[FFmpeg-devel] Possible new feature: moving zoom

[Mark Roberts]

Hi,

Mark Roberts:
>> I am planning to implement a feature I need in ffmpeg.c.

Stefano Sabatini:
> ffmpeg.c is not the right place for that, have a look at
> libavfilter. Note that a good amount of work is needed to get
> libavfilter merged into the main trunk, help in that area is very
> welcome.

I am trying hard not to ask any silly questions. I have read the webpage, 
the code, and the doc/ directory. I am still helpless:

I cannot find an introduction to using libavfilter. The doxygen docs are 
readable, but a working example or introduction could be useful as well.

I don't see where libavfilter is used within ffmpeg. What am I 
overlooking? Also I notice that within ffmpeg.c cropping (with -topcrop 
etc.), padding (with -padtop etc.) and scaling (with -s) are coded 
directly. I would have expected libavfilter to be used there, if it were 
available and working.

Thanks for any clarifications.
Mark