@@ -1925,6 +1925,13 @@ luminance value greater than the minimum allowed value.

 The parameters describing the bounding box are printed on the filter

 log.

+The filter accepts the following option:

+

+@table @option

+@item min_val

+Set the minimal luminance value. Default is @code{16}.

+@end table

+

 @section blackdetect

 Detect video intervals that are (almost) completely black. Can be

@@ -31,7 +31,7 @@

 #define LIBAVFILTER_VERSION_MAJOR  3

 #define LIBAVFILTER_VERSION_MINOR  70

-#define LIBAVFILTER_VERSION_MICRO 100

+#define LIBAVFILTER_VERSION_MICRO 101

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

@@ -23,6 +23,7 @@

  * bounding box detection filter

  */

+#include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/timestamp.h"

 #include "avfilter.h"

@@ -30,9 +31,20 @@

 #include "internal.h"

 typedef struct {

-    int unused;

+    const AVClass *class;

+    int min_val;

 } BBoxContext;

+#define OFFSET(x) offsetof(BBoxContext, x)

+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

+

+static const AVOption bbox_options[] = {

+    { "min_val", "set minimum luminance value for bounding box", OFFSET(min_val), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 254, FLAGS },

+    { NULL }

+};

+

+AVFILTER_DEFINE_CLASS(bbox);

+

 static int query_formats(AVFilterContext *ctx)

 {

     static const enum AVPixelFormat pix_fmts[] = {

@@ -58,7 +70,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

     has_bbox =

         ff_calculate_bounding_box(&box,

                                   frame->data[0], frame->linesize[0],

-                                  inlink->w, inlink->h, 16);

+                                  inlink->w, inlink->h, bbox->min_val);

     w = box.x2 - box.x1 + 1;

     h = box.y2 - box.y1 + 1;

@@ -100,6 +112,7 @@ AVFilter avfilter_vf_bbox = {

     .name          = "bbox",

     .description   = NULL_IF_CONFIG_SMALL("Compute bounding box for each frame."),

     .priv_size     = sizeof(BBoxContext),

+    .priv_class    = &bbox_class,

     .query_formats = query_formats,

     .inputs        = bbox_inputs,

     .outputs       = bbox_outputs,