avfilter: add deflicker filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -2,6 +2,7 @@ Entries are sorted chronologically from oldest to youngest within each release,
 releases are sorted from youngest to oldest.
 
 version <next>:
+- deflicker video filter
 
 version 3.3:
 - CrystalHD decoder moved to new decode API

doc/filters.texi

@@ -6253,6 +6253,44 @@ Limit the maximum change for each plane, default is 65535.
 If 0, plane will remain unchanged.
 @end table
 
+@section deflicker
+
+Remove temporal frame luminance variations.
+
+It accepts the following options:
+
+@table @option
+@item size, s
+Set moving-average filter size. Default is 5. Allowed range is 2 - 129.
+
+@item mode, m
+Set averaging mode to smooth temporal luminance variations.
+
+Available values are:
+@table @samp
+@item am
+Arithmetic mean
+
+@item gm
+Geometric mean
+
+@item hm
+Harmonic mean
+
+@item qm
+Quadratic mean
+
+@item cm
+Cubic mean
+
+@item pm
+Power mean
+
+@item median
+Median
+@end table
+@end table
+
 @section dejudder
 
 Remove judder produced by partially interlaced telecined content.

libavfilter/Makefile

@@ -155,6 +155,7 @@ OBJS-$(CONFIG_DCTDNOIZ_FILTER)               += vf_dctdnoiz.o
 OBJS-$(CONFIG_DEBAND_FILTER)                 += vf_deband.o
 OBJS-$(CONFIG_DECIMATE_FILTER)               += vf_decimate.o
 OBJS-$(CONFIG_DEFLATE_FILTER)                += vf_neighbor.o
+OBJS-$(CONFIG_DEFLICKER_FILTER)              += vf_deflicker.o
 OBJS-$(CONFIG_DEINTERLACE_QSV_FILTER)        += vf_deinterlace_qsv.o
 OBJS-$(CONFIG_DEINTERLACE_VAAPI_FILTER)      += vf_deinterlace_vaapi.o
 OBJS-$(CONFIG_DEJUDDER_FILTER)               += vf_dejudder.o

libavfilter/allfilters.c

@@ -166,6 +166,7 @@ static void register_all(void)
     REGISTER_FILTER(DEBAND,         deband,         vf);
     REGISTER_FILTER(DECIMATE,       decimate,       vf);
     REGISTER_FILTER(DEFLATE,        deflate,        vf);
+    REGISTER_FILTER(DEFLICKER,      deflicker,      vf);
     REGISTER_FILTER(DEINTERLACE_QSV,deinterlace_qsv,vf);
     REGISTER_FILTER(DEINTERLACE_VAAPI, deinterlace_vaapi, vf);
     REGISTER_FILTER(DEJUDDER,       dejudder,       vf);

libavfilter/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  84
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR  85
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \