416

Cheers

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People's Champ ,
Aug 14, 2013 Aug 14, 2013

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The order of effects is the actual issue.

If you use Transform instead of Motion I believe that you might be able to make it work in Premiere Pro.

artofzootography.com

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Contributor ,
Sep 14, 2013 Sep 14, 2013

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Hi Steve,

thanks, using Transform instead of the Motion effect works.

Cheers,

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New Here ,
Nov 30, 2022 Nov 30, 2022

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This tip worked like a charm.  Thank you.

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