<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello all,<div><br></div><div>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, <a href="http://wiki.multimedia.cx/index.php?title=FFmpeg_filter_HOWTO">http://wiki.multimedia.cx/index.php?title=FFmpeg_filter_HOWTO</a>, and it feels outdated being modified last on July 2010.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.</div><div><br></div><div>Any pointers would be appreciated. Thanks.<br>
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