[kdenlive] [Bug 364891] title clip rendering is broken in mlt-6.2

[Nikita Melnichenko via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364891

Nikita Melnichenko  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |LATER

--- Comment #5 from Nikita Melnichenko  ---
Closed. Thanks for the articles!

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[kdenlive] [Bug 364891] title clip rendering is broken in mlt-6.2

[Wegwerf via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364891

Wegwerf  changed:

   What|Removed |Added

 CC||wegwerf-1-...@gmx.de

--- Comment #4 from Wegwerf  ---
Nikita, can you please be so kind as to close this bug if the answer works for
you? Thank you very much for you cooperation!

If you like to see what's upcoming, that is, the improved easy of use
Jean-Baptiste is talking about:
*
http://thediveo-e.blogspot.de/2016/07/new-kdenlive-transition-composite-and.html
* http://thediveo-e.blogspot.de/2016/07/kdenlive-easy-compositing-with.html

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[kdenlive] [Bug 364891] title clip rendering is broken in mlt-6.2

[Jean-Baptiste Mardelle via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364891

--- Comment #3 from Jean-Baptiste Mardelle  ---
Yes, this is currently fixed using MLT and Kdenlive from git master, should be
available with Kdenlive 16.08 and MLT 6.4.0.

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[kdenlive] [Bug 364891] title clip rendering is broken in mlt-6.2

[Nikita Melnichenko via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364891

--- Comment #2 from Nikita Melnichenko  ---
This workaround works well, thank you!

Looking forward to better transparency handling! I wonder if it's possible to
make transparency as intuitive as in GIMP layers...

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[kdenlive] [Bug 364891] title clip rendering is broken in mlt-6.2

[Jean-Baptiste Mardelle via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=364891

--- Comment #1 from Jean-Baptiste Mardelle  ---
Sorry for the delay. This is in fact not really a bug but a problem in the way
Kdenlive (and MLT) handles alpha transparency and transitions. Title clips use
antialiasing to provide smooth edges.

However, currently to be displayed correctly in Kdenlive / MLT, an image with
alpha transparency must have a transition attached to it. In your project, the
title has a composite transition, which is correct.

Now the problem here is that transitions in Kdenlive cannot be applied on an
empty track. In your project, you have the title clip on top track, and the
transition is applied with the track below, which is empty - reason why it does
not work.

So to solve your problem, you must either:
* put a clip on the track below your title
* change the transition parameters (the track parameter) to apply transition on
the background black track (in the "track" combobox, select "black"). this will
make the transition work and text will look fine.

I am well aware that this behavior is confusing and problematic and have been
working on a solution to make transparency correctly handled by default. I hope
to introduce that for the 16.08 release in august.

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