[FFmpeg-devel] [PATCH] add phqm filter and img_hash
ckennedy at ellation.com
ckennedy at ellation.com
Sat Oct 26 15:00:25 EEST 2019
From: Christopher Kennedy <ckennedy at ellation.com>
this adds a phqm filter and OpenCV img_hash based resource usable
by the phqm and future filters using image hash functionality
from OpenCV.
C++ to C handling so that full OpenCV functionality and API can
be used instead of the C versions (which are incomplete and
don't always exist).
Example command line:
ffmpeg -i encode.mp4 -i reference.mp4 \
-filter_complex "[0:v][1:v]phqm=stats_file=out.log" \
-y -f null /dev/null
Signed-off-by: Christopher Kennedy <ckennedy at ellation.com>
---
Changelog | 1 +
configure | 2 +
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 1 +
libavfilter/img_hash.cpp | 98 ++++++++++++
libavfilter/img_hash.h | 46 ++++++
libavfilter/vf_phqm.c | 334 +++++++++++++++++++++++++++++++++++++++
7 files changed, 484 insertions(+)
create mode 100644 libavfilter/img_hash.cpp
create mode 100644 libavfilter/img_hash.h
create mode 100644 libavfilter/vf_phqm.c
diff --git a/Changelog b/Changelog
index 316589e336..4a22f77d37 100644
--- a/Changelog
+++ b/Changelog
@@ -17,6 +17,7 @@ version <next>:
- anlms filter
- arnndn filter
- bilateral filter
+- phqm perceptual hash filter using OpenCV img_lib
version 4.2:
diff --git a/configure b/configure
index 8413826f9e..e231d359bb 100755
--- a/configure
+++ b/configure
@@ -3497,6 +3497,8 @@ nlmeans_opencl_filter_deps="opencl"
nnedi_filter_deps="gpl"
ocr_filter_deps="libtesseract"
ocv_filter_deps="libopencv"
+phqm_filter_deps="libopencv"
+phqm_filter_extralibs="-lstdc++ -lopencv_img_hash"
openclsrc_filter_deps="opencl"
overlay_opencl_filter_deps="opencl"
overlay_qsv_filter_deps="libmfx"
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 63d2fba861..645e232b3e 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -325,6 +325,7 @@ OBJS-$(CONFIG_PERMS_FILTER) += f_perms.o
OBJS-$(CONFIG_PERSPECTIVE_FILTER) += vf_perspective.o
OBJS-$(CONFIG_PHASE_FILTER) += vf_phase.o
OBJS-$(CONFIG_PHOTOSENSITIVITY_FILTER) += vf_photosensitivity.o
+OBJS-$(CONFIG_PHQM_FILTER) += vf_phqm.o img_hash.o
OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
OBJS-$(CONFIG_PIXSCOPE_FILTER) += vf_datascope.o
OBJS-$(CONFIG_PP_FILTER) += vf_pp.o
@@ -498,6 +499,7 @@ OBJS-$(CONFIG_SHARED) += log2_tab.o
SKIPHEADERS-$(CONFIG_QSVVPP) += qsvvpp.h
SKIPHEADERS-$(CONFIG_OPENCL) += opencl.h
SKIPHEADERS-$(CONFIG_VAAPI) += vaapi_vpp.h
+SKIPHEADERS-$(CONFIG_LIBOPENCV) += img_hash.h
TOOLS = graph2dot
TESTPROGS = drawutils filtfmts formats integral
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index e4186f93db..f0fcaad235 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -309,6 +309,7 @@ extern AVFilter ff_vf_perms;
extern AVFilter ff_vf_perspective;
extern AVFilter ff_vf_phase;
extern AVFilter ff_vf_photosensitivity;
+extern AVFilter ff_vf_phqm;
extern AVFilter ff_vf_pixdesctest;
extern AVFilter ff_vf_pixscope;
extern AVFilter ff_vf_pp;
diff --git a/libavfilter/img_hash.cpp b/libavfilter/img_hash.cpp
new file mode 100644
index 0000000000..4d5843da22
--- /dev/null
+++ b/libavfilter/img_hash.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2019 Christopher Kennedy
+ *
+ * OpenCV img_hash
+ *
+ * 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 <opencv2/core.hpp>
+#include <opencv2/core/ocl.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/img_hash.hpp>
+#include <opencv2/imgproc.hpp>
+
+#include <iostream>
+
+#include "img_hash.h"
+#include "libavutil/pixdesc.h"
+extern "C" {
+#include "avfilter.h"
+}
+
+// convert from avframe to iplimage format
+static int fill_iplimage_from_frame(IplImage *img, const AVFrame *frame, enum AVPixelFormat pixfmt)
+{
+ IplImage *tmpimg;
+ int depth = IPL_DEPTH_8U, channels_nb;
+
+ switch (pixfmt) {
+ case AV_PIX_FMT_GRAY8: channels_nb = 1; break;
+ case AV_PIX_FMT_BGRA: channels_nb = 4; break;
+ case AV_PIX_FMT_BGR24: channels_nb = 3; break;
+ default: return -1;
+ }
+
+ tmpimg = cvCreateImageHeader((CvSize){frame->width, frame->height}, depth, channels_nb);
+ *img = *tmpimg;
+ img->imageData = img->imageDataOrigin = (char *) frame->data[0];
+ img->dataOrder = IPL_DATA_ORDER_PIXEL;
+ img->origin = IPL_ORIGIN_TL;
+ img->widthStep = frame->linesize[0];
+
+ return 0;
+}
+
+// Get the score of two Video Frames by comparing the perceptual hashes and deriving a hamming distance
+// showing how similar they are or different. lower score is better for most algorithms
+extern "C" double getScore(const AVFrame *frame1, const AVFrame *frame2, enum AVPixelFormat pixfmt, int hash_type) {
+ cv::Ptr<cv::img_hash::ImgHashBase> algo;
+ IplImage ipl1, ipl2;
+ cv::Mat h1;
+ cv::Mat h2;
+ cv::Mat m1;
+ cv::Mat m2;
+
+ // Take FFmpeg video frame and convert into an IplImage for OpenCV
+ if (fill_iplimage_from_frame(&ipl1, frame1, pixfmt) != 0 ||
+ fill_iplimage_from_frame(&ipl2, frame2, pixfmt) != 0)
+ return DBL_MAX; // Return an invalid value if either fails
+
+ // Convert an IplImage to an Mat Image for OpenCV (newer format)
+ m1 = cv::cvarrToMat(&ipl1);
+ m2 = cv::cvarrToMat(&ipl2);
+
+ // substantiate the hash type algorithm
+ switch (hash_type) {
+ case PHASH: algo = cv::img_hash::PHash::create(); break;
+ case AVERAGE: algo = cv::img_hash::AverageHash::create(); break;
+ case MARRHILDRETH: algo = cv::img_hash::MarrHildrethHash::create(); break;
+ case RADIALVARIANCE: algo = cv::img_hash::RadialVarianceHash::create(); break;
+ // BlockMeanHash support mode 0 and mode 1, they associate to
+ // mode 1 and mode 2 of PHash library
+ case BLOCKMEAN1: algo = cv::img_hash::BlockMeanHash::create(0); break;
+ case BLOCKMEAN2: algo = cv::img_hash::BlockMeanHash::create(1); break;
+ case COLORMOMENT: algo = cv::img_hash::ColorMomentHash::create(); break;
+ }
+
+ // Compute the hash
+ algo->compute(m1, h1);
+ algo->compute(m2, h2);
+
+ // Compare the hashes and return the hamming distance
+ return algo->compare(h1, h2);
+}
diff --git a/libavfilter/img_hash.h b/libavfilter/img_hash.h
new file mode 100644
index 0000000000..76f55c3013
--- /dev/null
+++ b/libavfilter/img_hash.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2019 Christopher Kennedy
+ *
+ * PHQM Perceptual Hash Quality Metric
+ *
+ * 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
+ */
+
+#ifndef AVFILTER_IMG_HASH_H
+#define AVFILTER_IMG_HASH_H
+
+#include "avfilter.h"
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+#define AVERAGE 0
+#define BLOCKMEAN1 1
+#define BLOCKMEAN2 2
+#define COLORMOMENT 3
+#define MARRHILDRETH 4
+#define PHASH 5
+#define RADIALVARIANCE 6
+
+double getScore(const AVFrame *frame1, const AVFrame *frame2, enum AVPixelFormat pixfmt, int hash_type);
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
diff --git a/libavfilter/vf_phqm.c b/libavfilter/vf_phqm.c
new file mode 100644
index 0000000000..0930386b10
--- /dev/null
+++ b/libavfilter/vf_phqm.c
@@ -0,0 +1,334 @@
+/*
+ * Copyright (c) 2019 Christopher Kennedy
+ *
+ * PHQM Perceptual Hash Quality Metric
+ *
+ * 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
+ * PHQM: Calculate the Image Hash Hamming Difference between two input videos.
+ */
+
+#include <float.h>
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "drawutils.h"
+#include "formats.h"
+#include "framesync.h"
+#include "internal.h"
+#include "video.h"
+
+#include "img_hash.h"
+#include "scene_sad.h"
+
+typedef struct PHQMContext {
+ const AVClass *class;
+ FFFrameSync fs;
+ double shd, hd, min_hd, max_hd, smin_hd, smax_hd;
+ uint64_t nb_shd;
+ uint64_t nb_frames;
+ FILE *stats_file;
+ char *stats_file_str;
+ int hash_type;
+ ff_scene_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
+ double prev_mafd; ///< previous MAFD (scene detect only)
+ AVFrame *prev_picref; ///< previous frame (scene detect only)
+ double scd_thresh;
+ double scene_score;
+} PHQMContext;
+
+#define OFFSET(x) offsetof(PHQMContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption phqm_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 },
+ { "scd_thresh", "Scene Change Detection Threshold.", OFFSET(scd_thresh), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, FLAGS },
+ { "hash_type", "Type of Image Hash to use from OpenCV.", OFFSET(hash_type), AV_OPT_TYPE_INT, {.i64 = PHASH}, 0, 6, FLAGS, "hash_type" },
+ { "average", "Average Hash", 0, AV_OPT_TYPE_CONST, {.i64 = AVERAGE}, 0, 0, FLAGS, "hash_type" },
+ { "blockmean1", "Block Mean Hash 1", 0, AV_OPT_TYPE_CONST, {.i64 = BLOCKMEAN1}, 0, 0, FLAGS, "hash_type" },
+ { "blockmean2", "Block Mean Hash 2", 0, AV_OPT_TYPE_CONST, {.i64 = BLOCKMEAN2}, 0, 0, FLAGS, "hash_type" },
+ { "colormoment", "Color Moment Hash", 0, AV_OPT_TYPE_CONST, {.i64 = COLORMOMENT}, 0, 0, FLAGS, "hash_type" },
+ { "marrhildreth", "Marr Hildreth Hash", 0, AV_OPT_TYPE_CONST, {.i64 = MARRHILDRETH}, 0, 0, FLAGS, "hash_type" },
+ { "phash", "Perceptual Hash (PHash)", 0, AV_OPT_TYPE_CONST, {.i64 = PHASH}, 0, 0, FLAGS, "hash_type" },
+ { "radialvariance", "Radial Variance Hash", 0, AV_OPT_TYPE_CONST, {.i64 = RADIALVARIANCE}, 0, 0, FLAGS, "hash_type" },
+ { NULL }
+};
+
+FRAMESYNC_DEFINE_CLASS(phqm, PHQMContext, fs);
+
+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 double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
+{
+ double ret = 0.;
+ PHQMContext *s = ctx->priv;
+ AVFrame *prev_picref = s->prev_picref;
+
+ if (prev_picref &&
+ frame->height == prev_picref->height &&
+ frame->width == prev_picref->width) {
+ uint64_t sad;
+ double mafd, diff;
+
+ s->sad(prev_picref->data[0], prev_picref->linesize[0], frame->data[0], frame->linesize[0], frame->width * 3, frame->height, &sad);
+ emms_c();
+ mafd = (double)sad / (frame->width * 3 * frame->height);
+ diff = fabs(mafd - s->prev_mafd);
+ ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
+ s->prev_mafd = mafd;
+ av_frame_free(&prev_picref);
+ }
+ s->prev_picref = av_frame_clone(frame);
+ return ret;
+}
+
+static int do_phqm(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ PHQMContext *s = ctx->priv;
+ AVFrame *master, *ref;
+ double hd = 0.;
+ int ret;
+ double hd_limit = 1000000.;
+ AVDictionary **metadata;
+
+ ret = ff_framesync_dualinput_get(fs, &master, &ref);
+ if (ret < 0)
+ return ret;
+ if (!ref)
+ return ff_filter_frame(ctx->outputs[0], master);
+ metadata = &master->metadata;
+
+
+ s->nb_frames++;
+
+ /* scene change detection score */
+ s->scene_score = get_scene_score(ctx, ref);
+ if (s->scene_score >= s->scd_thresh && s->nb_shd >= 48) {
+ av_log(s, AV_LOG_INFO, "ImgHashScene: n:%"PRId64"-%"PRId64" hd_avg:%0.3lf hd_min:%0.3lf hd_max:%0.3lf scd:%0.2lf\n",
+ (s->nb_frames - s->nb_shd), s->nb_frames - 1, (s->shd / s->nb_shd), s->smin_hd, s->smax_hd, s->scene_score);
+ s->shd = 0.;
+ s->nb_shd = 0;
+ s->smin_hd = 0.;
+ s->smax_hd = 0.;
+ }
+
+ /* limit the highest value so we cut off at perceptual difference match */
+ switch (s->hash_type) {
+ case PHASH:
+ case AVERAGE: hd_limit = 5; break;
+ case MARRHILDRETH: hd_limit = 30; break;
+ case RADIALVARIANCE: hd_limit = 0.9; break;
+ case BLOCKMEAN1: hd_limit = 12; break;
+ case BLOCKMEAN2: hd_limit = 48; break;
+ case COLORMOMENT: hd_limit = 8; break;
+ }
+
+ /* get ref / enc perceptual hashes and calc hamming distance difference value */
+ hd = getScore(ref, master, ref->format, s->hash_type);
+ if (hd == DBL_MAX) {
+ av_log(s, AV_LOG_ERROR, "Failure with handling pix_fmt of AVFrame for conversion to IPLimage.\n");
+ return AVERROR(EINVAL);
+ }
+ s->hd += FFMIN(hd, hd_limit);
+ set_meta(metadata, "lavfi.phqm.phqm", 0, hd);
+
+ /* scene hamming distance avg */
+ s->shd += FFMIN(hd, hd_limit);
+ s->nb_shd++;
+ av_log(s, AV_LOG_DEBUG, "ImgHashFrame: hd:%0.3lf scd:%0.2lf\n", hd, s->scene_score);
+
+ s->min_hd = FFMIN(s->min_hd, hd);
+ s->max_hd = FFMAX(s->max_hd, hd);
+ s->smin_hd = FFMIN(s->smin_hd, hd);
+ s->smax_hd = FFMAX(s->smax_hd, hd);
+
+ if (s->stats_file) {
+ fprintf(s->stats_file,
+ "n:%"PRId64" phqm:%0.3f phqm_min:%0.3f phqm_max:%0.3f sad:%0.2f",
+ s->nb_frames, hd, s->min_hd, s->max_hd, s->scene_score);
+ fprintf(s->stats_file, "\n");
+ }
+
+ return ff_filter_frame(ctx->outputs[0], master);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ PHQMContext *s = ctx->priv;
+
+ if (s->stats_file_str) {
+ 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->sad = ff_scene_sad_get_fn(8);
+ if (!s->sad)
+ return AVERROR(EINVAL);
+
+ s->fs.on_event = do_phqm;
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ PHQMContext *s = ctx->priv;
+ AVFilterFormats *fmts_list = NULL;
+ static const enum AVPixelFormat gray8_pix_fmts[] = {
+ AV_PIX_FMT_GRAY8,
+ AV_PIX_FMT_NONE
+ };
+ static const enum AVPixelFormat bgr24_pix_fmts[] = {
+ AV_PIX_FMT_BGR24,
+ AV_PIX_FMT_NONE
+ };
+ static const enum AVPixelFormat bgra_pix_fmts[] = {
+ AV_PIX_FMT_BGRA,
+ AV_PIX_FMT_NONE
+ };
+
+ switch (s->hash_type) {
+ case COLORMOMENT: fmts_list = ff_make_format_list(bgr24_pix_fmts); break;
+ case MARRHILDRETH: fmts_list = ff_make_format_list(bgra_pix_fmts); break;
+ /* all other hashes take the gray8 format */
+ default: fmts_list = ff_make_format_list(gray8_pix_fmts); break;
+ }
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int config_input_ref(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+
+ 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);
+ }
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ PHQMContext *s = ctx->priv;
+ AVFilterLink *mainlink = ctx->inputs[0];
+ int ret;
+
+ ret = ff_framesync_init_dualinput(&s->fs, ctx);
+ if (ret < 0)
+ return 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_framesync_configure(&s->fs)) < 0)
+ return ret;
+
+ return 0;
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ PHQMContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ PHQMContext *s = ctx->priv;
+
+ if (s->nb_frames > 0)
+ av_log(ctx, AV_LOG_WARNING, "PHQM average:%f min:%f max:%f\n",
+ s->hd / s->nb_frames, s->min_hd, s->max_hd);
+
+ ff_framesync_uninit(&s->fs);
+
+ if (s->stats_file && s->stats_file != stdout)
+ fclose(s->stats_file);
+ av_frame_free(&s->prev_picref);
+}
+
+static const AVFilterPad phqm_inputs[] = {
+ {
+ .name = "main",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },{
+ .name = "reference",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input_ref,
+ },
+ { NULL }
+};
+
+static const AVFilterPad phqm_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_phqm= {
+ .name = "phqm",
+ .description = NULL_IF_CONFIG_SMALL("PHQM: Calculate the Perceptual Hash Hamming Difference between two video streams."),
+ .preinit = phqm_framesync_preinit,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .activate = activate,
+ .priv_size = sizeof(PHQMContext),
+ .priv_class = &phqm_class,
+ .inputs = phqm_inputs,
+ .outputs = phqm_outputs,
+};
--
2.20.1
More information about the ffmpeg-devel
mailing list