diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9c15ed62d2..5416e0f34f 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -123,6 +123,7 @@ OBJS-$(CONFIG_ANULLSINK_FILTER)              += asink_anullsink.o
 # video filters
 OBJS-$(CONFIG_ALPHAEXTRACT_FILTER)           += vf_extractplanes.o
 OBJS-$(CONFIG_ALPHAMERGE_FILTER)             += vf_alphamerge.o
+OBJS-$(CONFIG_ANSNR_FILTER)                  += vf_ansnr.o dualinput.o framesync.o
 OBJS-$(CONFIG_ASS_FILTER)                    += vf_subtitles.o
 OBJS-$(CONFIG_ATADENOISE_FILTER)             += vf_atadenoise.o
 OBJS-$(CONFIG_AVGBLUR_FILTER)                += vf_avgblur.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 64b634e8f3..fbd9ec026e 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -134,6 +134,7 @@ static void register_all(void)
 
     REGISTER_FILTER(ALPHAEXTRACT,   alphaextract,   vf);
     REGISTER_FILTER(ALPHAMERGE,     alphamerge,     vf);
+    REGISTER_FILTER(ANSNR,          ansnr,          vf);
     REGISTER_FILTER(ASS,            ass,            vf);
     REGISTER_FILTER(ATADENOISE,     atadenoise,     vf);
     REGISTER_FILTER(AVGBLUR,        avgblur,        vf);
diff --git a/libavfilter/vf_ansnr.c b/libavfilter/vf_ansnr.c
new file mode 100644
index 0000000000..cfea6efbd4
--- /dev/null
+++ b/libavfilter/vf_ansnr.c
@@ -0,0 +1,425 @@
+/*
+ * Copyright (c) 2017 Betty Wu
+ *
+ * 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
+ * Caculate the ANSNR between two input videos.
+ * @author Betty Wu
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "dualinput.h"
+#include "drawutils.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define OPT_RANGE_PIXEL_OFFSET -128
+
+typedef double number_t;
+
+typedef struct ANSNRContext {
+    const AVClass *class;
+    FFDualInputContext dinput;
+    uint64_t nb_frames;
+    FILE *stats_file;
+    char *stats_file_str;
+    int stats_version;
+    int stats_header_written;
+    int stats_add_max;
+    int is_rgb;
+    uint8_t rgba_map[4];
+    double score;
+    double score_total;
+    char comps[4];
+    int nb_components;
+    int planewidth[4];
+    int planeheight[4];
+
+} ANSNRContext;
+#define OFFSET(x) offsetof(ANSNRContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption ansnr_options[] = {
+    {"stats_file", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
+    {"f",          "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
+    { NULL }
+};
+AVFILTER_DEFINE_CLASS(ansnr);
+
+const int ans_filter3_stride = 3;
+const int ans_filter5_stride = 5;
+
+const double ans_filter3[ans_filter3_stride*ans_filter3_stride] = {
+    1.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0,
+    2.0 / 16.0, 4.0 / 16.0, 2.0 / 16.0,
+    1.0 / 16.0, 2.0 / 16.0, 1.0 / 16.0
+};
+
+const double ans_filter5[ans_filter5_stride*ans_filter5_stride] = {
+    2.0 / 571.0,  7.0 / 571.0,  12.0 / 571.0,  7.0 / 571.0,  2.0 / 571.0,
+    7.0 / 571.0,  31.0 / 571.0, 52.0 / 571.0,  31.0 / 571.0, 7.0 / 571.0,
+    12.0 / 571.0, 52.0 / 571.0, 127.0 / 571.0, 52.0 / 571.0, 12.0 / 571.0,
+    7.0 / 571.0,  31.0 / 571.0, 52.0 / 571.0,  31.0 / 571.0, 7.0 / 571.0,
+    2.0 / 571.0,  7.0 / 571.0,  12.0 / 571.0,  7.0 / 571.0,  2.0 / 571.0
+};
+
+static inline number_t pow_2(number_t base)
+{
+    return base*base;
+}
+
+static inline double get_ansnr(double score)
+{
+    return 10.0 * log10(score);
+}
+
+static inline double get_pow(double score)
+{
+    return pow(10, score/10.0);
+}
+
+static void ansnr_mse(const number_t *ref, const number_t *dis, number_t *img_sig, number_t *img_noise, int row, int col)
+{
+    int ref_stride = col;
+    int dis_stride = col;
+
+    *img_sig = 0;
+    *img_noise = 0;
+
+    for (int i = 0; i < row; ++i) {
+        for (int j = 0; j < col; ++j) {
+            int ref_index = i * ref_stride + j;
+            int dis_index = i * dis_stride + j;
+
+            *img_sig   += pow_2(ref[ref_index]);
+            *img_noise += pow_2(ref[ref_index] - dis[dis_index]);
+        }
+    }
+}
+
+static int ansnr_filter(const uint8_t* src_image, number_t* dst_image, int img_row, int img_col, const double *filter, int stride)
+{
+    int filter_row = stride;
+    int filter_col = stride;
+    int start_row = filter_row / 2;
+    int start_col = filter_col / 2;
+    int imme_row = img_row + 2 * start_row;
+    int imme_col = img_col + 2 * start_col;
+
+    number_t **imme_image;
+    if(!(imme_image = (number_t **)av_malloc((size_t)imme_row * sizeof(number_t *))))
+        return AVERROR(ENOMEM);
+
+    for(int i = 0; i < imme_row; i++) {
+        if(!(imme_image[i] = (number_t *)av_malloc((size_t)imme_col * sizeof(number_t))))
+            return AVERROR(ENOMEM);
+    }
+
+    for (int i = 0; i < imme_row; i++) {
+        for (int j = 0; j < imme_col; j++) {
+            int src_i = i - start_row;
+            int src_j = j - start_col;
+
+            src_i = abs(src_i) >= img_row? 2 * img_row - abs(src_i) - 1 : abs(src_i);
+            src_j = abs(src_j) >= img_col? 2 * img_col - abs(src_j) - 1 : abs(src_j);
+
+            imme_image[i][j] = (number_t)src_image[src_i * img_col + src_j] + OPT_RANGE_PIXEL_OFFSET;
+        }
+    }
+
+    int end_row = imme_row -1 - start_row ;
+    int end_col = imme_col -1 - start_col ;
+
+    for (int i = start_row; i <= end_row; i++) {
+        for (int j = start_col; j <= end_col; j++) {
+            int dst_i = i - start_row  ;
+            int dst_j = j - start_col  ;
+            int dst_index = dst_i * img_col + dst_j;
+            dst_image[dst_index] = 0;
+
+            for (int m = 0; m < filter_row; m++) {
+                for (int n = 0; n < filter_col; n++) {
+                    dst_image[dst_index] += (imme_image[dst_i + m][dst_j + n] * filter[m * filter_col + n]);
+                }
+            }
+        }
+    }
+
+    for(int i = 0; i < imme_row; i++)
+        av_free(imme_image[i]);
+    av_free(imme_image);
+    
+    return 0;
+}
+
+static inline
+int compute_ansnr(const uint8_t *anc, const uint8_t *dis, int col, int row, double psnr_max, double *score, double *out)
+{
+    *score = 0.0;
+    *out = 0.0;
+
+    number_t *anc_after;
+    if(!(anc_after = (number_t *)av_malloc((size_t)row * col * sizeof(number_t)))) {
+        av_free(anc_after);
+        return AVERROR(ENOMEM);
+    }
+
+    number_t *dis_after;
+    if(!(dis_after = (number_t *)av_malloc((size_t)row * col * sizeof(number_t)))) {
+        av_free(dis_after);
+        return AVERROR(ENOMEM);
+    }
+
+    int ret;
+    ret = ansnr_filter(anc, anc_after, row, col, ans_filter3, ans_filter3_stride);
+    if(ret < 0)
+        return ret;
+    ret = ansnr_filter(dis, dis_after, row, col, ans_filter5, ans_filter5_stride);
+    if(ret < 0)
+        return ret;
+
+    number_t sig, noise;
+
+    ansnr_mse(anc_after, dis_after, &sig, &noise, row, col);
+    *score = noise==0 ? psnr_max : get_ansnr((double)sig / noise);
+    *out = get_pow(*score);
+
+    av_free(anc_after);
+    av_free(dis_after);
+
+    return 0;
+}
+
+static void set_meta(AVDictionary **metadata, const char *key, char comp, float d)
+{
+    char value[128];
+    snprintf(value, sizeof(value), "%0.2f", d);
+    if (comp) {
+        char key2[128];
+        snprintf(key2, sizeof(key2), "%s%c", key, comp);
+        av_dict_set(metadata, key2, value, 0);
+    } else {
+        av_dict_set(metadata, key, value, 0);
+    }
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
+#define PF_NOALPHA(suf) AV_PIX_FMT_YUV420##suf,  AV_PIX_FMT_YUV422##suf,  AV_PIX_FMT_YUV444##suf
+#define PF_ALPHA(suf)   AV_PIX_FMT_YUVA420##suf, AV_PIX_FMT_YUVA422##suf, AV_PIX_FMT_YUVA444##suf
+#define PF(suf)         PF_NOALPHA(suf), PF_ALPHA(suf)
+        PF(P), PF(P9), PF(P10), PF_NOALPHA(P12), PF_NOALPHA(P14), PF(P16),
+        AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+        AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
+        AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
+        AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+        AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP16,
+        AV_PIX_FMT_NONE
+    };
+
+    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+    if (!fmts_list)
+        return AVERROR(ENOMEM);
+    return ff_set_common_formats(ctx, fmts_list);
+}
+
+static AVFrame *do_ansnr(AVFilterContext *ctx, AVFrame *main,
+                        const AVFrame *ref)
+{
+    ANSNRContext *s = ctx->priv;
+    AVDictionary **metadata = avpriv_frame_get_metadatap(main);
+    double psnr_max;
+    char *frame_format = (char *)av_get_pix_fmt_name(main->format);
+
+    if( !strcmp(frame_format,"yuv420p") || !strcmp(frame_format,"yuv422p") || !strcmp(frame_format,"yuv444p"))
+        psnr_max = 60;
+    if( !strcmp(frame_format,"yuv420p10le") || !strcmp(frame_format,"yuv422p10le") || !strcmp(frame_format,"yuv444p10le"))
+        psnr_max = 72;
+
+    double score = 0.0;
+    double out = 0.0;
+
+    compute_ansnr(ref->data[0], main->data[0], s->planewidth[0], s->planeheight[0], psnr_max, &score, &out);
+    s->nb_frames++;
+    s->score = score;
+    s->score_total += out;
+
+    set_meta(metadata, "lavfi.ansnr.All", 0, score);
+
+    if (s->stats_file) {
+        fprintf(s->stats_file, "n:%"PRId64" ", s->nb_frames);
+        fprintf(s->stats_file, "All:%f\n", score);
+    }
+
+    return main;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    ANSNRContext *s = ctx->priv;
+    s->score_total = 0;
+    s->score = 0;
+
+    if (s->stats_file_str) {
+        if (s->stats_version < 2 && s->stats_add_max) {
+            av_log(ctx, AV_LOG_ERROR,
+                "stats_add_max was specified but stats_version < 2.\n" );
+            return AVERROR(EINVAL);
+        }
+
+        if (!strcmp(s->stats_file_str, "-")) {
+            s->stats_file = stdout;
+        } else {
+            s->stats_file = fopen(s->stats_file_str, "w");
+            if (!s->stats_file) {
+                int err = AVERROR(errno);
+                char buf[128];
+                av_strerror(err, buf, sizeof(buf));
+                av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
+                       s->stats_file_str, buf);
+                return err;
+            }
+        }
+    }
+
+    s->dinput.process = do_ansnr;
+    return 0;
+}
+
+static int config_input_ref(AVFilterLink *inlink)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    AVFilterContext *ctx  = inlink->dst;
+    ANSNRContext *s = ctx->priv;
+
+    s->nb_components = desc->nb_components;
+
+    if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
+        ctx->inputs[0]->h != ctx->inputs[1]->h) {
+        av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
+        return AVERROR(EINVAL);
+    }
+    if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
+        av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
+        return AVERROR(EINVAL);
+    }
+    s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
+    s->comps[0] = s->is_rgb ? 'r' : 'y' ;
+    s->comps[1] = s->is_rgb ? 'g' : 'u' ;
+    s->comps[2] = s->is_rgb ? 'b' : 'v' ;
+    s->comps[3] = 'a';
+
+    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+    s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planewidth[0]  = s->planewidth[3]  = inlink->w;
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    ANSNRContext *s = ctx->priv;
+    AVFilterLink *mainlink = ctx->inputs[0];
+    int ret;
+
+    outlink->w = mainlink->w;
+    outlink->h = mainlink->h;
+    outlink->time_base = mainlink->time_base;
+    outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
+    outlink->frame_rate = mainlink->frame_rate;
+
+    if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
+        return ret;
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
+{
+    ANSNRContext *s = inlink->dst->priv;
+    return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+    ANSNRContext *s = outlink->src->priv;
+    return ff_dualinput_request_frame(&s->dinput, outlink);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    ANSNRContext *s = ctx->priv;
+
+    if (s->nb_frames > 0) {
+        char buf[256];
+        buf[0] = 0;
+        av_log(ctx, AV_LOG_INFO, "ANSNR%s All:%f\n", buf, get_ansnr(s->score_total));
+    }
+
+    ff_dualinput_uninit(&s->dinput);
+
+    if (s->stats_file && s->stats_file != stdout)
+        fclose(s->stats_file);
+}
+
+static const AVFilterPad ansnr_inputs[] = {
+    {
+        .name         = "main",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+    },{
+        .name         = "reference",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+        .config_props = config_input_ref,
+    },
+    { NULL }
+};
+
+static const AVFilterPad ansnr_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = config_output,
+        .request_frame = request_frame,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_ansnr = {
+    .name          = "ansnr",
+    .description   = NULL_IF_CONFIG_SMALL("Calculate the ANSNR between two video streams."),
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .priv_size     = sizeof(ANSNRContext),
+    .priv_class    = &ansnr_class,
+    .inputs        = ansnr_inputs,
+    .outputs       = ansnr_outputs,
+};
