diff --git a/libavfilter/dualinput.c b/libavfilter/dualinput.c
deleted file mode 100644
index 44750973a6..0000000000
--- a/libavfilter/dualinput.c
+++ /dev/null
@@ -1,90 +0,0 @@
-/*
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "dualinput.h"
-#include "libavutil/timestamp.h"
-
-static int process_frame(FFFrameSync *fs)
-{
-    AVFilterContext *ctx = fs->parent;
-    FFDualInputContext *s = fs->opaque;
-    AVFrame *mainpic = NULL, *secondpic = NULL;
-    int ret = 0;
-
-    if ((ret = ff_framesync_get_frame(&s->fs, 0, &mainpic,   1)) < 0 ||
-        (ret = ff_framesync_get_frame(&s->fs, 1, &secondpic, 0)) < 0) {
-        av_frame_free(&mainpic);
-        return ret;
-    }
-    av_assert0(mainpic);
-    mainpic->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[0]->time_base);
-    if (secondpic && !ctx->is_disabled)
-        mainpic = s->process(ctx, mainpic, secondpic);
-    ret = ff_filter_frame(ctx->outputs[0], mainpic);
-    av_assert1(ret != AVERROR(EAGAIN));
-    return ret;
-}
-
-int ff_dualinput_init(AVFilterContext *ctx, FFDualInputContext *s)
-{
-    FFFrameSyncIn *in;
-    int ret;
-
-    if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
-        return ret;
-
-    in = s->fs.in;
-    s->fs.opaque = s;
-    s->fs.on_event = process_frame;
-    in[0].time_base = ctx->inputs[0]->time_base;
-    in[1].time_base = ctx->inputs[1]->time_base;
-    in[0].sync   = 2;
-    in[0].before = EXT_STOP;
-    in[0].after  = EXT_INFINITY;
-    in[1].sync   = 1;
-    in[1].before = EXT_NULL;
-    in[1].after  = EXT_INFINITY;
-
-    if (s->shortest)
-        in[0].after = in[1].after = EXT_STOP;
-    if (!s->repeatlast) {
-        in[1].after = EXT_NULL;
-        in[1].sync  = 0;
-    }
-    if (s->skip_initial_unpaired) {
-        in[1].before = EXT_STOP;
-    }
-
-    return ff_framesync_configure(&s->fs);
-}
-
-int ff_dualinput_filter_frame(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);
-}
-
-void ff_dualinput_uninit(FFDualInputContext *s)
-{
-    ff_framesync_uninit(&s->fs);
-}
diff --git a/libavfilter/dualinput.h b/libavfilter/dualinput.h
deleted file mode 100644
index fcde0d6aa1..0000000000
--- a/libavfilter/dualinput.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * Double input streams helper for filters
- */
-
-#ifndef AVFILTER_DUALINPUT_H
-#define AVFILTER_DUALINPUT_H
-
-#include <stdint.h>
-#include "bufferqueue.h"
-#include "framesync.h"
-#include "internal.h"
-
-typedef struct FFDualInputContext {
-    FFFrameSync fs;
-
-    AVFrame *(*process)(AVFilterContext *ctx, AVFrame *main, const AVFrame *second);
-    int shortest;               ///< terminate stream when the second input terminates
-    int repeatlast;             ///< repeat last second frame
-    int skip_initial_unpaired;  ///< Skip initial frames that do not have a 2nd input
-} FFDualInputContext;
-
-int ff_dualinput_init(AVFilterContext *ctx, FFDualInputContext *s);
-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);
-
-#endif /* AVFILTER_DUALINPUT_H */