HACK avformat: restore old framerate logic
The new logic produces inconsistent results for field-based codecs, the old logic has been proven to work for years, so just stick to it.
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@ -2997,10 +2997,12 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
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if (!st->r_frame_rate.num) {
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const AVCodecDescriptor *desc = sti->codec_desc;
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AVRational mul = (AVRational){ desc && (desc->props & AV_CODEC_PROP_FIELDS) ? 2 : 1, 1 };
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AVRational fr = av_mul_q(avctx->framerate, mul);
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AVRational time_base = av_inv_q(av_mul_q(avctx->framerate, mul));
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if (fr.num && fr.den && av_cmp_q(st->time_base, av_inv_q(fr)) <= 0) {
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st->r_frame_rate = fr;
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if ( time_base.den * (int64_t) st->time_base.num
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<= time_base.num * (uint64_t)mul.num * st->time_base.den) {
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av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
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time_base.den, (int64_t)time_base.num * mul.num, INT_MAX);
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} else {
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st->r_frame_rate.num = st->time_base.den;
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st->r_frame_rate.den = st->time_base.num;
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