avformat/matroskadec: do not trust the default duration to be the real 1/timebase if its less than 5fps
Fixes Ticket3980 Signed-off-by: Michael Niedermayer <michaelni@gmx.at> (cherry picked from commit be695ee389724d713e1b8a61ef899fe1795193ce)
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@ -1979,7 +1979,8 @@ static int matroska_parse_tracks(AVFormatContext *s)
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av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
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1000000000, track->default_duration, 30000);
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#if FF_API_R_FRAME_RATE
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if (st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L)
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if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L
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&& st->avg_frame_rate.num > st->avg_frame_rate.den * 5L)
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st->r_frame_rate = st->avg_frame_rate;
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#endif
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}
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