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ffmpeg.wasm-core
Commit 78431098 authored by Anssi Hannula's avatar Anssi Hannula Committed by Michael Niedermayer
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lavf: inspect more frames for fps when container time base is coarse 

As per issue2629, most 23.976fps matroska H.264 files are incorrectly
detected as 24fps, as the matroska timestamps usually have only
millisecond precision.

Fix that by doubling the amount of timestamps inspected for frame rate
for streams that have coarse time base. This also fixes 29.970 detection
in matroska.
Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent f3543969
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Showing with 216 additions and 208 deletions
libavformat/utils.c
View file @ 78431098
...@@ -2278,12 +2278,20 @@ int av_find_stream_info(AVFormatContext *ic) ...@@ -2278,12 +2278,20 @@ int av_find_stream_info(AVFormatContext *ic)
/* check if one codec still needs to be handled */ /* check if one codec still needs to be handled */
for(i=0;i<ic->nb_streams;i++) { for(i=0;i<ic->nb_streams;i++) {
int fps_analyze_framecount = 20;
st = ic->streams[i]; st = ic->streams[i];
if (!has_codec_parameters(st->codec)) if (!has_codec_parameters(st->codec))
break; break;
/* if the timebase is coarse (like the usual millisecond precision
of mkv), we need to analyze more frames to reliably arrive at
the correct fps */
if (av_q2d(st->time_base) > 0.0005)
fps_analyze_framecount *= 2;
/* variable fps and no guess at the real fps */ /* variable fps and no guess at the real fps */
if( tb_unreliable(st->codec) && !(st->r_frame_rate.num && st->avg_frame_rate.num) if( tb_unreliable(st->codec) && !(st->r_frame_rate.num && st->avg_frame_rate.num)
&& st->info->duration_count<20 && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) && st->info->duration_count < fps_analyze_framecount
&& st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
break; break;
if(st->parser && st->parser->parser->split && !st->codec->extradata) if(st->parser && st->parser->parser->split && !st->codec->extradata)
break; break;
......
tests/ref/fate/cscd
View file @ 78431098
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