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improve fps guessing code 

Originally committed as revision 4929 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-02-02 20:54:41 +00:00
parent b2b77b9c23
commit 9f75260e68
1 changed files with 19 additions and 11 deletions
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30
libavformat/utils.c
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@ -1852,7 +1852,7 @@ static int try_decode_frame(AVStream *st, const uint8_t *data, int size)
*/
int av_find_stream_info(AVFormatContext *ic)
{
int i, count, ret, read_size;
int i, count, ret, read_size, j;
AVStream *st;
AVPacket pkt1, *pkt;
AVPacketList *pktl=NULL, **ppktl;
@ -1892,7 +1892,7 @@ int av_find_stream_info(AVFormatContext *ic)
if (!has_codec_parameters(st->codec))
break;
/* variable fps and no guess at the real fps */
if( st->codec->time_base.den >= 1000LL*st->codec->time_base.num
if( st->codec->time_base.den >= 101LL*st->codec->time_base.num
&& duration_count[i]<20 && st->codec->codec_type == CODEC_TYPE_VIDEO)
break;
if(st->parser && st->parser->parser->split && !st->codec->extradata)
@ -2024,19 +2024,27 @@ int av_find_stream_info(AVFormatContext *ic)
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(duration_count[i] && st->codec->time_base.num*1000LL <= st->codec->time_base.den &&
st->time_base.num*duration_sum[i]/duration_count[i]*1000LL > st->time_base.den){
AVRational fps1;
int64_t num, den;
if(duration_count[i] && st->codec->time_base.num*101LL <= st->codec->time_base.den &&
st->time_base.num*duration_sum[i]/duration_count[i]*101LL > st->time_base.den){
int64_t num, den, error, best_error;
num= st->time_base.den*duration_count[i];
den= st->time_base.num*duration_sum[i];
av_reduce(&fps1.num, &fps1.den, num*1001, den*1000, FFMAX(st->time_base.den, st->time_base.num)/4);
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, den, FFMAX(st->time_base.den, st->time_base.num)/4);
if(fps1.num < st->r_frame_rate.num && fps1.den == 1 && (fps1.num==24 || fps1.num==30)){ //FIXME better decission
st->r_frame_rate.num= fps1.num*1000;
st->r_frame_rate.den= fps1.den*1001;
best_error= INT64_MAX;
for(j=1; j<60*12; j++){
error= ABS(1001*12*num - 1001*j*den);
if(error < best_error){
best_error= error;
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, j, 12, INT_MAX);
}
}
for(j=24; j<=30; j+=6){
error= ABS(1001*12*num - 1000*12*j*den);
if(error < best_error){
best_error= error;
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, j*1000, 1001, INT_MAX);
}
}
}