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av_reduce(&num, &den, 1, 14112000, 1000000) can return num=0, den=1. This means a 1/14112000 timebase (as used by the mp3 demuxer) would become invalid. The intention of mp_get_codec_timebase() is to always return a valid timebase. av_reduce() probably does the logically correct thing - so add a fallback to the safe default timebase. Also, increase the av_reduce() parameter to INT_MAX. Let's just pray this doesn't cause any actual problems. libavformat does the same, but might be in a different position due to using av_rescale() etc., while we convert between fractional timestamps and floats.