| Message ID | 20190929132515.4093-1-lance.lmwang@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
ping, please give comments. On Sun, Sep 29, 2019 at 09:25:12PM +0800, lance.lmwang@gmail.com wrote: > From: Limin Wang <lance.lmwang@gmail.com> > > Signed-off-by: Limin Wang <lance.lmwang@gmail.com> > --- > Please provide a comment to add a new filter for scene change detection to avoid > multiple calculations of mafd in the filter chain. The filter can avoid duplication > code also for I am writing a new filter to synchronize frames that require scene > change information. If the detect metadata can get, the code will be simple. > > In addition, I'm trying to add a reduced size before scene change detection to improve > the performance. From the initial test, we can only get 10-20% improvement, but some > scene change aren't detected after that. Therefore, I think that should not be done. > > This version, I removed the version change for it's easy to cause code conflict, > please the committer help to update it if review done. > > configure | 1 + > doc/filters.texi | 35 +++++ > libavfilter/Makefile | 1 + > libavfilter/allfilters.c | 1 + > libavfilter/vf_scenechangedetect.c | 220 +++++++++++++++++++++++++++++ > 5 files changed, 258 insertions(+) > create mode 100644 libavfilter/vf_scenechangedetect.c > > diff --git a/configure b/configure > index 8413826f9e..909a77b9cf 100755 > --- a/configure > +++ b/configure > @@ -3520,6 +3520,7 @@ sab_filter_deps="gpl swscale" > scale2ref_filter_deps="swscale" > scale_filter_deps="swscale" > scale_qsv_filter_deps="libmfx" > +scenechangedetect_filter_select="scene_sad" > select_filter_select="scene_sad" > sharpness_vaapi_filter_deps="vaapi" > showcqt_filter_deps="avcodec avformat swscale" > diff --git a/doc/filters.texi b/doc/filters.texi > index e6f8bf0ee9..f9247643cb 100644 > --- a/doc/filters.texi > +++ b/doc/filters.texi > @@ -15642,6 +15642,41 @@ Scale a logo to 1/10th the height of a video, while preserving its display aspec > @end example > @end itemize > > +@anchor{scenechangedetect} > +@section scenechangedetect > + > +Detect video scene change. > + > +This filter sets frame metadata with mafd between frame, the scene score, and > +forward the frame to the next filter, so they can use these metadata to detect > +scene change or others. > + > +In addition, this filter logs a message and sets frame metadata when it detects > +a scene change by @option{threshold}. > + > +@code{lavfi.scd.mafd} metadata keys are set with mafd for every frame. > + > +@code{lavfi.scd.score} metadata keys are set with scene change score for every frame > +to detect scene change. > + > +@code{lavfi.scd.time} metadata keys are set with current filtered frame time which > +detect scene change with @option{threshold}. > + > +The filter accepts the following options: > + > +@table @option > +@item threshold, t > +Set the scene change detection threshold as a percentage of maximum change. Good > +values are in the @code{[8.0, 14.0]} range. The range for @option{threshold} is > +@code{[0., 100.]}. > + > +Default value is @code{10.}. > + > +@item sc_pass, s > +Set the scene change pass the frame to the next filter or not. Default value is @code{0} > +You can enable it if you want to get snapshot of scene change frames. > +@end table > + > @anchor{selectivecolor} > @section selectivecolor > > diff --git a/libavfilter/Makefile b/libavfilter/Makefile > index b99ecc8c26..f6c6ba5d45 100644 > --- a/libavfilter/Makefile > +++ b/libavfilter/Makefile > @@ -356,6 +356,7 @@ OBJS-$(CONFIG_SCALE_NPP_FILTER) += vf_scale_npp.o scale.o > OBJS-$(CONFIG_SCALE_QSV_FILTER) += vf_scale_qsv.o > OBJS-$(CONFIG_SCALE_VAAPI_FILTER) += vf_scale_vaapi.o scale.o vaapi_vpp.o > OBJS-$(CONFIG_SCALE2REF_FILTER) += vf_scale.o scale.o > +OBJS-$(CONFIG_SCENECHANGEDETECT_FILTER) += vf_scenechangedetect.o > OBJS-$(CONFIG_SELECT_FILTER) += f_select.o > OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o > OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o > diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c > index 788652ab1e..69a4d5e8e5 100644 > --- a/libavfilter/allfilters.c > +++ b/libavfilter/allfilters.c > @@ -338,6 +338,7 @@ extern AVFilter ff_vf_scale_npp; > extern AVFilter ff_vf_scale_qsv; > extern AVFilter ff_vf_scale_vaapi; > extern AVFilter ff_vf_scale2ref; > +extern AVFilter ff_vf_scenechangedetect; > extern AVFilter ff_vf_select; > extern AVFilter ff_vf_selectivecolor; > extern AVFilter ff_vf_sendcmd; > diff --git a/libavfilter/vf_scenechangedetect.c b/libavfilter/vf_scenechangedetect.c > new file mode 100644 > index 0000000000..269fa399d0 > --- /dev/null > +++ b/libavfilter/vf_scenechangedetect.c > @@ -0,0 +1,220 @@ > +/* > + * 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 > + * video scene change detection filter > + */ > + > +#include "libavutil/avassert.h" > +#include "libavutil/imgutils.h" > +#include "libavutil/opt.h" > +#include "libavutil/pixdesc.h" > +#include "libavutil/timestamp.h" > + > +#include "avfilter.h" > +#include "filters.h" > +#include "scene_sad.h" > + > +typedef struct SceneChangeDetectContext { > + const AVClass *class; > + > + ptrdiff_t width[4]; > + ptrdiff_t height[4]; > + int nb_planes; > + int bitdepth; > + ff_scene_sad_fn sad; > + double prev_mafd; > + double scene_score; > + AVFrame *prev_picref; > + double threshold; > + int sc_pass; > +} SceneChangeDetectContext; > + > +#define OFFSET(x) offsetof(SceneChangeDetectContext, x) > +#define V AV_OPT_FLAG_VIDEO_PARAM > +#define F AV_OPT_FLAG_FILTERING_PARAM > + > +static const AVOption scenechangedetect_options[] = { > + { "threshold", "set scene change detect level", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F }, > + { "t", "set scene change detect level", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F }, > + { "sc_pass", "set scene change frame pass", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, > + { "s", "set scene change frame pass", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, > + {NULL} > +}; > + > +AVFILTER_DEFINE_CLASS(scenechangedetect); > + > +static int query_formats(AVFilterContext *ctx) > +{ > + static const enum AVPixelFormat pix_fmts[] = { > + AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA, > + AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, > + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, > + AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, > + AV_PIX_FMT_YUV420P10, > + 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 int config_input(AVFilterLink *inlink) > +{ > + AVFilterContext *ctx = inlink->dst; > + SceneChangeDetectContext *s = ctx->priv; > + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); > + int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) && > + (desc->flags & AV_PIX_FMT_FLAG_PLANAR) && > + desc->nb_components >= 3; > + > + s->bitdepth = desc->comp[0].depth; > + s->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format); > + > + for (int plane = 0; plane < 4; plane++) { > + ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane); > + s->width[plane] = line_size >> (s->bitdepth > 8); > + s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ? desc->log2_chroma_h : 0); > + } > + > + s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16); > + if (!s->sad) > + return AVERROR(EINVAL); > + > + return 0; > +} > + > +static av_cold void uninit(AVFilterContext *ctx) > +{ > + SceneChangeDetectContext *s = ctx->priv; > + > + av_frame_free(&s->prev_picref); > +} > + > +static double get_scene_score(AVFilterContext *ctx, AVFrame *frame) > +{ > + double ret = 0; > + SceneChangeDetectContext *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 = 0; > + double mafd, diff; > + uint64_t count = 0; > + > + for (int plane = 0; plane < s->nb_planes; plane++) { > + uint64_t plane_sad; > + s->sad(prev_picref->data[plane], prev_picref->linesize[plane], > + frame->data[plane], frame->linesize[plane], > + s->width[plane], s->height[plane], &plane_sad); > + sad += plane_sad; > + count += s->width[plane] * s->height[plane]; > + } > + > + emms_c(); > + mafd = (double)sad * 100. / count / (1ULL << s->bitdepth); > + diff = fabs(mafd - s->prev_mafd); > + ret = av_clipf(FFMIN(mafd, diff), 0, 100.); > + s->prev_mafd = mafd; > + av_frame_free(&prev_picref); > + } > + s->prev_picref = av_frame_clone(frame); > + return ret; > +} > + > +static int set_meta(SceneChangeDetectContext *s, AVFrame *frame, const char *key, const char *value) > +{ > + return av_dict_set(&frame->metadata, key, value, 0); > +} > + > +static int activate(AVFilterContext *ctx) > +{ > + int ret; > + AVFilterLink *inlink = ctx->inputs[0]; > + AVFilterLink *outlink = ctx->outputs[0]; > + SceneChangeDetectContext *s = ctx->priv; > + AVFrame *frame; > + > + FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); > + > + ret = ff_inlink_consume_frame(inlink, &frame); > + if (ret < 0) > + return ret; > + > + if (frame) { > + char buf[64]; > + s->scene_score = get_scene_score(ctx, frame); > + snprintf(buf, sizeof(buf), "%0.3f", s->prev_mafd); > + set_meta(s, frame, "lavfi.scd.mafd", buf); > + snprintf(buf, sizeof(buf), "%0.3f", s->scene_score); > + set_meta(s, frame, "lavfi.scd.score", buf); > + > + if (s->scene_score > s->threshold) { > + av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, lavfi.scd.time: %s\n", > + s->scene_score, av_ts2timestr(frame->pts, &inlink->time_base)); > + set_meta(s, frame, "lavfi.scd.time", > + av_ts2timestr(frame->pts, &inlink->time_base)); > + } > + if (s->sc_pass) { > + if (s->scene_score > s->threshold) > + return ff_filter_frame(outlink, frame); > + else { > + av_frame_free(&frame); > + } > + } else > + return ff_filter_frame(outlink, frame); > + } > + > + FF_FILTER_FORWARD_STATUS(inlink, outlink); > + FF_FILTER_FORWARD_WANTED(outlink, inlink); > + > + return FFERROR_NOT_READY; > +} > + > +static const AVFilterPad scenechangedetect_inputs[] = { > + { > + .name = "default", > + .type = AVMEDIA_TYPE_VIDEO, > + .config_props = config_input, > + }, > + { NULL } > +}; > + > +static const AVFilterPad scenechangedetect_outputs[] = { > + { > + .name = "default", > + .type = AVMEDIA_TYPE_VIDEO, > + }, > + { NULL } > +}; > + > +AVFilter ff_vf_scenechangedetect = { > + .name = "scenechangedetect", > + .description = NULL_IF_CONFIG_SMALL("Detect video scene change"), > + .priv_size = sizeof(SceneChangeDetectContext), > + .priv_class = &scenechangedetect_class, > + .uninit = uninit, > + .query_formats = query_formats, > + .inputs = scenechangedetect_inputs, > + .outputs = scenechangedetect_outputs, > + .activate = activate, > +}; > -- > 2.21.0 >
Too long filter name. On 10/7/19, Limin Wang <lance.lmwang@gmail.com> wrote: > > ping, please give comments. > > On Sun, Sep 29, 2019 at 09:25:12PM +0800, lance.lmwang@gmail.com wrote: >> From: Limin Wang <lance.lmwang@gmail.com> >> >> Signed-off-by: Limin Wang <lance.lmwang@gmail.com> >> --- >> Please provide a comment to add a new filter for scene change detection to >> avoid >> multiple calculations of mafd in the filter chain. The filter can avoid >> duplication >> code also for I am writing a new filter to synchronize frames that require >> scene >> change information. If the detect metadata can get, the code will be >> simple. >> >> In addition, I'm trying to add a reduced size before scene change >> detection to improve >> the performance. From the initial test, we can only get 10-20% >> improvement, but some >> scene change aren't detected after that. Therefore, I think that should >> not be done. >> >> This version, I removed the version change for it's easy to cause code >> conflict, >> please the committer help to update it if review done. >> >> configure | 1 + >> doc/filters.texi | 35 +++++ >> libavfilter/Makefile | 1 + >> libavfilter/allfilters.c | 1 + >> libavfilter/vf_scenechangedetect.c | 220 +++++++++++++++++++++++++++++ >> 5 files changed, 258 insertions(+) >> create mode 100644 libavfilter/vf_scenechangedetect.c >> >> diff --git a/configure b/configure >> index 8413826f9e..909a77b9cf 100755 >> --- a/configure >> +++ b/configure >> @@ -3520,6 +3520,7 @@ sab_filter_deps="gpl swscale" >> scale2ref_filter_deps="swscale" >> scale_filter_deps="swscale" >> scale_qsv_filter_deps="libmfx" >> +scenechangedetect_filter_select="scene_sad" >> select_filter_select="scene_sad" >> sharpness_vaapi_filter_deps="vaapi" >> showcqt_filter_deps="avcodec avformat swscale" >> diff --git a/doc/filters.texi b/doc/filters.texi >> index e6f8bf0ee9..f9247643cb 100644 >> --- a/doc/filters.texi >> +++ b/doc/filters.texi >> @@ -15642,6 +15642,41 @@ Scale a logo to 1/10th the height of a video, >> while preserving its display aspec >> @end example >> @end itemize >> >> +@anchor{scenechangedetect} >> +@section scenechangedetect >> + >> +Detect video scene change. >> + >> +This filter sets frame metadata with mafd between frame, the scene score, >> and >> +forward the frame to the next filter, so they can use these metadata to >> detect >> +scene change or others. >> + >> +In addition, this filter logs a message and sets frame metadata when it >> detects >> +a scene change by @option{threshold}. >> + >> +@code{lavfi.scd.mafd} metadata keys are set with mafd for every frame. >> + >> +@code{lavfi.scd.score} metadata keys are set with scene change score for >> every frame >> +to detect scene change. >> + >> +@code{lavfi.scd.time} metadata keys are set with current filtered frame >> time which >> +detect scene change with @option{threshold}. >> + >> +The filter accepts the following options: >> + >> +@table @option >> +@item threshold, t >> +Set the scene change detection threshold as a percentage of maximum >> change. Good >> +values are in the @code{[8.0, 14.0]} range. The range for >> @option{threshold} is >> +@code{[0., 100.]}. >> + >> +Default value is @code{10.}. >> + >> +@item sc_pass, s >> +Set the scene change pass the frame to the next filter or not. Default >> value is @code{0} >> +You can enable it if you want to get snapshot of scene change frames. >> +@end table >> + >> @anchor{selectivecolor} >> @section selectivecolor >> >> diff --git a/libavfilter/Makefile b/libavfilter/Makefile >> index b99ecc8c26..f6c6ba5d45 100644 >> --- a/libavfilter/Makefile >> +++ b/libavfilter/Makefile >> @@ -356,6 +356,7 @@ OBJS-$(CONFIG_SCALE_NPP_FILTER) += >> vf_scale_npp.o scale.o >> OBJS-$(CONFIG_SCALE_QSV_FILTER) += vf_scale_qsv.o >> OBJS-$(CONFIG_SCALE_VAAPI_FILTER) += vf_scale_vaapi.o scale.o >> vaapi_vpp.o >> OBJS-$(CONFIG_SCALE2REF_FILTER) += vf_scale.o scale.o >> +OBJS-$(CONFIG_SCENECHANGEDETECT_FILTER) += vf_scenechangedetect.o >> OBJS-$(CONFIG_SELECT_FILTER) += f_select.o >> OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o >> OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o >> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c >> index 788652ab1e..69a4d5e8e5 100644 >> --- a/libavfilter/allfilters.c >> +++ b/libavfilter/allfilters.c >> @@ -338,6 +338,7 @@ extern AVFilter ff_vf_scale_npp; >> extern AVFilter ff_vf_scale_qsv; >> extern AVFilter ff_vf_scale_vaapi; >> extern AVFilter ff_vf_scale2ref; >> +extern AVFilter ff_vf_scenechangedetect; >> extern AVFilter ff_vf_select; >> extern AVFilter ff_vf_selectivecolor; >> extern AVFilter ff_vf_sendcmd; >> diff --git a/libavfilter/vf_scenechangedetect.c >> b/libavfilter/vf_scenechangedetect.c >> new file mode 100644 >> index 0000000000..269fa399d0 >> --- /dev/null >> +++ b/libavfilter/vf_scenechangedetect.c >> @@ -0,0 +1,220 @@ >> +/* >> + * 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 >> + * video scene change detection filter >> + */ >> + >> +#include "libavutil/avassert.h" >> +#include "libavutil/imgutils.h" >> +#include "libavutil/opt.h" >> +#include "libavutil/pixdesc.h" >> +#include "libavutil/timestamp.h" >> + >> +#include "avfilter.h" >> +#include "filters.h" >> +#include "scene_sad.h" >> + >> +typedef struct SceneChangeDetectContext { >> + const AVClass *class; >> + >> + ptrdiff_t width[4]; >> + ptrdiff_t height[4]; >> + int nb_planes; >> + int bitdepth; >> + ff_scene_sad_fn sad; >> + double prev_mafd; >> + double scene_score; >> + AVFrame *prev_picref; >> + double threshold; >> + int sc_pass; >> +} SceneChangeDetectContext; >> + >> +#define OFFSET(x) offsetof(SceneChangeDetectContext, x) >> +#define V AV_OPT_FLAG_VIDEO_PARAM >> +#define F AV_OPT_FLAG_FILTERING_PARAM >> + >> +static const AVOption scenechangedetect_options[] = { >> + { "threshold", "set scene change detect level", >> OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F >> }, >> + { "t", "set scene change detect level", >> OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F >> }, >> + { "sc_pass", "set scene change frame pass", OFFSET(sc_pass), >> AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, >> + { "s", "set scene change frame pass", OFFSET(sc_pass), >> AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, >> + {NULL} >> +}; >> + >> +AVFILTER_DEFINE_CLASS(scenechangedetect); >> + >> +static int query_formats(AVFilterContext *ctx) >> +{ >> + static const enum AVPixelFormat pix_fmts[] = { >> + AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA, >> + AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, >> + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, >> + AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, >> + AV_PIX_FMT_YUV420P10, >> + 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 int config_input(AVFilterLink *inlink) >> +{ >> + AVFilterContext *ctx = inlink->dst; >> + SceneChangeDetectContext *s = ctx->priv; >> + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); >> + int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) && >> + (desc->flags & AV_PIX_FMT_FLAG_PLANAR) && >> + desc->nb_components >= 3; >> + >> + s->bitdepth = desc->comp[0].depth; >> + s->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format); >> + >> + for (int plane = 0; plane < 4; plane++) { >> + ptrdiff_t line_size = av_image_get_linesize(inlink->format, >> inlink->w, plane); >> + s->width[plane] = line_size >> (s->bitdepth > 8); >> + s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ? >> desc->log2_chroma_h : 0); >> + } >> + >> + s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16); >> + if (!s->sad) >> + return AVERROR(EINVAL); >> + >> + return 0; >> +} >> + >> +static av_cold void uninit(AVFilterContext *ctx) >> +{ >> + SceneChangeDetectContext *s = ctx->priv; >> + >> + av_frame_free(&s->prev_picref); >> +} >> + >> +static double get_scene_score(AVFilterContext *ctx, AVFrame *frame) >> +{ >> + double ret = 0; >> + SceneChangeDetectContext *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 = 0; >> + double mafd, diff; >> + uint64_t count = 0; >> + >> + for (int plane = 0; plane < s->nb_planes; plane++) { >> + uint64_t plane_sad; >> + s->sad(prev_picref->data[plane], >> prev_picref->linesize[plane], >> + frame->data[plane], frame->linesize[plane], >> + s->width[plane], s->height[plane], &plane_sad); >> + sad += plane_sad; >> + count += s->width[plane] * s->height[plane]; >> + } >> + >> + emms_c(); >> + mafd = (double)sad * 100. / count / (1ULL << s->bitdepth); >> + diff = fabs(mafd - s->prev_mafd); >> + ret = av_clipf(FFMIN(mafd, diff), 0, 100.); >> + s->prev_mafd = mafd; >> + av_frame_free(&prev_picref); >> + } >> + s->prev_picref = av_frame_clone(frame); >> + return ret; >> +} >> + >> +static int set_meta(SceneChangeDetectContext *s, AVFrame *frame, const >> char *key, const char *value) >> +{ >> + return av_dict_set(&frame->metadata, key, value, 0); >> +} >> + >> +static int activate(AVFilterContext *ctx) >> +{ >> + int ret; >> + AVFilterLink *inlink = ctx->inputs[0]; >> + AVFilterLink *outlink = ctx->outputs[0]; >> + SceneChangeDetectContext *s = ctx->priv; >> + AVFrame *frame; >> + >> + FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); >> + >> + ret = ff_inlink_consume_frame(inlink, &frame); >> + if (ret < 0) >> + return ret; >> + >> + if (frame) { >> + char buf[64]; >> + s->scene_score = get_scene_score(ctx, frame); >> + snprintf(buf, sizeof(buf), "%0.3f", s->prev_mafd); >> + set_meta(s, frame, "lavfi.scd.mafd", buf); >> + snprintf(buf, sizeof(buf), "%0.3f", s->scene_score); >> + set_meta(s, frame, "lavfi.scd.score", buf); >> + >> + if (s->scene_score > s->threshold) { >> + av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, >> lavfi.scd.time: %s\n", >> + s->scene_score, av_ts2timestr(frame->pts, >> &inlink->time_base)); >> + set_meta(s, frame, "lavfi.scd.time", >> + av_ts2timestr(frame->pts, &inlink->time_base)); >> + } >> + if (s->sc_pass) { >> + if (s->scene_score > s->threshold) >> + return ff_filter_frame(outlink, frame); >> + else { >> + av_frame_free(&frame); >> + } >> + } else >> + return ff_filter_frame(outlink, frame); >> + } >> + >> + FF_FILTER_FORWARD_STATUS(inlink, outlink); >> + FF_FILTER_FORWARD_WANTED(outlink, inlink); >> + >> + return FFERROR_NOT_READY; >> +} >> + >> +static const AVFilterPad scenechangedetect_inputs[] = { >> + { >> + .name = "default", >> + .type = AVMEDIA_TYPE_VIDEO, >> + .config_props = config_input, >> + }, >> + { NULL } >> +}; >> + >> +static const AVFilterPad scenechangedetect_outputs[] = { >> + { >> + .name = "default", >> + .type = AVMEDIA_TYPE_VIDEO, >> + }, >> + { NULL } >> +}; >> + >> +AVFilter ff_vf_scenechangedetect = { >> + .name = "scenechangedetect", >> + .description = NULL_IF_CONFIG_SMALL("Detect video scene change"), >> + .priv_size = sizeof(SceneChangeDetectContext), >> + .priv_class = &scenechangedetect_class, >> + .uninit = uninit, >> + .query_formats = query_formats, >> + .inputs = scenechangedetect_inputs, >> + .outputs = scenechangedetect_outputs, >> + .activate = activate, >> +}; >> -- >> 2.21.0 >> > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
On Mon, Oct 07, 2019 at 09:00:10PM +0200, Paul B Mahol wrote: > Too long filter name. Yes, the name is too long, how about to use scdetect? If it's OK, I'll update the patch. > > On 10/7/19, Limin Wang <lance.lmwang@gmail.com> wrote: > > > > ping, please give comments. > > > > On Sun, Sep 29, 2019 at 09:25:12PM +0800, lance.lmwang@gmail.com wrote: > >> From: Limin Wang <lance.lmwang@gmail.com> > >> > >> Signed-off-by: Limin Wang <lance.lmwang@gmail.com> > >> --- > >> Please provide a comment to add a new filter for scene change detection to > >> avoid > >> multiple calculations of mafd in the filter chain. The filter can avoid > >> duplication > >> code also for I am writing a new filter to synchronize frames that require > >> scene > >> change information. If the detect metadata can get, the code will be > >> simple. > >> > >> In addition, I'm trying to add a reduced size before scene change > >> detection to improve > >> the performance. From the initial test, we can only get 10-20% > >> improvement, but some > >> scene change aren't detected after that. Therefore, I think that should > >> not be done. > >> > >> This version, I removed the version change for it's easy to cause code > >> conflict, > >> please the committer help to update it if review done. > >> > >> configure | 1 + > >> doc/filters.texi | 35 +++++ > >> libavfilter/Makefile | 1 + > >> libavfilter/allfilters.c | 1 + > >> libavfilter/vf_scenechangedetect.c | 220 +++++++++++++++++++++++++++++ > >> 5 files changed, 258 insertions(+) > >> create mode 100644 libavfilter/vf_scenechangedetect.c > >> > >> diff --git a/configure b/configure > >> index 8413826f9e..909a77b9cf 100755 > >> --- a/configure > >> +++ b/configure > >> @@ -3520,6 +3520,7 @@ sab_filter_deps="gpl swscale" > >> scale2ref_filter_deps="swscale" > >> scale_filter_deps="swscale" > >> scale_qsv_filter_deps="libmfx" > >> +scenechangedetect_filter_select="scene_sad" > >> select_filter_select="scene_sad" > >> sharpness_vaapi_filter_deps="vaapi" > >> showcqt_filter_deps="avcodec avformat swscale" > >> diff --git a/doc/filters.texi b/doc/filters.texi > >> index e6f8bf0ee9..f9247643cb 100644 > >> --- a/doc/filters.texi > >> +++ b/doc/filters.texi > >> @@ -15642,6 +15642,41 @@ Scale a logo to 1/10th the height of a video, > >> while preserving its display aspec > >> @end example > >> @end itemize > >> > >> +@anchor{scenechangedetect} > >> +@section scenechangedetect > >> + > >> +Detect video scene change. > >> + > >> +This filter sets frame metadata with mafd between frame, the scene score, > >> and > >> +forward the frame to the next filter, so they can use these metadata to > >> detect > >> +scene change or others. > >> + > >> +In addition, this filter logs a message and sets frame metadata when it > >> detects > >> +a scene change by @option{threshold}. > >> + > >> +@code{lavfi.scd.mafd} metadata keys are set with mafd for every frame. > >> + > >> +@code{lavfi.scd.score} metadata keys are set with scene change score for > >> every frame > >> +to detect scene change. > >> + > >> +@code{lavfi.scd.time} metadata keys are set with current filtered frame > >> time which > >> +detect scene change with @option{threshold}. > >> + > >> +The filter accepts the following options: > >> + > >> +@table @option > >> +@item threshold, t > >> +Set the scene change detection threshold as a percentage of maximum > >> change. Good > >> +values are in the @code{[8.0, 14.0]} range. The range for > >> @option{threshold} is > >> +@code{[0., 100.]}. > >> + > >> +Default value is @code{10.}. > >> + > >> +@item sc_pass, s > >> +Set the scene change pass the frame to the next filter or not. Default > >> value is @code{0} > >> +You can enable it if you want to get snapshot of scene change frames. > >> +@end table > >> + > >> @anchor{selectivecolor} > >> @section selectivecolor > >> > >> diff --git a/libavfilter/Makefile b/libavfilter/Makefile > >> index b99ecc8c26..f6c6ba5d45 100644 > >> --- a/libavfilter/Makefile > >> +++ b/libavfilter/Makefile > >> @@ -356,6 +356,7 @@ OBJS-$(CONFIG_SCALE_NPP_FILTER) += > >> vf_scale_npp.o scale.o > >> OBJS-$(CONFIG_SCALE_QSV_FILTER) += vf_scale_qsv.o > >> OBJS-$(CONFIG_SCALE_VAAPI_FILTER) += vf_scale_vaapi.o scale.o > >> vaapi_vpp.o > >> OBJS-$(CONFIG_SCALE2REF_FILTER) += vf_scale.o scale.o > >> +OBJS-$(CONFIG_SCENECHANGEDETECT_FILTER) += vf_scenechangedetect.o > >> OBJS-$(CONFIG_SELECT_FILTER) += f_select.o > >> OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o > >> OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o > >> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c > >> index 788652ab1e..69a4d5e8e5 100644 > >> --- a/libavfilter/allfilters.c > >> +++ b/libavfilter/allfilters.c > >> @@ -338,6 +338,7 @@ extern AVFilter ff_vf_scale_npp; > >> extern AVFilter ff_vf_scale_qsv; > >> extern AVFilter ff_vf_scale_vaapi; > >> extern AVFilter ff_vf_scale2ref; > >> +extern AVFilter ff_vf_scenechangedetect; > >> extern AVFilter ff_vf_select; > >> extern AVFilter ff_vf_selectivecolor; > >> extern AVFilter ff_vf_sendcmd; > >> diff --git a/libavfilter/vf_scenechangedetect.c > >> b/libavfilter/vf_scenechangedetect.c > >> new file mode 100644 > >> index 0000000000..269fa399d0 > >> --- /dev/null > >> +++ b/libavfilter/vf_scenechangedetect.c > >> @@ -0,0 +1,220 @@ > >> +/* > >> + * 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 > >> + * video scene change detection filter > >> + */ > >> + > >> +#include "libavutil/avassert.h" > >> +#include "libavutil/imgutils.h" > >> +#include "libavutil/opt.h" > >> +#include "libavutil/pixdesc.h" > >> +#include "libavutil/timestamp.h" > >> + > >> +#include "avfilter.h" > >> +#include "filters.h" > >> +#include "scene_sad.h" > >> + > >> +typedef struct SceneChangeDetectContext { > >> + const AVClass *class; > >> + > >> + ptrdiff_t width[4]; > >> + ptrdiff_t height[4]; > >> + int nb_planes; > >> + int bitdepth; > >> + ff_scene_sad_fn sad; > >> + double prev_mafd; > >> + double scene_score; > >> + AVFrame *prev_picref; > >> + double threshold; > >> + int sc_pass; > >> +} SceneChangeDetectContext; > >> + > >> +#define OFFSET(x) offsetof(SceneChangeDetectContext, x) > >> +#define V AV_OPT_FLAG_VIDEO_PARAM > >> +#define F AV_OPT_FLAG_FILTERING_PARAM > >> + > >> +static const AVOption scenechangedetect_options[] = { > >> + { "threshold", "set scene change detect level", > >> OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F > >> }, > >> + { "t", "set scene change detect level", > >> OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F > >> }, > >> + { "sc_pass", "set scene change frame pass", OFFSET(sc_pass), > >> AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, > >> + { "s", "set scene change frame pass", OFFSET(sc_pass), > >> AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, > >> + {NULL} > >> +}; > >> + > >> +AVFILTER_DEFINE_CLASS(scenechangedetect); > >> + > >> +static int query_formats(AVFilterContext *ctx) > >> +{ > >> + static const enum AVPixelFormat pix_fmts[] = { > >> + AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA, > >> + AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, > >> + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, > >> + AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, > >> + AV_PIX_FMT_YUV420P10, > >> + 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 int config_input(AVFilterLink *inlink) > >> +{ > >> + AVFilterContext *ctx = inlink->dst; > >> + SceneChangeDetectContext *s = ctx->priv; > >> + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); > >> + int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) && > >> + (desc->flags & AV_PIX_FMT_FLAG_PLANAR) && > >> + desc->nb_components >= 3; > >> + > >> + s->bitdepth = desc->comp[0].depth; > >> + s->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format); > >> + > >> + for (int plane = 0; plane < 4; plane++) { > >> + ptrdiff_t line_size = av_image_get_linesize(inlink->format, > >> inlink->w, plane); > >> + s->width[plane] = line_size >> (s->bitdepth > 8); > >> + s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ? > >> desc->log2_chroma_h : 0); > >> + } > >> + > >> + s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16); > >> + if (!s->sad) > >> + return AVERROR(EINVAL); > >> + > >> + return 0; > >> +} > >> + > >> +static av_cold void uninit(AVFilterContext *ctx) > >> +{ > >> + SceneChangeDetectContext *s = ctx->priv; > >> + > >> + av_frame_free(&s->prev_picref); > >> +} > >> + > >> +static double get_scene_score(AVFilterContext *ctx, AVFrame *frame) > >> +{ > >> + double ret = 0; > >> + SceneChangeDetectContext *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 = 0; > >> + double mafd, diff; > >> + uint64_t count = 0; > >> + > >> + for (int plane = 0; plane < s->nb_planes; plane++) { > >> + uint64_t plane_sad; > >> + s->sad(prev_picref->data[plane], > >> prev_picref->linesize[plane], > >> + frame->data[plane], frame->linesize[plane], > >> + s->width[plane], s->height[plane], &plane_sad); > >> + sad += plane_sad; > >> + count += s->width[plane] * s->height[plane]; > >> + } > >> + > >> + emms_c(); > >> + mafd = (double)sad * 100. / count / (1ULL << s->bitdepth); > >> + diff = fabs(mafd - s->prev_mafd); > >> + ret = av_clipf(FFMIN(mafd, diff), 0, 100.); > >> + s->prev_mafd = mafd; > >> + av_frame_free(&prev_picref); > >> + } > >> + s->prev_picref = av_frame_clone(frame); > >> + return ret; > >> +} > >> + > >> +static int set_meta(SceneChangeDetectContext *s, AVFrame *frame, const > >> char *key, const char *value) > >> +{ > >> + return av_dict_set(&frame->metadata, key, value, 0); > >> +} > >> + > >> +static int activate(AVFilterContext *ctx) > >> +{ > >> + int ret; > >> + AVFilterLink *inlink = ctx->inputs[0]; > >> + AVFilterLink *outlink = ctx->outputs[0]; > >> + SceneChangeDetectContext *s = ctx->priv; > >> + AVFrame *frame; > >> + > >> + FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); > >> + > >> + ret = ff_inlink_consume_frame(inlink, &frame); > >> + if (ret < 0) > >> + return ret; > >> + > >> + if (frame) { > >> + char buf[64]; > >> + s->scene_score = get_scene_score(ctx, frame); > >> + snprintf(buf, sizeof(buf), "%0.3f", s->prev_mafd); > >> + set_meta(s, frame, "lavfi.scd.mafd", buf); > >> + snprintf(buf, sizeof(buf), "%0.3f", s->scene_score); > >> + set_meta(s, frame, "lavfi.scd.score", buf); > >> + > >> + if (s->scene_score > s->threshold) { > >> + av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, > >> lavfi.scd.time: %s\n", > >> + s->scene_score, av_ts2timestr(frame->pts, > >> &inlink->time_base)); > >> + set_meta(s, frame, "lavfi.scd.time", > >> + av_ts2timestr(frame->pts, &inlink->time_base)); > >> + } > >> + if (s->sc_pass) { > >> + if (s->scene_score > s->threshold) > >> + return ff_filter_frame(outlink, frame); > >> + else { > >> + av_frame_free(&frame); > >> + } > >> + } else > >> + return ff_filter_frame(outlink, frame); > >> + } > >> + > >> + FF_FILTER_FORWARD_STATUS(inlink, outlink); > >> + FF_FILTER_FORWARD_WANTED(outlink, inlink); > >> + > >> + return FFERROR_NOT_READY; > >> +} > >> + > >> +static const AVFilterPad scenechangedetect_inputs[] = { > >> + { > >> + .name = "default", > >> + .type = AVMEDIA_TYPE_VIDEO, > >> + .config_props = config_input, > >> + }, > >> + { NULL } > >> +}; > >> + > >> +static const AVFilterPad scenechangedetect_outputs[] = { > >> + { > >> + .name = "default", > >> + .type = AVMEDIA_TYPE_VIDEO, > >> + }, > >> + { NULL } > >> +}; > >> + > >> +AVFilter ff_vf_scenechangedetect = { > >> + .name = "scenechangedetect", > >> + .description = NULL_IF_CONFIG_SMALL("Detect video scene change"), > >> + .priv_size = sizeof(SceneChangeDetectContext), > >> + .priv_class = &scenechangedetect_class, > >> + .uninit = uninit, > >> + .query_formats = query_formats, > >> + .inputs = scenechangedetect_inputs, > >> + .outputs = scenechangedetect_outputs, > >> + .activate = activate, > >> +}; > >> -- > >> 2.21.0 > >> > > _______________________________________________ > > ffmpeg-devel mailing list > > ffmpeg-devel@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > > > To unsubscribe, visit link above, or email > > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
On 10/8/19, Limin Wang <lance.lmwang@gmail.com> wrote: > On Mon, Oct 07, 2019 at 09:00:10PM +0200, Paul B Mahol wrote: > >> Too long filter name. > Yes, the name is too long, how about to use scdetect? If it's OK, I'll > update the patch. Just scdet. > >> >> On 10/7/19, Limin Wang <lance.lmwang@gmail.com> wrote: >> > >> > ping, please give comments. >> > >> > On Sun, Sep 29, 2019 at 09:25:12PM +0800, lance.lmwang@gmail.com wrote: >> >> From: Limin Wang <lance.lmwang@gmail.com> >> >> >> >> Signed-off-by: Limin Wang <lance.lmwang@gmail.com> >> >> --- >> >> Please provide a comment to add a new filter for scene change detection >> >> to >> >> avoid >> >> multiple calculations of mafd in the filter chain. The filter can avoid >> >> duplication >> >> code also for I am writing a new filter to synchronize frames that >> >> require >> >> scene >> >> change information. If the detect metadata can get, the code will be >> >> simple. >> >> >> >> In addition, I'm trying to add a reduced size before scene change >> >> detection to improve >> >> the performance. From the initial test, we can only get 10-20% >> >> improvement, but some >> >> scene change aren't detected after that. Therefore, I think that should >> >> not be done. >> >> >> >> This version, I removed the version change for it's easy to cause code >> >> conflict, >> >> please the committer help to update it if review done. >> >> >> >> configure | 1 + >> >> doc/filters.texi | 35 +++++ >> >> libavfilter/Makefile | 1 + >> >> libavfilter/allfilters.c | 1 + >> >> libavfilter/vf_scenechangedetect.c | 220 +++++++++++++++++++++++++++++ >> >> 5 files changed, 258 insertions(+) >> >> create mode 100644 libavfilter/vf_scenechangedetect.c >> >> >> >> diff --git a/configure b/configure >> >> index 8413826f9e..909a77b9cf 100755 >> >> --- a/configure >> >> +++ b/configure >> >> @@ -3520,6 +3520,7 @@ sab_filter_deps="gpl swscale" >> >> scale2ref_filter_deps="swscale" >> >> scale_filter_deps="swscale" >> >> scale_qsv_filter_deps="libmfx" >> >> +scenechangedetect_filter_select="scene_sad" >> >> select_filter_select="scene_sad" >> >> sharpness_vaapi_filter_deps="vaapi" >> >> showcqt_filter_deps="avcodec avformat swscale" >> >> diff --git a/doc/filters.texi b/doc/filters.texi >> >> index e6f8bf0ee9..f9247643cb 100644 >> >> --- a/doc/filters.texi >> >> +++ b/doc/filters.texi >> >> @@ -15642,6 +15642,41 @@ Scale a logo to 1/10th the height of a video, >> >> while preserving its display aspec >> >> @end example >> >> @end itemize >> >> >> >> +@anchor{scenechangedetect} >> >> +@section scenechangedetect >> >> + >> >> +Detect video scene change. >> >> + >> >> +This filter sets frame metadata with mafd between frame, the scene >> >> score, >> >> and >> >> +forward the frame to the next filter, so they can use these metadata >> >> to >> >> detect >> >> +scene change or others. >> >> + >> >> +In addition, this filter logs a message and sets frame metadata when >> >> it >> >> detects >> >> +a scene change by @option{threshold}. >> >> + >> >> +@code{lavfi.scd.mafd} metadata keys are set with mafd for every frame. >> >> + >> >> +@code{lavfi.scd.score} metadata keys are set with scene change score >> >> for >> >> every frame >> >> +to detect scene change. >> >> + >> >> +@code{lavfi.scd.time} metadata keys are set with current filtered >> >> frame >> >> time which >> >> +detect scene change with @option{threshold}. >> >> + >> >> +The filter accepts the following options: >> >> + >> >> +@table @option >> >> +@item threshold, t >> >> +Set the scene change detection threshold as a percentage of maximum >> >> change. Good >> >> +values are in the @code{[8.0, 14.0]} range. The range for >> >> @option{threshold} is >> >> +@code{[0., 100.]}. >> >> + >> >> +Default value is @code{10.}. >> >> + >> >> +@item sc_pass, s >> >> +Set the scene change pass the frame to the next filter or not. Default >> >> value is @code{0} >> >> +You can enable it if you want to get snapshot of scene change frames. >> >> +@end table >> >> + >> >> @anchor{selectivecolor} >> >> @section selectivecolor >> >> >> >> diff --git a/libavfilter/Makefile b/libavfilter/Makefile >> >> index b99ecc8c26..f6c6ba5d45 100644 >> >> --- a/libavfilter/Makefile >> >> +++ b/libavfilter/Makefile >> >> @@ -356,6 +356,7 @@ OBJS-$(CONFIG_SCALE_NPP_FILTER) += >> >> vf_scale_npp.o scale.o >> >> OBJS-$(CONFIG_SCALE_QSV_FILTER) += vf_scale_qsv.o >> >> OBJS-$(CONFIG_SCALE_VAAPI_FILTER) += vf_scale_vaapi.o >> >> scale.o >> >> vaapi_vpp.o >> >> OBJS-$(CONFIG_SCALE2REF_FILTER) += vf_scale.o scale.o >> >> +OBJS-$(CONFIG_SCENECHANGEDETECT_FILTER) += vf_scenechangedetect.o >> >> OBJS-$(CONFIG_SELECT_FILTER) += f_select.o >> >> OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o >> >> OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o >> >> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c >> >> index 788652ab1e..69a4d5e8e5 100644 >> >> --- a/libavfilter/allfilters.c >> >> +++ b/libavfilter/allfilters.c >> >> @@ -338,6 +338,7 @@ extern AVFilter ff_vf_scale_npp; >> >> extern AVFilter ff_vf_scale_qsv; >> >> extern AVFilter ff_vf_scale_vaapi; >> >> extern AVFilter ff_vf_scale2ref; >> >> +extern AVFilter ff_vf_scenechangedetect; >> >> extern AVFilter ff_vf_select; >> >> extern AVFilter ff_vf_selectivecolor; >> >> extern AVFilter ff_vf_sendcmd; >> >> diff --git a/libavfilter/vf_scenechangedetect.c >> >> b/libavfilter/vf_scenechangedetect.c >> >> new file mode 100644 >> >> index 0000000000..269fa399d0 >> >> --- /dev/null >> >> +++ b/libavfilter/vf_scenechangedetect.c >> >> @@ -0,0 +1,220 @@ >> >> +/* >> >> + * 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 >> >> + * video scene change detection filter >> >> + */ >> >> + >> >> +#include "libavutil/avassert.h" >> >> +#include "libavutil/imgutils.h" >> >> +#include "libavutil/opt.h" >> >> +#include "libavutil/pixdesc.h" >> >> +#include "libavutil/timestamp.h" >> >> + >> >> +#include "avfilter.h" >> >> +#include "filters.h" >> >> +#include "scene_sad.h" >> >> + >> >> +typedef struct SceneChangeDetectContext { >> >> + const AVClass *class; >> >> + >> >> + ptrdiff_t width[4]; >> >> + ptrdiff_t height[4]; >> >> + int nb_planes; >> >> + int bitdepth; >> >> + ff_scene_sad_fn sad; >> >> + double prev_mafd; >> >> + double scene_score; >> >> + AVFrame *prev_picref; >> >> + double threshold; >> >> + int sc_pass; >> >> +} SceneChangeDetectContext; >> >> + >> >> +#define OFFSET(x) offsetof(SceneChangeDetectContext, x) >> >> +#define V AV_OPT_FLAG_VIDEO_PARAM >> >> +#define F AV_OPT_FLAG_FILTERING_PARAM >> >> + >> >> +static const AVOption scenechangedetect_options[] = { >> >> + { "threshold", "set scene change detect level", >> >> OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., >> >> V|F >> >> }, >> >> + { "t", "set scene change detect level", >> >> OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., >> >> V|F >> >> }, >> >> + { "sc_pass", "set scene change frame pass", >> >> OFFSET(sc_pass), >> >> AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, >> >> + { "s", "set scene change frame pass", >> >> OFFSET(sc_pass), >> >> AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, >> >> + {NULL} >> >> +}; >> >> + >> >> +AVFILTER_DEFINE_CLASS(scenechangedetect); >> >> + >> >> +static int query_formats(AVFilterContext *ctx) >> >> +{ >> >> + static const enum AVPixelFormat pix_fmts[] = { >> >> + AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA, >> >> + AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, >> >> + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, >> >> + AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, >> >> + AV_PIX_FMT_YUV420P10, >> >> + 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 int config_input(AVFilterLink *inlink) >> >> +{ >> >> + AVFilterContext *ctx = inlink->dst; >> >> + SceneChangeDetectContext *s = ctx->priv; >> >> + const AVPixFmtDescriptor *desc = >> >> av_pix_fmt_desc_get(inlink->format); >> >> + int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) && >> >> + (desc->flags & AV_PIX_FMT_FLAG_PLANAR) && >> >> + desc->nb_components >= 3; >> >> + >> >> + s->bitdepth = desc->comp[0].depth; >> >> + s->nb_planes = is_yuv ? 1 : >> >> av_pix_fmt_count_planes(inlink->format); >> >> + >> >> + for (int plane = 0; plane < 4; plane++) { >> >> + ptrdiff_t line_size = av_image_get_linesize(inlink->format, >> >> inlink->w, plane); >> >> + s->width[plane] = line_size >> (s->bitdepth > 8); >> >> + s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ? >> >> desc->log2_chroma_h : 0); >> >> + } >> >> + >> >> + s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16); >> >> + if (!s->sad) >> >> + return AVERROR(EINVAL); >> >> + >> >> + return 0; >> >> +} >> >> + >> >> +static av_cold void uninit(AVFilterContext *ctx) >> >> +{ >> >> + SceneChangeDetectContext *s = ctx->priv; >> >> + >> >> + av_frame_free(&s->prev_picref); >> >> +} >> >> + >> >> +static double get_scene_score(AVFilterContext *ctx, AVFrame *frame) >> >> +{ >> >> + double ret = 0; >> >> + SceneChangeDetectContext *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 = 0; >> >> + double mafd, diff; >> >> + uint64_t count = 0; >> >> + >> >> + for (int plane = 0; plane < s->nb_planes; plane++) { >> >> + uint64_t plane_sad; >> >> + s->sad(prev_picref->data[plane], >> >> prev_picref->linesize[plane], >> >> + frame->data[plane], frame->linesize[plane], >> >> + s->width[plane], s->height[plane], &plane_sad); >> >> + sad += plane_sad; >> >> + count += s->width[plane] * s->height[plane]; >> >> + } >> >> + >> >> + emms_c(); >> >> + mafd = (double)sad * 100. / count / (1ULL << s->bitdepth); >> >> + diff = fabs(mafd - s->prev_mafd); >> >> + ret = av_clipf(FFMIN(mafd, diff), 0, 100.); >> >> + s->prev_mafd = mafd; >> >> + av_frame_free(&prev_picref); >> >> + } >> >> + s->prev_picref = av_frame_clone(frame); >> >> + return ret; >> >> +} >> >> + >> >> +static int set_meta(SceneChangeDetectContext *s, AVFrame *frame, const >> >> char *key, const char *value) >> >> +{ >> >> + return av_dict_set(&frame->metadata, key, value, 0); >> >> +} >> >> + >> >> +static int activate(AVFilterContext *ctx) >> >> +{ >> >> + int ret; >> >> + AVFilterLink *inlink = ctx->inputs[0]; >> >> + AVFilterLink *outlink = ctx->outputs[0]; >> >> + SceneChangeDetectContext *s = ctx->priv; >> >> + AVFrame *frame; >> >> + >> >> + FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); >> >> + >> >> + ret = ff_inlink_consume_frame(inlink, &frame); >> >> + if (ret < 0) >> >> + return ret; >> >> + >> >> + if (frame) { >> >> + char buf[64]; >> >> + s->scene_score = get_scene_score(ctx, frame); >> >> + snprintf(buf, sizeof(buf), "%0.3f", s->prev_mafd); >> >> + set_meta(s, frame, "lavfi.scd.mafd", buf); >> >> + snprintf(buf, sizeof(buf), "%0.3f", s->scene_score); >> >> + set_meta(s, frame, "lavfi.scd.score", buf); >> >> + >> >> + if (s->scene_score > s->threshold) { >> >> + av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, >> >> lavfi.scd.time: %s\n", >> >> + s->scene_score, av_ts2timestr(frame->pts, >> >> &inlink->time_base)); >> >> + set_meta(s, frame, "lavfi.scd.time", >> >> + av_ts2timestr(frame->pts, &inlink->time_base)); >> >> + } >> >> + if (s->sc_pass) { >> >> + if (s->scene_score > s->threshold) >> >> + return ff_filter_frame(outlink, frame); >> >> + else { >> >> + av_frame_free(&frame); >> >> + } >> >> + } else >> >> + return ff_filter_frame(outlink, frame); >> >> + } >> >> + >> >> + FF_FILTER_FORWARD_STATUS(inlink, outlink); >> >> + FF_FILTER_FORWARD_WANTED(outlink, inlink); >> >> + >> >> + return FFERROR_NOT_READY; >> >> +} >> >> + >> >> +static const AVFilterPad scenechangedetect_inputs[] = { >> >> + { >> >> + .name = "default", >> >> + .type = AVMEDIA_TYPE_VIDEO, >> >> + .config_props = config_input, >> >> + }, >> >> + { NULL } >> >> +}; >> >> + >> >> +static const AVFilterPad scenechangedetect_outputs[] = { >> >> + { >> >> + .name = "default", >> >> + .type = AVMEDIA_TYPE_VIDEO, >> >> + }, >> >> + { NULL } >> >> +}; >> >> + >> >> +AVFilter ff_vf_scenechangedetect = { >> >> + .name = "scenechangedetect", >> >> + .description = NULL_IF_CONFIG_SMALL("Detect video scene >> >> change"), >> >> + .priv_size = sizeof(SceneChangeDetectContext), >> >> + .priv_class = &scenechangedetect_class, >> >> + .uninit = uninit, >> >> + .query_formats = query_formats, >> >> + .inputs = scenechangedetect_inputs, >> >> + .outputs = scenechangedetect_outputs, >> >> + .activate = activate, >> >> +}; >> >> -- >> >> 2.21.0 >> >> >> > _______________________________________________ >> > ffmpeg-devel mailing list >> > ffmpeg-devel@ffmpeg.org >> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> > >> > To unsubscribe, visit link above, or email >> > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". >> _______________________________________________ >> ffmpeg-devel mailing list >> ffmpeg-devel@ffmpeg.org >> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> >> To unsubscribe, visit link above, or email >> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
diff --git a/configure b/configure index 8413826f9e..909a77b9cf 100755 --- a/configure +++ b/configure @@ -3520,6 +3520,7 @@ sab_filter_deps="gpl swscale" scale2ref_filter_deps="swscale" scale_filter_deps="swscale" scale_qsv_filter_deps="libmfx" +scenechangedetect_filter_select="scene_sad" select_filter_select="scene_sad" sharpness_vaapi_filter_deps="vaapi" showcqt_filter_deps="avcodec avformat swscale" diff --git a/doc/filters.texi b/doc/filters.texi index e6f8bf0ee9..f9247643cb 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -15642,6 +15642,41 @@ Scale a logo to 1/10th the height of a video, while preserving its display aspec @end example @end itemize +@anchor{scenechangedetect} +@section scenechangedetect + +Detect video scene change. + +This filter sets frame metadata with mafd between frame, the scene score, and +forward the frame to the next filter, so they can use these metadata to detect +scene change or others. + +In addition, this filter logs a message and sets frame metadata when it detects +a scene change by @option{threshold}. + +@code{lavfi.scd.mafd} metadata keys are set with mafd for every frame. + +@code{lavfi.scd.score} metadata keys are set with scene change score for every frame +to detect scene change. + +@code{lavfi.scd.time} metadata keys are set with current filtered frame time which +detect scene change with @option{threshold}. + +The filter accepts the following options: + +@table @option +@item threshold, t +Set the scene change detection threshold as a percentage of maximum change. Good +values are in the @code{[8.0, 14.0]} range. The range for @option{threshold} is +@code{[0., 100.]}. + +Default value is @code{10.}. + +@item sc_pass, s +Set the scene change pass the frame to the next filter or not. Default value is @code{0} +You can enable it if you want to get snapshot of scene change frames. +@end table + @anchor{selectivecolor} @section selectivecolor diff --git a/libavfilter/Makefile b/libavfilter/Makefile index b99ecc8c26..f6c6ba5d45 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -356,6 +356,7 @@ OBJS-$(CONFIG_SCALE_NPP_FILTER) += vf_scale_npp.o scale.o OBJS-$(CONFIG_SCALE_QSV_FILTER) += vf_scale_qsv.o OBJS-$(CONFIG_SCALE_VAAPI_FILTER) += vf_scale_vaapi.o scale.o vaapi_vpp.o OBJS-$(CONFIG_SCALE2REF_FILTER) += vf_scale.o scale.o +OBJS-$(CONFIG_SCENECHANGEDETECT_FILTER) += vf_scenechangedetect.o OBJS-$(CONFIG_SELECT_FILTER) += f_select.o OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 788652ab1e..69a4d5e8e5 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -338,6 +338,7 @@ extern AVFilter ff_vf_scale_npp; extern AVFilter ff_vf_scale_qsv; extern AVFilter ff_vf_scale_vaapi; extern AVFilter ff_vf_scale2ref; +extern AVFilter ff_vf_scenechangedetect; extern AVFilter ff_vf_select; extern AVFilter ff_vf_selectivecolor; extern AVFilter ff_vf_sendcmd; diff --git a/libavfilter/vf_scenechangedetect.c b/libavfilter/vf_scenechangedetect.c new file mode 100644 index 0000000000..269fa399d0 --- /dev/null +++ b/libavfilter/vf_scenechangedetect.c @@ -0,0 +1,220 @@ +/* + * 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 + * video scene change detection filter + */ + +#include "libavutil/avassert.h" +#include "libavutil/imgutils.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" +#include "libavutil/timestamp.h" + +#include "avfilter.h" +#include "filters.h" +#include "scene_sad.h" + +typedef struct SceneChangeDetectContext { + const AVClass *class; + + ptrdiff_t width[4]; + ptrdiff_t height[4]; + int nb_planes; + int bitdepth; + ff_scene_sad_fn sad; + double prev_mafd; + double scene_score; + AVFrame *prev_picref; + double threshold; + int sc_pass; +} SceneChangeDetectContext; + +#define OFFSET(x) offsetof(SceneChangeDetectContext, x) +#define V AV_OPT_FLAG_VIDEO_PARAM +#define F AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption scenechangedetect_options[] = { + { "threshold", "set scene change detect level", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F }, + { "t", "set scene change detect level", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F }, + { "sc_pass", "set scene change frame pass", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, + { "s", "set scene change frame pass", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1., V|F }, + {NULL} +}; + +AVFILTER_DEFINE_CLASS(scenechangedetect); + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA, + AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, + AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, + AV_PIX_FMT_YUV420P10, + 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 int config_input(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + SceneChangeDetectContext *s = ctx->priv; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) && + (desc->flags & AV_PIX_FMT_FLAG_PLANAR) && + desc->nb_components >= 3; + + s->bitdepth = desc->comp[0].depth; + s->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format); + + for (int plane = 0; plane < 4; plane++) { + ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane); + s->width[plane] = line_size >> (s->bitdepth > 8); + s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ? desc->log2_chroma_h : 0); + } + + s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16); + if (!s->sad) + return AVERROR(EINVAL); + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + SceneChangeDetectContext *s = ctx->priv; + + av_frame_free(&s->prev_picref); +} + +static double get_scene_score(AVFilterContext *ctx, AVFrame *frame) +{ + double ret = 0; + SceneChangeDetectContext *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 = 0; + double mafd, diff; + uint64_t count = 0; + + for (int plane = 0; plane < s->nb_planes; plane++) { + uint64_t plane_sad; + s->sad(prev_picref->data[plane], prev_picref->linesize[plane], + frame->data[plane], frame->linesize[plane], + s->width[plane], s->height[plane], &plane_sad); + sad += plane_sad; + count += s->width[plane] * s->height[plane]; + } + + emms_c(); + mafd = (double)sad * 100. / count / (1ULL << s->bitdepth); + diff = fabs(mafd - s->prev_mafd); + ret = av_clipf(FFMIN(mafd, diff), 0, 100.); + s->prev_mafd = mafd; + av_frame_free(&prev_picref); + } + s->prev_picref = av_frame_clone(frame); + return ret; +} + +static int set_meta(SceneChangeDetectContext *s, AVFrame *frame, const char *key, const char *value) +{ + return av_dict_set(&frame->metadata, key, value, 0); +} + +static int activate(AVFilterContext *ctx) +{ + int ret; + AVFilterLink *inlink = ctx->inputs[0]; + AVFilterLink *outlink = ctx->outputs[0]; + SceneChangeDetectContext *s = ctx->priv; + AVFrame *frame; + + FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); + + ret = ff_inlink_consume_frame(inlink, &frame); + if (ret < 0) + return ret; + + if (frame) { + char buf[64]; + s->scene_score = get_scene_score(ctx, frame); + snprintf(buf, sizeof(buf), "%0.3f", s->prev_mafd); + set_meta(s, frame, "lavfi.scd.mafd", buf); + snprintf(buf, sizeof(buf), "%0.3f", s->scene_score); + set_meta(s, frame, "lavfi.scd.score", buf); + + if (s->scene_score > s->threshold) { + av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, lavfi.scd.time: %s\n", + s->scene_score, av_ts2timestr(frame->pts, &inlink->time_base)); + set_meta(s, frame, "lavfi.scd.time", + av_ts2timestr(frame->pts, &inlink->time_base)); + } + if (s->sc_pass) { + if (s->scene_score > s->threshold) + return ff_filter_frame(outlink, frame); + else { + av_frame_free(&frame); + } + } else + return ff_filter_frame(outlink, frame); + } + + FF_FILTER_FORWARD_STATUS(inlink, outlink); + FF_FILTER_FORWARD_WANTED(outlink, inlink); + + return FFERROR_NOT_READY; +} + +static const AVFilterPad scenechangedetect_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_input, + }, + { NULL } +}; + +static const AVFilterPad scenechangedetect_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +AVFilter ff_vf_scenechangedetect = { + .name = "scenechangedetect", + .description = NULL_IF_CONFIG_SMALL("Detect video scene change"), + .priv_size = sizeof(SceneChangeDetectContext), + .priv_class = &scenechangedetect_class, + .uninit = uninit, + .query_formats = query_formats, + .inputs = scenechangedetect_inputs, + .outputs = scenechangedetect_outputs, + .activate = activate, +};