generic-library/ffmpeg
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try to guess the fps if they are variable

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Originally committed as revision 3760 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2004-12-19 01:23:22 +00:00
parent 0d00cf38c6
commit 15bc38e57c
3 changed files with 29 additions and 13 deletions
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23
libavformat/utils.c
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@@ -1726,7 +1726,14 @@ int av_find_stream_info(AVFormatContext *ic)
AVStream *st;
AVPacket pkt1, *pkt;
AVPacketList *pktl=NULL, **ppktl;
int64_t last_dts[MAX_STREAMS];
int64_t best_duration[MAX_STREAMS];
for(i=0;i<MAX_STREAMS;i++){
last_dts[i]= AV_NOPTS_VALUE;
best_duration[i]= INT64_MAX;
}
count = 0;
read_size = 0;
ppktl = &ic->packet_buffer;
@@ -1792,6 +1799,15 @@ int av_find_stream_info(AVFormatContext *ic)
if (pkt->duration != 0)
st->codec_info_nb_frames++;
if(st->codec.codec_type == CODEC_TYPE_VIDEO){
int64_t last= last_dts[pkt->stream_index];
if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && last < pkt->dts &&
best_duration[pkt->stream_index] > pkt->dts - last){
best_duration[pkt->stream_index] = pkt->dts - last;
}
last_dts[pkt->stream_index]= pkt->dts;
}
/* if still no information, we try to open the codec and to
decompress the frame. We try to avoid that in most cases as
it takes longer and uses more memory. For MPEG4, we need to
@@ -1823,6 +1839,13 @@ int av_find_stream_info(AVFormatContext *ic)
if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
if(st->codec.codec_id == CODEC_ID_RAWVIDEO && !st->codec.codec_tag && !st->codec.bits_per_sample)
st->codec.codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec.pix_fmt);
if(best_duration[i] < INT64_MAX && st->codec.frame_rate_base*1000 <= st->codec.frame_rate){
st->r_frame_rate= st->codec.frame_rate;
st->r_frame_rate_base= av_rescale(best_duration[i], st->codec.frame_rate, AV_TIME_BASE);
av_reduce(&st->r_frame_rate, &st->r_frame_rate_base, st->r_frame_rate, st->r_frame_rate_base, 1<<15);
}
/* set real frame rate info */
/* compute the real frame rate for telecine */
if ((st->codec.codec_id == CODEC_ID_MPEG1VIDEO ||