Jeffrey Smith (@whydoubt) commented about dlls/mfmediaengine/main.c:
if (SUCCEEDED(IMFPresentationDescriptor_GetUINT64(pd, &MF_PD_DURATION, &duration))) { /* Convert 100ns to seconds. */
engine->duration = duration / 10000000;
engine->duration = (double)duration / 10000000;
Not sure if the lead devs have a preference on this one, but `= duration / 10000000.0` compiles to the same thing.
I also prefer `1e7` over `10000000.0` because that many 0's is hard to read at a glance.