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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0001485||Kdenlive||Transitions||public||2010-03-07 08:23||2012-09-26 02:23|
|Platform||32 bit intel||OS||openSuse||OS Version||11.3|
|Target Version||Fixed in Version|
|Summary||0001485: Image Alpha Transparency does not work as expected|
|Description||Image Alpha Transparency does not work as expected|
Track 1 - png or svg image with alpha transparency
Track 2 - nothing
Track 3 - clip (video or image)
Image on track 1 has to have a composite transition to display its alpha transparency. This is wrong wrong wrong. Kdenlive should natively use the alpha transparency of the image.
And apply that over all of the clips below it, not just the immediate clip below.
In the above track description, the alpha transparency does not work because there is no clip in the track immediately below.
Alpha transparency should be applied to all tracks just as in any standard graphical program such as Gimp, Photoshop, Inkscape does with layers, allowing all layers below to show through.
This makes persistent titling (a title that spans many clips) extremely painful to implement and just plain impractical.
At the moment, I will have to resort to rendering the whole clip and then creating a new project to apply the title over the whole of the clip.
|Steps To Reproduce||Track 1 - png or svg image with alpha transparency|
Track 2 - nothing
Track 3 - clip (video or image)
|Tags||No tags attached.|
|Build/Install Method||Distribution package|
To apply the composite transition to a track other than the one below you have to choose a track for the transition to apply on (can be found in the upper right corner of the transition tab).
But for sure it is not ideal that way.
The composite transition is really just an ugly hack. Having a simple option to activate it(maybe directly in the clip's right click menu) would make life so much easier.
This would simply take into account the alpha channel (from pictures and videos) and apply the compositing to all tracks.
Combine that with clip positionning (perhaps simply a keyframable "position" effect) and you would get quite nice compositing possibilities.
I've started to look into the Kdenlive code, but this is a really advanced feature and I doubt I'll get anywhere anytime soon.
To my mind this is maybe THE most important new feature Kdenlive could get. (Well that and having audio fade-out and volume effect work together...)
ttil, that is not a viable option. I have a title with alpha transparency the I want to float above multiple clips as the time line progresses, so applying the alpha to just one track will not serfice.
I agree with LeHomard, it is one of THE most important features Kdenlive shoud get.
Until then, I'm going to have to render the whole project, then create a new one with the rendered clip and overlay my titles there.
Actually, I've discovered I can import other kdenlive project files into the current one. This allows me to composite the layering of alpha transparencies I want. Which proves it is not a deficiency in MLT but Kdenlive.
Its a work around that has give me a new interesting workflow. what would be also great to see now, is the ability to expand, collapse or edit these imported projects.
I need to add something to this that is a HUGE problem for me.
Currently anything with alpha transparency is not 100% transparent. It leaves a kinda "green" color that is extremely visible on light backgrounds to it. I do an intro outro to some vidoes with multiple tracks of PNG files (I've tried the same with SVG but the problem persists!), with the multiple composites the green is much much more pronounced. I was using OpenShot to generate these before, but OpenShot is currently in a state of complete uselessness at the moment if you try to run it in a system with the latest kdenlive & mlt libraries installed, and up until recently it didn't display this. Now it seems to do the same thing - which leads me to believe this might be something going on in MLT, but you guys will have to tell me.
I'm happy using composites, but having this GREEN layer is a dealbreaker and I don't have an alternative in which to animate these intros/outros at the moment, and frankly it should just work here without adding that nasty green.
|2010-03-07 08:23||neoarttec||New Issue|
|2010-03-07 09:56||ttill||Note Added: 0004791|
|2010-03-08 10:57||LeHomard||Note Added: 0004796|
|2010-03-10 03:57||neoarttec||Note Added: 0004801|
|2010-05-01 08:44||ddennedy||Relationship added||duplicate of 0001500|
|2010-05-01 08:49||ddennedy||Relationship added||has duplicate 0001456|
|2010-05-02 09:47||neoarttec||Note Added: 0005099|
|2010-07-29 20:17||Granjow||Relationship added||related to 0001713|
|2012-09-26 02:23||jpsantos||Note Added: 0008397|
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