Adjust the default start_frame() and end_frame() implementations to simplify

the implementation of simple filters.

Commited in SoC by Bobby Bingham on 2007-07-08 16:48:15

Originally committed as revision 12082 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/avfilter.h

@@ -196,6 +196,7 @@ struct AVFilterLink
     enum PixelFormat format;
 
     AVFilterPicRef *cur_pic;
+    AVFilterPicRef *outpic;
 };
 
 /** Link two filters together */