diff --git a/libavfilter/vf_drawbox.c b/libavfilter/vf_drawbox.c
index 723fec6d2f..656da70b2c 100644
--- a/libavfilter/vf_drawbox.c
+++ b/libavfilter/vf_drawbox.c
@@ -39,7 +39,8 @@ enum { Y, U, V, A };
 
 typedef struct {
     const AVClass *class;
-    int x, y, w, h, thickness;
+    int x, y, w_opt, h_opt, w, h;
+    int thickness;
     char *color_str;
     unsigned char yuv_color[4];
     int invert_color; ///< invert luma color
@@ -88,8 +89,8 @@ static int config_input(AVFilterLink *inlink)
     s->hsub = desc->log2_chroma_w;
     s->vsub = desc->log2_chroma_h;
 
-    if (s->w == 0) s->w = inlink->w;
-    if (s->h == 0) s->h = inlink->h;
+    s->w = (s->w_opt > 0) ? s->w_opt : inlink->w;
+    s->h = (s->h_opt > 0) ? s->h_opt : inlink->h;
 
     av_log(inlink->dst, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
            s->x, s->y, s->w, s->h,
@@ -141,10 +142,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 static const AVOption drawbox_options[] = {
     { "x",         "set horizontal position of the left box edge", OFFSET(x),         AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
     { "y",         "set vertical position of the top box edge",    OFFSET(y),         AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
-    { "width",     "set width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
-    { "w",         "set width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
-    { "height",    "set height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
-    { "h",         "set height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
+    { "width",     "set width of the box",                         OFFSET(w_opt),     AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
+    { "w",         "set width of the box",                         OFFSET(w_opt),     AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
+    { "height",    "set height of the box",                        OFFSET(h_opt),     AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
+    { "h",         "set height of the box",                        OFFSET(h_opt),     AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       INT_MAX, FLAGS },
     { "color",     "set color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
     { "c",         "set color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
     { "thickness", "set the box maximum thickness",                OFFSET(thickness), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, FLAGS },
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index f0ff5aad64..63c436242d 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -576,8 +576,6 @@ static int config_input(AVFilterLink *inlink)
     s->var_values[VAR_VSUB]  = 1 << s->dc.vsub_max;
     s->var_values[VAR_X]     = NAN;
     s->var_values[VAR_Y]     = NAN;
-    if (!s->reinit)
-        s->var_values[VAR_N] = 0;
     s->var_values[VAR_T]     = NAN;
 
     av_lfg_init(&s->prng, av_get_random_seed());
diff --git a/libavfilter/vf_fps.c b/libavfilter/vf_fps.c
index 6a67158c89..006c24577f 100644
--- a/libavfilter/vf_fps.c
+++ b/libavfilter/vf_fps.c
@@ -77,6 +77,8 @@ static av_cold int init(AVFilterContext *ctx)
     if (!(s->fifo = av_fifo_alloc(2*sizeof(AVFrame*))))
         return AVERROR(ENOMEM);
 
+    s->pts          = AV_NOPTS_VALUE;
+
     av_log(ctx, AV_LOG_VERBOSE, "fps=%d/%d\n", s->framerate.num, s->framerate.den);
     return 0;
 }
@@ -111,7 +113,6 @@ static int config_props(AVFilterLink* link)
     link->frame_rate= s->framerate;
     link->w         = link->src->inputs[0]->w;
     link->h         = link->src->inputs[0]->h;
-    s->pts          = AV_NOPTS_VALUE;
 
     return 0;
 }