As documented by the man pages, xvidcap will read a default capture window size from .Xdefaults.
gvidcap fails to make use of .Xdefaults.
Karl H. Beckers
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it doesn't because GTK doesn't give a fig about X resource
I'm afraid there is no real way around that short of reimple-
menting X resource handling in xvidcap, which I'd say is
out of the question.
Don't like it either, but it seems that's just the way it is.
Therefore I'm closing this bug.