avfilter/vidstabtransform: update optzoom range values for recent vid.stab update.

Signed-off-by: Georg Martius <martius@mis.mpg.de>

doc/filters.texi

@@ -7853,8 +7853,15 @@ percentage to zoom (default: 0)
 @end table
 
 @item optzoom
-if 1 then optimal zoom value is determined (default).
-Optimal zoom means no (or only little) border should be visible.
+set optimal zooming to avoid borders
+@table @samp
+@item 0
+disabled
+@item 1
+optimal static zoom value is determined (only very strong movements will lead to visible borders) (default)
+@item 2
+optimal adaptive zoom value is determined (no borders will be visible)
+@end table
 Note that the value given at zoom is added to the one calculated
 here.
 

libavfilter/vf_vidstabtransform.c

@@ -67,7 +67,7 @@ static const AVOption vidstabtransform_options[] = {
     {"zoom",      "percentage to zoom >0: zoom in, <0 zoom out",                    OFFSETC(zoom),
                    AV_OPT_TYPE_DOUBLE, {.dbl = 0},     -100, 100,  FLAGS},
     {"optzoom",   "0: nothing, 1: determine optimal zoom (added to 'zoom')",        OFFSETC(optZoom),
-                   AV_OPT_TYPE_INT,    {.i64 = 1},        0, 1,    FLAGS},
+                   AV_OPT_TYPE_INT,    {.i64 = 1},        0, 2,    FLAGS},
     {"interpol",  "type of interpolation",                                          OFFSETC(interpolType),
                    AV_OPT_TYPE_INT,    {.i64 = 2},        0, 3,    FLAGS, "interpol"},
     {  "no",      "no interpolation",                                               0,