[kdenlive] Track compositing changes

[Jesse DuBord]

I've confirmed that this enhancement smoothens playback completely when 
working with multiple clips, .png's, title clips, and others overlapping 
each other on different tracks in the timeline.

There has been a bug I'd reported on this a while back (see bug 
https://bugs.kde.org/show_bug.cgi?id=361360). Before I close it, can 
anyone else who uses the git master build (whether on Arch or through 
the ppa for Ubuntu) confirm that this new change works: that you don't 
experience any lag in playback when clips are overlapping each other in 
the timeline?

Thanks.

On 07/19/2016 05:00 AM, kdenlive-request at kde.org wrote:

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> Today's Topics:
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>     1.  Track compositing changes (Jean-Baptiste Mardelle)
>     2.  Three Cheers to the automatic project backup...!
>        (Harald Albrecht)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 19 Jul 2016 00:17:55 +0200
> From: Jean-Baptiste Mardelle <jb at kdenlive.org>
> To: kdenlive <kdenlive at kde.org>
> Subject: [kdenlive] Track compositing changes
> Message-ID: <aeb1fa8a-ebbb-4506-b88f-14c612acc109 at kdenlive.org>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hi everyone,
>
> I just commited a change to MLT and Kdenlive that enable a new transition
> and a new effect for compositing and transform.
>
> I know it is a bit late to introduce such change so close to the 16.08
> release but it should fix a major slowdown issue we were experiencing since
> the introduction of the track compositing feature (1). This should also
> enable us (with another pending patch) to fix the titles being pixelated in
> some situations (2).
>
> This change replaces the frei0r.cairoblend transition that was used to
> create transparency between tracks with a new transition called qtblend.
> This is currently only enabled on newly created projects, when you have the
> latest MLT git master.
>
> This new transition should bring a great speed improvement in situations
> where several non transparent clips were stacked on different tracks.
>
> The new qtblend filter, called "Transform" in effect stack brings the same
> features as the affine (position and zooom) filter, but has a better
> handling of alpha transparency and supports the recent animated keyframe
> feature allowing curved moves.
>
> Feedback and testing is welcome.
> For *ubuntu users, our git master PPA (if you want to take the risk) should
> be updated in a few hours with the changes.
>
> Regards,
>
> jb
>
> (1) https://bugs.kde.org/show_bug.cgi?id=361360
> (2) https://bugs.kde.org/show_bug.cgi?id=364891
> (3) https://launchpad.net/~kdenlive/+archive/ubuntu/kdenlive-master
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 19 Jul 2016 12:20:49 +0200
> From: Harald Albrecht <harald.albrecht at gmx.net>
> To: Kdenlive <kdenlive at kde.org>
> Subject: [kdenlive] Three Cheers to the automatic project backup...!
> Message-ID: <578DFF01.7030708 at gmx.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hi,
>
> the automatic project backup just saved me of having reconstruct more
> than half an hour worth of work, due to another ugly git master timeline
> spacer tool bug.
>
> The spacer tool still behaves unreliable, totally destroying projects
> but you notice only on project reload! A sign of the malfunction is that
> when you move a complex set of clips and transitions, suddenly the whole
> group jumps around instead of moving correctly with the mouse, sometimes
> sticking to some place. However, everything looks fine until you save
> and reload: a lot of clip and transition copies, some clips and
> transitions lost, or maybe hidden beneath others.
>
> The upside is, backups were to my rescue. So thanks for them!
>
> Best regards,
> Harald
>
>
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> End of kdenlive Digest, Vol 21, Issue 8
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