lavfi/drawtext: give a new alias "timecode_rate" to the the r/rate option

The option is related to the timecode, the new name clearly specifies the
context. Also it allows to list the option close to the other timecode
options.

doc/filters.texi

@@ -1329,9 +1329,6 @@ Default value is "render".
 For more information consult the documentation for the FT_LOAD_*
 libfreetype flags.
 
-@item rate, r
-Set the timecode frame rate (timecode only).
-
 @item shadowcolor
 The color to be used for drawing a shadow behind the drawn text.  It
 can be a color name (e.g. "yellow") or a string in the 0xRRGGBB[AA]
@@ -1349,9 +1346,12 @@ Default value is 4.
 
 @item timecode
 Set the initial timecode representation in "hh:mm:ss[:;.]ff"
-format. It can be used with or without text parameter. @var{rate}
+format. It can be used with or without text parameter. @var{timecode_rate}
 option must be specified.
 
+@item timecode_rate, rate, r
+Set the timecode frame rate (timecode only).
+
 @item text
 The text string to be drawn. The text must be a sequence of UTF-8
 encoded characters.

libavfilter/version.h

@@ -30,7 +30,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  2
 #define LIBAVFILTER_VERSION_MINOR 72
-#define LIBAVFILTER_VERSION_MICRO 103
+#define LIBAVFILTER_VERSION_MICRO 104
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \

libavfilter/vf_drawtext.c

@@ -178,6 +178,7 @@ static const AVOption drawtext_options[]= {
 {"draw",     "if false do not draw", OFFSET(draw_expr),          AV_OPT_TYPE_STRING, {.str="1"},   CHAR_MIN, CHAR_MAX },
 {"timecode", "set initial timecode", OFFSET(tc_opt_string),      AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT,  {.dbl=0},            0,        1 },
+{"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate),   AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },
 {"r",        "set rate (timecode only)", OFFSET(tc_rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },
 {"rate",     "set rate (timecode only)", OFFSET(tc_rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },
 {"fix_bounds", "if true, check and fix text coords to avoid clipping",