I think VirtualDub 1.3c had some kind of asf capability, authors were asked to take it down by M$.
It used to be (I think) on original Doom9.org main site which is now down for some time.
1.3c source does not exist on SourceForge where 'all vd source' is supposed to exist, but you may find it by
looking for "VirtualDub_source-v1.3c.zip". [or PM me if anyone wants it].
EDIT:
Quote:
does not exist on SourceForge where 'all vd source' is supposed to exist
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https://sourceforge.net/projects/vir...irtualdub-win/