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Merge commit '545a0b807cf45b2bbc4c9087a297b741ce00f508'

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* commit '545a0b807cf45b2bbc4c9087a297b741ce00f508':
  vf_fps: add 'start_time' option

Conflicts:
	doc/filters.texi
	libavfilter/vf_fps.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-08-21 11:37:10 +02:00
commit b69b075ac6
2 changed files with 23 additions and 1 deletions
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8
doc/filters.texi
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@ -4166,6 +4166,14 @@ Alternatively, the options can be specified as a flat string:
See also the @ref{setpts} filter.
@item start_time
Assume the first PTS should be the given value, in seconds. This allows for
padding/trimming at the start of stream. By default, no assumption is made
about the first frame's expected PTS, so no padding or trimming is done.
For example, this could be set to 0 to pad the beginning with duplicates of
the first frame if a video stream starts after the audio stream or to trim any
frames with a negative PTS.
@subsection Examples
@itemize

16
libavfilter/vf_fps.c
View File

@ -44,6 +44,8 @@ typedef struct FPSContext {
int64_t first_pts; ///< pts of the first frame that arrived on this filter
int64_t pts; ///< pts of the first frame currently in the fifo
double start_time; ///< pts, in seconds, of the expected first frame
AVRational framerate; ///< target framerate
int rounding; ///< AVRounding method for timestamps
@ -59,6 +61,7 @@ typedef struct FPSContext {
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption fps_options[] = {
{ "fps", "A string describing desired output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, .flags = V|F },
{ "start_time", "Assume the first PTS should be this value.", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, { .dbl = AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX, V },
{ "round", "set rounding method for timestamps", OFFSET(rounding), AV_OPT_TYPE_INT, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" },
{ "zero", "round towards 0", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_ZERO }, 0, 5, V|F, "round" },
{ "inf", "round away from 0", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_INF }, 0, 5, V|F, "round" },
@ -78,6 +81,7 @@ static av_cold int init(AVFilterContext *ctx)
return AVERROR(ENOMEM);
s->pts = AV_NOPTS_VALUE;
s->first_pts = AV_NOPTS_VALUE;
av_log(ctx, AV_LOG_VERBOSE, "fps=%d/%d\n", s->framerate.num, s->framerate.den);
return 0;
@ -178,7 +182,17 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
if (ret < 0)
return ret;
s->first_pts = s->pts = buf->pts;
if (s->start_time != AV_NOPTS_VALUE) {
double first_pts = s->start_time * AV_TIME_BASE;
first_pts = FFMIN(FFMAX(first_pts, INT64_MIN), INT64_MAX);
s->first_pts = s->pts = av_rescale_q(first_pts, AV_TIME_BASE_Q,
inlink->time_base);
av_log(ctx, AV_LOG_VERBOSE, "Set first pts to (in:%"PRId64" out:%"PRId64")\n",
s->first_pts, av_rescale_q(first_pts, AV_TIME_BASE_Q,
outlink->time_base));
} else {
s->first_pts = s->pts = buf->pts;
}
} else {
av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
"timestamp.\n");