Index: avfilter.h
===================================================================
--- avfilter.h	(revision 22749)
+++ avfilter.h	(working copy)
@@ -62,6 +62,14 @@
 /* TODO: look for other flags which may be useful in this structure (interlace
  * flags, etc)
  */
+
+#define AV_PIX_IMGFIELD_ORDERED 0x01
+#define AV_PIX_IMGFIELD_TOP_FIRST 0x02
+#define AV_PIX_IMGFIELD_REPEAT_FIRST 0x04
+#define AV_PIX_IMGFIELD_TOP 0x08
+#define AV_PIX_IMGFIELD_BOTTOM 0x10
+#define AV_PIX_IMGFIELD_INTERLACED 0x20
+
 /**
  * A reference-counted picture data type used by the filter system. Filters
  * should not store pointers to this structure directly, but instead use the
@@ -86,6 +94,7 @@
     void (*free)(struct AVFilterPic *pic);
 
     int w, h;                  ///< width and height of the allocated buffer
+    int fields;                ///< field ordering
 } AVFilterPic;
 
 /**
@@ -103,6 +112,7 @@
     int linesize[4];            ///< number of bytes per line
     int w;                      ///< image width
     int h;                      ///< image height
+    int fields;                ///< field ordering
 
     int64_t pts;                ///< presentation timestamp in units of 1/AV_TIME_BASE
     int64_t pos;                ///< byte position in stream, -1 if unknown