Can one use ffdshow as a decoder when watching through a capture card in?

[Milardo]

Can one use ffdshow as a decoder when watching through a capture card in virtualdub? Not capturing just preview/watching? If so, how does one do that?

[pandy]

Probably not - application must provide "tee filter" or preview functionality - this is low level functionality provided usually or trough capture driver or additional system filter like mentioned "tee".

[jagabo]

Do you specifically need to use VirtualDub? If not, you could use GraphEdit or GraphStudio to capture, pipe through ffdshow, then render to the screen.

[Milardo]

Yes I would like to use virtualdub, I'm surprised but I can't find any info on this.

[jagabo]

You can build a capture graph with GraphEdit or GraphStudio then open that as if it was an AVI file and "play" it with VirtualDub.

[Milardo]

I prefer not to use graphedit or graphstudio.

[jagabo]

VirtualDub lets you apply filters while capturing (Video -> Filter Chain) and there's an ffdshow filter available for it (ffvdub.vdf). But the preview window always shows the video before filters are applied.

[Milardo]

Does this mean i can watch through my capture card with ffdshow running, but no encoding right?

[jagabo]

No.

[Milardo]

I figured out the problem, I was using virtualdub 64 bit while running ffdshow 32 bit. So I used virtualdub 32 bit with ffdshow and now ffdshow can do the video decoding when in capture avi mode!