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lavf: Detect discontinuities in timestamps for framerate/analyzeduration calculation

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If the dts difference is more than 1000 times the average dts
difference, restart the analysis.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö
2012-08-11 21:24:40 +03:00
parent 30c26c2442
commit bdefe22b8e
1 changed files with 13 additions and 0 deletions
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13
libavformat/utils.c
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@@ -2393,6 +2393,19 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
st->info->fps_last_dts, st->codec_info_nb_frames, pkt->dts); st->info->fps_last_dts, st->codec_info_nb_frames, pkt->dts);
st->info->fps_first_dts = st->info->fps_last_dts = AV_NOPTS_VALUE; st->info->fps_first_dts = st->info->fps_last_dts = AV_NOPTS_VALUE;
} }
/* check for a discontinuity in dts - if the difference in dts
* is more than 1000 times the average packet duration in the sequence,
* we treat it as a discontinuity */
if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
st->info->fps_last_dts_idx > st->info->fps_first_dts_idx &&
(pkt->dts - st->info->fps_last_dts) / 1000 >
(st->info->fps_last_dts - st->info->fps_first_dts) / (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
av_log(ic, AV_LOG_WARNING, "DTS discontinuity in stream %d: "
"packet %d with DTS %"PRId64", packet %d with DTS "
"%"PRId64"\n", st->index, st->info->fps_last_dts_idx,
st->info->fps_last_dts, st->codec_info_nb_frames, pkt->dts);
st->info->fps_first_dts = st->info->fps_last_dts = AV_NOPTS_VALUE;
}
/* update stored dts values */ /* update stored dts values */
if (st->info->fps_first_dts == AV_NOPTS_VALUE) { if (st->info->fps_first_dts == AV_NOPTS_VALUE) {