avfilter/paletteuse: add diff_mode

doc/filters.texi

@@ -7026,6 +7026,21 @@ visible pattern for less banding, and higher value means less visible pattern
 at the cost of more banding.
 
 The option must be an integer value in the range [0,5]. Default is @var{2}.
+
+@item diff_mode
+If set, define the zone to process
+
+@table @samp
+@item rectangle
+Only the changing rectangle will be reprocessed. This is similar to GIF
+cropping/offsetting compression mechanism. This option can be useful for speed
+if only a part of the image is changing, and has use cases such as limiting the
+scope of the error diffusal @option{dither} to the rectangle that bounds the
+moving scene (it leads to more deterministic output if the scene doesn't change
+much, and as a result less moving noise and better GIF compression).
+@end table
+
+Default is @var{none}.
 @end table
 
 @subsection Examples

libavfilter/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  5
 #define LIBAVFILTER_VERSION_MINOR  11
-#define LIBAVFILTER_VERSION_MICRO 100
+#define LIBAVFILTER_VERSION_MICRO 101
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \