Signed-off-by: Paul B Mahol <one...@gmail.com>
---
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,
+};
--
2.11.0
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