Many thanks Dan and Brian. I ended up installing Ubuntu and Kdenlive to play 
with the effects as suggested.

All the best

Geoffroy

Le 3 janv. 2014 à 00:31, Brian Matherly <pez4br...@yahoo.com> a écrit :

>> I'm quite new to MELT and using it with MLT XML only.
> 
>> Looking at the demos (mlt_slideshow2), the "affine" filter seems very
>> powerful, but it's not documented on the website.
>> Is there any mean I can guess undocumented parameters ?
>> Or should I put an issue on github to ask for documentation ?
> 
> A great way to learn is to open kdenlive and apply the "Rotate and Shear" 
> effect. This effect uses the affine filter under the hood. See how the filter 
> alters a clip in kdenlive. Then, save the kdenlive project and look at it in 
> a text editor. The kdenlive text editor is simply an MLT xml file.
> 
> Patches for documentation improvements are always welcome.
> 
> ~Brian
> 

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