[Kdenlive-devel] REVERSE MOTION

Gabriel Gazzán gabcorreo at gmail.com
Fri Sep 16 18:36:32 UTC 2011

just as a reference, Premiere also uses a negative flag to invert Speed of a
perhaps they've faced similar issues... :)


2011/9/16 Dan Dennedy <dan at dennedy.org>

> On Fri, Sep 16, 2011 at 3:27 AM, Marco Ciampa <ciampix at libero.it> wrote:
> > On Thu, Sep 15, 2011 at 02:41:41PM +0200, Elbground Multimedia wrote:
> >> Hi Dan & other developers,
> >>
> >> Still a layman and ignorant of anything beyond using the User
> >> Interface, one question:
> >> If it already is integrated in the speed effect, why can't it simply
> >> be applied by entering a negative speed percentage (i.e. -100 for 1:1
> >> reverse motion) in the speed effect parameters? That, to me, seems the
> >> easiest and most conventional (i.e. similar to other applications such
> >> as Final Cut) way to solve the issue.
> >>
> >> Kind regards, Ingar
> >
> > naaaaahhhh too simple! ;-)
> Heh. It is only simple to make the UI widget permit negative numbers. :-)
> My first kdenlive patch submission a long time ago used negative
> speed. The problem is that the speed is used to calculate an effective
> duration throughout many places of the Kdenlive code. Therefore, with
> negative speed, you get a lot of places with negative duration! My
> patch addressed most of those by using the speed's absolute value, of
> course. But there were some unaddressed corner cases making the patch
> incomplete, and I was busy with MLT.
> Now, another way is to convert negative to a reverse flag, which MLT
> also accepts. I recently looked into that, and there are several
> places in Kdenlive code that need to be touched to carry and handle
> the reverse flag. Alas, I remain busy with MLT and not being that
> fluent with the kdenlive code and being this close to release, I did
> not want to introduce  that change at this time.
> --
> +-DRD-+
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