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Wed, 20 Dec 2017 06:08:18 -0800 (PST) Received: from localhost.localdomain ([94.250.174.60]) by smtp.gmail.com with ESMTPSA id i65sm12710770wme.20.2017.12.20.06.08.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 20 Dec 2017 06:08:17 -0800 (PST) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Wed, 20 Dec 2017 15:07:34 +0100 Message-Id: <20171220140734.28661-1-onemda@gmail.com> X-Mailer: git-send-email 2.11.0 Subject: [FFmpeg-devel] [PATCH] avfilter: add vfrdet filter X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Signed-off-by: Paul B Mahol --- doc/filters.texi | 11 +++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/vf_vfrdet.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 124 insertions(+) create mode 100644 libavfilter/vf_vfrdet.c diff --git a/doc/filters.texi b/doc/filters.texi index fc912b6716..f439edc0df 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -15892,6 +15892,17 @@ For example, to vertically flip a video with @command{ffmpeg}: ffmpeg -i in.avi -vf "vflip" out.avi @end example +@section vfrdet + +Detect variable frame rate video. + +This filter tries to detect if the input is variable or constant frame rate. + +At end it will output number of frames detected as having variable delta pts, +and ones with constant delta pts. +If there was frames with variable delta, than it will also show min and max delta +encountered. + @anchor{vignette} @section vignette diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 6b06d57234..e75fc09e30 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -340,6 +340,7 @@ OBJS-$(CONFIG_USPP_FILTER) += vf_uspp.o OBJS-$(CONFIG_VAGUEDENOISER_FILTER) += vf_vaguedenoiser.o OBJS-$(CONFIG_VECTORSCOPE_FILTER) += vf_vectorscope.o OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o +OBJS-$(CONFIG_VFRDET_FILTER) += vf_vfrdet.o OBJS-$(CONFIG_VIDSTABDETECT_FILTER) += vidstabutils.o vf_vidstabdetect.o OBJS-$(CONFIG_VIDSTABTRANSFORM_FILTER) += vidstabutils.o vf_vidstabtransform.o OBJS-$(CONFIG_VIGNETTE_FILTER) += vf_vignette.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 707faad777..3023fac4c3 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -348,6 +348,7 @@ static void register_all(void) REGISTER_FILTER(VAGUEDENOISER, vaguedenoiser, vf); REGISTER_FILTER(VECTORSCOPE, vectorscope, vf); REGISTER_FILTER(VFLIP, vflip, vf); + REGISTER_FILTER(VFRDET, vfrdet, vf); REGISTER_FILTER(VIDSTABDETECT, vidstabdetect, vf); REGISTER_FILTER(VIDSTABTRANSFORM, vidstabtransform, vf); REGISTER_FILTER(VIGNETTE, vignette, vf); diff --git a/libavfilter/vf_vfrdet.c b/libavfilter/vf_vfrdet.c new file mode 100644 index 0000000000..617efeda92 --- /dev/null +++ b/libavfilter/vf_vfrdet.c @@ -0,0 +1,111 @@ +/* + * Copyright (C) 2017 Paul B Mahol + * + * 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 "libavutil/common.h" +#include "libavutil/opt.h" +#include "internal.h" + +typedef struct VFRDETContext { + const AVClass *class; + + int64_t prev_pts; + int64_t delta; + int64_t min_delta; + int64_t max_delta; + + int64_t vfr; + int64_t cfr; +} VFRDETContext; + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + VFRDETContext *s = ctx->priv; + + if (s->prev_pts != AV_NOPTS_VALUE) { + int64_t delta = in->pts - s->prev_pts; + + if (s->delta == AV_NOPTS_VALUE) { + s->delta = delta; + } + + if (s->delta != delta) { + s->vfr++; + s->delta = delta; + s->min_delta = FFMIN(delta, s->min_delta); + s->max_delta = FFMAX(delta, s->max_delta); + } else { + s->cfr++; + } + } + + s->prev_pts = in->pts; + + return ff_filter_frame(ctx->outputs[0], in); +} + +static av_cold int init(AVFilterContext *ctx) +{ + VFRDETContext *s = ctx->priv; + + s->prev_pts = AV_NOPTS_VALUE; + s->delta = AV_NOPTS_VALUE; + s->min_delta = INT64_MAX; + s->max_delta = INT64_MIN; + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + VFRDETContext *s = ctx->priv; + + av_log(ctx, AV_LOG_INFO, "VFR:%f (%ld/%ld)", s->vfr / (float)(s->vfr + s->cfr), s->vfr, s->cfr); + if (s->vfr) + av_log(ctx, AV_LOG_INFO, " min: %ld max: %ld)", s->min_delta, s->max_delta); + av_log(ctx, AV_LOG_INFO, "\n"); +} + +static const AVFilterPad vfrdet_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad vfrdet_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +AVFilter ff_vf_vfrdet = { + .name = "vfrdet", + .description = NULL_IF_CONFIG_SMALL("Variable frame rate detect filter."), + .priv_size = sizeof(VFRDETContext), + .init = init, + .uninit = uninit, + .inputs = vfrdet_inputs, + .outputs = vfrdet_outputs, +};