This allows for dropping or duplication to match a particular start time.
---
libavfilter/vf_fps.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavfilter/vf_fps.c b/libavfilter/vf_fps.c
index 7f51752..704f697 100644
--- a/libavfilter/vf_fps.c
+++ b/libavfilter/vf_fps.c
@@ -54,6 +54,7 @@ typedef struct FPSContext {
#define V AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{ "fps", "A string describing desired output framerate", OFFSET(fps),
AV_OPT_TYPE_STRING, { .str = "25" }, .flags = V },
+ { "first_pts", "Assume the first PTS should be this value.",
OFFSET(first_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE}, INT64_MIN,
INT64_MAX, V|F },
{ NULL },
};
@@ -177,7 +178,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
if (ret < 0)
return ret;
- s->first_pts = s->pts = buf->pts;
+ if (s->first_pts != AV_NOPTS_VALUE)
+ s->pts = s->first_pts;
+ else
+ s->first_pts = s->pts = buf->pts;
} else {
av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
"timestamp.\n");
--
1.8.1.2
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