diff --git a/libavfilter/dualinput.c b/libavfilter/dualinput.c
index 4dc1708527..97e15cbe01 100644
--- a/libavfilter/dualinput.c
+++ b/libavfilter/dualinput.c
@@ -66,18 +66,12 @@ int ff_dualinput_init(AVFilterContext *ctx, FFDualInputContext *s)
     return ff_framesync_configure(&s->fs);
 }
 
-int ff_dualinput_filter_frame_main(FFDualInputContext *s,
+int ff_dualinput_filter_frame(FFDualInputContext *s,
                                    AVFilterLink *inlink, AVFrame *in)
 {
     return ff_framesync_filter_frame(&s->fs, inlink, in);
 }
 
-int ff_dualinput_filter_frame_second(FFDualInputContext *s,
-                                     AVFilterLink *inlink, AVFrame *in)
-{
-    return ff_framesync_filter_frame(&s->fs, inlink, in);
-}
-
 int ff_dualinput_request_frame(FFDualInputContext *s, AVFilterLink *outlink)
 {
     return ff_framesync_request_frame(&s->fs, outlink);
diff --git a/libavfilter/dualinput.h b/libavfilter/dualinput.h
index c22066f36e..0ec0ea7350 100644
--- a/libavfilter/dualinput.h
+++ b/libavfilter/dualinput.h
@@ -39,8 +39,7 @@ typedef struct {
 } FFDualInputContext;
 
 int ff_dualinput_init(AVFilterContext *ctx, FFDualInputContext *s);
-int ff_dualinput_filter_frame_main(FFDualInputContext *s, AVFilterLink *inlink, AVFrame *in);
-int ff_dualinput_filter_frame_second(FFDualInputContext *s, AVFilterLink *inlink, AVFrame *in);
+int ff_dualinput_filter_frame(FFDualInputContext *s, AVFilterLink *inlink, AVFrame *in);
 int ff_dualinput_request_frame(FFDualInputContext *s, AVFilterLink *outlink);
 void ff_dualinput_uninit(FFDualInputContext *s);
 
diff --git a/libavfilter/vf_blend.c b/libavfilter/vf_blend.c
index 3bc8eec26e..a5c8e9fb28 100644
--- a/libavfilter/vf_blend.c
+++ b/libavfilter/vf_blend.c
@@ -422,27 +422,21 @@ static int request_frame(AVFilterLink *outlink)
     return ff_dualinput_request_frame(&b->dinput, outlink);
 }
 
-static int filter_frame_top(AVFilterLink *inlink, AVFrame *buf)
+static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 {
     BlendContext *b = inlink->dst->priv;
-    return ff_dualinput_filter_frame_main(&b->dinput, inlink, buf);
-}
-
-static int filter_frame_bottom(AVFilterLink *inlink, AVFrame *buf)
-{
-    BlendContext *b = inlink->dst->priv;
-    return ff_dualinput_filter_frame_second(&b->dinput, inlink, buf);
+    return ff_dualinput_filter_frame(&b->dinput, inlink, buf);
 }
 
 static const AVFilterPad blend_inputs[] = {
     {
         .name          = "top",
         .type          = AVMEDIA_TYPE_VIDEO,
-        .filter_frame  = filter_frame_top,
+        .filter_frame  = filter_frame,
     },{
         .name          = "bottom",
         .type          = AVMEDIA_TYPE_VIDEO,
-        .filter_frame  = filter_frame_bottom,
+        .filter_frame  = filter_frame,
     },
     { NULL }
 };
diff --git a/libavfilter/vf_lut3d.c b/libavfilter/vf_lut3d.c
index 3c1b482d4e..cc15f20c13 100644
--- a/libavfilter/vf_lut3d.c
+++ b/libavfilter/vf_lut3d.c
@@ -667,16 +667,10 @@ static int config_output(AVFilterLink *outlink)
     return 0;
 }
 
-static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref)
+static int filter_frame_hald(AVFilterLink *inlink, AVFrame *inpicref)
 {
     LUT3DContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame_main(&s->dinput, inlink, inpicref);
-}
-
-static int filter_frame_clut(AVFilterLink *inlink, AVFrame *inpicref)
-{
-    LUT3DContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame_second(&s->dinput, inlink, inpicref);
+    return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
 }
 
 static int request_frame(AVFilterLink *outlink)
@@ -766,12 +760,12 @@ static const AVFilterPad haldclut_inputs[] = {
     {
         .name         = "main",
         .type         = AVMEDIA_TYPE_VIDEO,
-        .filter_frame = filter_frame_main,
+        .filter_frame = filter_frame_hald,
         .config_props = config_input,
     },{
         .name         = "clut",
         .type         = AVMEDIA_TYPE_VIDEO,
-        .filter_frame = filter_frame_clut,
+        .filter_frame = filter_frame_hald,
         .config_props = config_clut,
     },
     { NULL }
diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c
index c3f1c2edb2..b5ade85401 100644
--- a/libavfilter/vf_overlay.c
+++ b/libavfilter/vf_overlay.c
@@ -549,16 +549,10 @@ static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,
     return mainpic;
 }
 
-static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref)
+static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
 {
     OverlayContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame_main(&s->dinput, inlink, inpicref);
-}
-
-static int filter_frame_over(AVFilterLink *inlink, AVFrame *inpicref)
-{
-    OverlayContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame_second(&s->dinput, inlink, inpicref);
+    return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
 }
 
 static int request_frame(AVFilterLink *outlink)
@@ -606,14 +600,14 @@ static const AVFilterPad avfilter_vf_overlay_inputs[] = {
         .name         = "main",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = config_input_main,
-        .filter_frame = filter_frame_main,
+        .filter_frame = filter_frame,
         .needs_writable = 1,
     },
     {
         .name         = "overlay",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = config_input_overlay,
-        .filter_frame = filter_frame_over,
+        .filter_frame = filter_frame,
     },
     { NULL }
 };
diff --git a/libavfilter/vf_psnr.c b/libavfilter/vf_psnr.c
index c4af4ac7c6..353f5358d0 100644
--- a/libavfilter/vf_psnr.c
+++ b/libavfilter/vf_psnr.c
@@ -320,16 +320,10 @@ static int config_output(AVFilterLink *outlink)
     return 0;
 }
 
-static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref)
+static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
 {
     PSNRContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame_main(&s->dinput, inlink, inpicref);
-}
-
-static int filter_frame_ref(AVFilterLink *inlink, AVFrame *inpicref)
-{
-    PSNRContext *s = inlink->dst->priv;
-    return ff_dualinput_filter_frame_second(&s->dinput, inlink, inpicref);
+    return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
 }
 
 static int request_frame(AVFilterLink *outlink)
@@ -359,11 +353,11 @@ static const AVFilterPad psnr_inputs[] = {
     {
         .name         = "main",
         .type         = AVMEDIA_TYPE_VIDEO,
-        .filter_frame = filter_frame_main,
+        .filter_frame = filter_frame,
     },{
         .name         = "reference",
         .type         = AVMEDIA_TYPE_VIDEO,
-        .filter_frame = filter_frame_ref,
+        .filter_frame = filter_frame,
         .config_props = config_input_ref,
     },
     { NULL }