video upside down is a common problem when several filters interact (could not say how).
e.g. divxg400 + directVobSub or divx5 decoder filter + directVobSub when some color settings are given (both on YUV output or something like that)
sometimes it's quite tricky to find a configuration that allows you to play all your different kinds of videos the right way ;)
btw it makes me think that the difference between overlay modes could be the output color type [e.g. YV12 in mode 1 and RGB32 in mode 2, (I just put "names" randomly here, taken from DirectVobSub color configuration].
that's just an idea I've come with, not a statement ;) I don't know much about these things.
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