lavu/opt: show valid range in case of out-of-range value

Improve feedback.

libavutil/opt.c

@@ -86,8 +86,8 @@ static int read_number(const AVOption *o, void *dst, double *num, int *den, int6
 static int write_number(void *obj, const AVOption *o, void *dst, double num, int den, int64_t intnum)
 {
     if (o->max*den < num*intnum || o->min*den > num*intnum) {
-        av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range\n",
-               num*intnum/den, o->name);
+        av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range [%g - %g]\n",
+               num*intnum/den, o->name, o->min, o->max);
         return AVERROR(ERANGE);
     }