Avisynth, Virtual dub and ffd for live keying?

[mfg]

Hi folks,

i was looking for a very long time for a way do do live keying (just as a preview) in front of a greenscreen with tools that are available for free.

And finaly i found a Setup that might work:

- using virtualdub to display video from my capture card (vdub in capture mode)
- using ffd plugin in vdub to apply avisynth filter

And now the difficult part:

- keyout the input video and put it over a picture (background in PNG)

That should work, right?

Too bad i have no idea how to write such an avisynth script. And googeling did not really made it more clear.

Can someone help me write this script?

mfg

[Wilbert]

See example with the blue background in: http://avisynth.org/mediawiki/Overlay

[mfg]

well i tried to blend a picture with the video (no chroma keying yet), but it doesnt work:

ConvertToRGB32()
ov = last
bg = ImageSource("C:\Documents and Settings\User\Desktop\videos\vdub\bg.jpg").ConvertToRGB32
overlay(ov,bg,0,0,,0.5)

I expected the video blended 50:50 with the background ...

Any ideas?

[Gavino]

overlay(ov,bg,0,0,,0.5)
That is a syntax error. Use:
overlay(ov,bg,0,0, opacity=0.5)