[kdenlive] Track compositing changes

Jesse DuBord jesse.dubord at gmail.com
Tue Jul 19 17:46:47 UTC 2016


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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