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Ok, well if it occurs in mainline FFMS2, then the root cause is in the FFMS2 core, not in the plugins. Since it only occurs with fpsnum/fpsden, it probably involves one of the good handful of commits about timestamp or frame rate handling that came in over the course of 2017, although without bisecting it, I won't know for sure which one is the culprit. Likely it's specifically using fpsnum/fpsden on broken files like that, because the timestamps are already messed up.
My memory is really fuzzy involving the Haali stuff (but it doesn't matter since we know it happened in both the C++ and C plugins around the same time). The MPEG and OGG demuxers relied on the Haali DirectShow splitter, though, so I'm not sure if that was the *.dll or the *.ax file.
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