From: Anssi Hannula <anssi.hann...@iki.fi>
As per issue2629, most 23.976fps matroska H.264 files are incorrectly
detected as 24fps, as the matroska timestamps usually have only
millisecond precision.
Fix that by doubling the amount of timestamps inspected for frame rate
for streams that have coarse time base. This also fixes 29.970 detection
in matroska.
---
libavformat/utils.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 7ece078..a5bd940 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2277,12 +2277,20 @@ int av_find_stream_info(AVFormatContext *ic)
/* check if one codec still needs to be handled */
for(i=0;i<ic->nb_streams;i++) {
+ int fps_analyze_framecount = 20;
+
st = ic->streams[i];
if (!has_codec_parameters(st->codec))
break;
+ /* if the timebase is coarse (like the usual millisecond precision
+ of mkv), we need to analyze more frames to reliably arrive at
+ the correct fps */
+ if (av_q2d(st->time_base) > 0.0005)
+ fps_analyze_framecount *= 2;
/* variable fps and no guess at the real fps */
if( tb_unreliable(st->codec) && !(st->r_frame_rate.num &&
st->avg_frame_rate.num)
- && st->info->duration_count<20 && st->codec->codec_type ==
AVMEDIA_TYPE_VIDEO)
+ && st->info->duration_count < fps_analyze_framecount
+ && st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
break;
if(st->parser && st->parser->parser->split &&
!st->codec->extradata)
break;
--
1.7.4.1
_______________________________________________
libav-devel mailing list
libav-devel@libav.org
https://lists.libav.org/mailman/listinfo/libav-devel
