---
libavformat/utils.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 677de11..5a39e16 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2480,10 +2480,28 @@ int avformat_find_stream_info(AVFormatContext *ic,
AVDictionary **options)
if (!st->avg_frame_rate.num && st->info->fps_last_dts !=
st->info->fps_first_dts) {
int64_t delta_dts = st->info->fps_last_dts -
st->info->fps_first_dts;
int delta_packets = st->info->fps_last_dts_idx -
st->info->fps_first_dts_idx;
+ int best_fps = 0;
+ double best_error = 0.01;
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
delta_packets*(int64_t)st->time_base.den,
delta_dts*(int64_t)st->time_base.num, 60000);
+
+ /* round guessed framerate to a "standard" framerate if it's
+ * within 1% of the original estimate*/
+ for (j = 1; j < MAX_STD_TIMEBASES; j++) {
+ AVRational std_fps = (AVRational){get_std_framerate(j),
12*1001};
+ double error = fabs(av_q2d(st->avg_frame_rate) /
av_q2d(std_fps) - 1);
+
+ if (error < best_error) {
+ best_error = error;
+ best_fps = std_fps.num;
+ }
+ }
+ if (best_fps) {
+ av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
+ best_fps, 12*1001, INT_MAX);
+ }
}
// the check for tb_unreliable() is not completely correct, since
this is not about handling
// a unreliable/inexact time base, but a time base that is finer
than necessary, as e.g.
--
1.7.10.4
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