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add timer effect

Guillaume Papin requested to merge sarcasm/kdenlive:feat.timer-effect into master

Hello,

This MR is an attempt to add the "Timer" MTL effect.

I needed it to showcase some performance improvements of a software I maintain. I edited a video where I could show a before/after comparison with timer showing up the improvements.

To give an idea, something along these lines:

compare-sleep

I have seen some interest for this in Kdenlive on the web:

I'm not sure I implemented the "Start", "Duration" and "Offset" parameters properly, especially the "totime" attribute.

I did not implement the "Speed" parameter because I didn't needed it yet and because I'm not sure it should affect the "totime" attributes (which may hint that this isn't the right direction).

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