just as a reference, Premiere also uses a negative flag to invert Speed of a clip.<br>perhaps they've faced similar issues... :)<br><br>g<br><br><br><div class="gmail_quote">2011/9/16 Dan Dennedy <span dir="ltr"><<a href="mailto:dan@dennedy.org">dan@dennedy.org</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">On Fri, Sep 16, 2011 at 3:27 AM, Marco Ciampa <<a href="mailto:ciampix@libero.it">ciampix@libero.it</a>> wrote:<br>
> On Thu, Sep 15, 2011 at 02:41:41PM +0200, Elbground Multimedia wrote:<br>
>> Hi Dan & other developers,<br>
>><br>
>> Still a layman and ignorant of anything beyond using the User<br>
>> Interface, one question:<br>
>> If it already is integrated in the speed effect, why can't it simply<br>
>> be applied by entering a negative speed percentage (i.e. -100 for 1:1<br>
>> reverse motion) in the speed effect parameters? That, to me, seems the<br>
>> easiest and most conventional (i.e. similar to other applications such<br>
>> as Final Cut) way to solve the issue.<br>
>><br>
>> Kind regards, Ingar<br>
><br>
> naaaaahhhh too simple! ;-)<br>
<br>
Heh. It is only simple to make the UI widget permit negative numbers. :-)<br>
<br>
My first kdenlive patch submission a long time ago used negative<br>
speed. The problem is that the speed is used to calculate an effective<br>
duration throughout many places of the Kdenlive code. Therefore, with<br>
negative speed, you get a lot of places with negative duration! My<br>
patch addressed most of those by using the speed's absolute value, of<br>
course. But there were some unaddressed corner cases making the patch<br>
incomplete, and I was busy with MLT.<br>
Now, another way is to convert negative to a reverse flag, which MLT<br>
also accepts. I recently looked into that, and there are several<br>
places in Kdenlive code that need to be touched to carry and handle<br>
the reverse flag. Alas, I remain busy with MLT and not being that<br>
fluent with the kdenlive code and being this close to release, I did<br>
not want to introduce that change at this time.<br>
<br>
--<br>
+-DRD-+<br>
<br>
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