[Libav-user] Good libavfilter tutorial

[wm4]

On Fri, 7 Mar 2014 09:15:12 -0800
Ricky Huang <rhuang.work at gmail.com> wrote:

> Hello all,
> 
> I am new to libavfilter and I am currently learning how to develop my own filter for frame analysis.  I am using this tutorial/guide, http://wiki.multimedia.cx/index.php?title=FFmpeg_filter_HOWTO, and it feels outdated being modified last on July 2010.  The example it uses, vf_negatem, does not exist any more.  Also the libavfilter documentation packaged in the ffmpeg source only describes what they are, now how to write one.
> 
> Any pointers would be appreciated.   Thanks.
> 

Extract the code from ffplay.c or ffmpeg_filter.c.