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Detect the case when the time base is exact but far finer than necessary to 

represent the time stamps, as e.g. for ipmovie.c and set a better r_frame_rate.

Originally committed as revision 17631 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-02-27 07:56:24 +00:00
parent 3797c74ba5
commit 8514272472
1 changed files with 9 additions and 0 deletions
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9
libavformat/utils.c
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@ -2006,6 +2006,7 @@ int av_find_stream_info(AVFormatContext *ic)
AVStream *st;
AVPacket pkt1, *pkt;
int64_t last_dts[MAX_STREAMS];
int64_t duration_gcd[MAX_STREAMS]={0};
int duration_count[MAX_STREAMS]={0};
double (*duration_error)[MAX_STD_TIMEBASES];
int64_t old_offset = url_ftell(ic->pb);
@ -2128,6 +2129,9 @@ int av_find_stream_info(AVFormatContext *ic)
duration_error[index][i] += error*error;
}
duration_count[index]++;
// ignore the first 4 values, they might have some random jitter
if (duration_count[index] > 3)
duration_gcd[index] = av_gcd(duration_gcd[index], duration);
}
if(last == AV_NOPTS_VALUE || duration_count[index]<=1)
last_dts[pkt->stream_index]= pkt->dts;
@ -2181,6 +2185,11 @@ int av_find_stream_info(AVFormatContext *ic)
if(st->codec->codec_id == CODEC_ID_RAWVIDEO && !st->codec->codec_tag && !st->codec->bits_per_coded_sample)
st->codec->codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
// 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.
// ipmovie.c produces.
if (tb_unreliable(st->codec) && duration_count[i] > 15 && duration_gcd[i] > 1)
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, st->time_base.den, st->time_base.num * duration_gcd[i], INT_MAX);
if(duration_count[i]
&& tb_unreliable(st->codec) /*&&
//FIXME we should not special-case MPEG-2, but this needs testing with non-MPEG-2 ...