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avfilter/vf_fps: fix rounding error accumulation 

Fixes Ticket3329

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-25 23:23:28 +01:00
parent c849b00b80
commit 8f33810ed2
1 changed files with 5 additions and 8 deletions
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13
libavfilter/vf_fps.c
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@ -45,7 +45,6 @@ typedef struct FPSContext {
/* timestamps in input timebase */
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
@ -83,7 +82,6 @@ static av_cold int init(AVFilterContext *ctx)
if (!(s->fifo = av_fifo_alloc(2*sizeof(AVFrame*))))
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);
@ -179,7 +177,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
s->frames_in++;
/* discard frames until we get the first timestamp */
if (s->pts == AV_NOPTS_VALUE) {
if (s->first_pts == AV_NOPTS_VALUE) {
if (buf->pts != AV_NOPTS_VALUE) {
ret = write_to_fifo(s->fifo, buf);
if (ret < 0)
@ -188,13 +186,13 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
if (s->start_time != DBL_MAX && 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,
s->first_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;
s->first_pts = buf->pts;
}
} else {
av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
@ -211,8 +209,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
}
/* number of output frames */
delta = av_rescale_q_rnd(buf->pts - s->pts, inlink->time_base,
outlink->time_base, s->rounding);
delta = av_rescale_q_rnd(buf->pts - s->first_pts, inlink->time_base,
outlink->time_base, s->rounding) - s->frames_out ;
if (delta < 1) {
/* drop the frame and everything buffered except the first */
@ -267,7 +265,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
flush_fifo(s->fifo);
ret = write_to_fifo(s->fifo, buf);
s->pts = s->first_pts + av_rescale_q(s->frames_out, outlink->time_base, inlink->time_base);
return ret;
}