[FFmpeg-devel] Possible new feature: moving zoom

Jean-Michel Pouré jmpoure
Sat Jul 11 23:01:31 CEST 2009

This is kind of camera (for movie) or Ken Burns effect (photos). 

The right place to add this feature is MLT (command line video engine)
with Kdenlive (GUI). MLT is based on FFmpeg and is more the place to add
your feature.

To describe and discuss your project, you can connect here:

We will help you implement the feature in MLT. Dan Dennedy has a project
to implement the Ken Burns effect. I don't know the advancement of code.
We can discuss that on Kdenlive forum.

Kind regards,
Jean-Michel Pour?

Le samedi 11 juillet 2009 ? 22:48 +0200, Stefano Sabatini a ?crit :
> > I am planning to implement a feature I need in ffmpeg.c. We have
> several  
> > recordings of theatre performances in high resolution video made
> with a  
> > camcorder on a fixed stand. I would like to add a virtual
> hand-held  
> > effect, that is: zoom in on the active character, follow him about
> the  
> > stage, zoom out again, that sort of thing.
> >
> > I would create a configuration file which states, for every frame of
> the  
> > film, the rectangle I want zooming to full size. The better the
> config,  
> > the better the result. For instance, if the rectangle corners
> follow  
> > spline curves, the zooming will look smooth. As if filmed by a good 
> > camera man.
> >
> > Is anybody but me interested in this feature? It would consist of
> a  
> > command-line option like "-zoomconfig <filename>" and some
> additional  
> > clipping and rescaling in ffmpeg.c:do_video_out().

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