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| author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2009-02-27 07:56:24 +0000 |
|---|---|---|
| committer | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2009-02-27 07:56:24 +0000 |
| commit | 8514272472d51409a8f09a015cac2b478704c4c3 (patch) | |
| tree | a622e5ac9523917c45ceb6a5e4bbc408ba8924ca | |
| parent | 3797c74ba5350692122a81db62a7bf2ce152f7fc (diff) | |
| download | ffmpeg-streaming-8514272472d51409a8f09a015cac2b478704c4c3.zip ffmpeg-streaming-8514272472d51409a8f09a015cac2b478704c4c3.tar.gz | |
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
| -rw-r--r-- | libavformat/utils.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libavformat/utils.c b/libavformat/utils.c index 4d6cb70..9ae0658 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -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 ... |
